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library(readxl)
library(dplyr)
library(tidyr)
library(tibble)
raw_sheet <- read_excel(
  "Questionnaire_results_EN.xlsx",
  sheet = "Podatki",
  col_names = FALSE
)

raw_sheet
var_names <- raw_sheet |>
  slice(1) |>
  unlist(use.names = FALSE) |>
  as.character()

question_text <- raw_sheet |>
  slice(2) |>
  unlist(use.names = FALSE) |>
  as.character()

data_raw <- raw_sheet |>
  slice(-(1:2))

names(data_raw) <- var_names

data_raw <- data_raw |>
  mutate(respondent_id = row_number()) |>
  relocate(respondent_id)

glimpse(data_raw)
Rows: 338
Columns: 93
$ respondent_id <int> 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,…
$ Q1            <chr> "1", "1", "1", "1", "1", "1", "1", "1", "1", "1", "1", "1", "1…
$ Q2            <chr> "3", "2", "3", "2", "3", "2", "3", "3", "3", "3", "2", "2", "3…
$ Q3a           <chr> "1", "1", "1", "1", "1", "1", "1", "1", "1", "1", "1", "1", "1…
$ Q3b           <chr> "1", "1", "1", "1", "0", "1", "1", "1", "1", "1", "1", "1", "1…
$ Q3c           <chr> "1", "1", "1", "1", "1", "1", "1", "1", "1", "1", "1", "1", "1…
$ Q3d           <chr> "0", "0", "1", "0", "0", "0", "0", "0", "0", "0", "0", "0", "1…
$ Q3e           <chr> "1", "1", "1", "1", "1", "1", "1", "1", "1", "1", "1", "0", "1…
$ Q3f           <chr> "0", "0", "0", "0", "0", "0", "0", "1", "0", "0", "0", "0", "0…
$ Q3g           <chr> "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0…
$ Q3g_text      <chr> "-2", "-2", "-2", "-2", "-2", "-2", "-2", "-2", "-2", "-2", "-…
$ Q4            <chr> "3", "2", "1", "1", "2", "2", "1", "1", "4", "2", "2", "1", "2…
$ Q4_5_text     <chr> "-2", "-2", "-2", "-2", "-2", "-2", "-2", "-2", "-2", "-2", "-…
$ Q5a           <chr> "5", "7", "7", "4", "5", "7", "7", "4", "5", "5", "7", "7", "7…
$ Q5b           <chr> "5", "6", "5", "4", "2", "5", "2", "4", "4", "2", "2", "2", "1…
$ Q5c           <chr> "6", "6", "7", "6", "7", "7", "7", "4", "5", "6", "7", "7", "7…
$ Q5d           <chr> "6", "3", "5", "7", "5", "7", "7", "4", "6", "7", "6", "6", "4…
$ Q5e           <chr> "5", "5", "6", "1", "4", "5", "4", "4", "3", "1", "6", "5", "1…
$ Q6a           <chr> "6", "7", "7", "6", "5", "7", "6", "4", "4", "6", "6", "7", "7…
$ Q6b           <chr> "2", "6", "7", "4", "4", "4", "4", "4", "3", "5", "3", "4", "4…
$ Q6c           <chr> "6", "7", "7", "6", "5", "5", "3", "4", "6", "5", "5", "5", "4…
$ Q6d           <chr> "2", "7", "6", "4", "6", "6", "5", "4", "4", "6", "6", "5", "5…
$ Q6e           <chr> "5", "1", "7", "2", "3", "1", "2", "4", "4", "5", "2", "1", "1…
$ Q6f           <chr> "6", "5", "3", "4", "3", "1", "2", "4", "5", "5", "1", "1", "1…
$ Q6g           <chr> "6", "6", "7", "6", "5", "1", "4", "4", "6", "6", "5", "7", "4…
$ Q6h           <chr> "5", "7", "7", "6", "6", "6", "3", "4", "5", "6", "6", "6", "4…
$ Q6i           <chr> "3", "6", "5", "4", "4", "5", "3", "4", "4", "5", "2", "5", "4…
$ Q8a           <chr> "5", "7", "7", "1", "3", "3", "2", "4", "4", "6", "6", "3", "1…
$ Q8b           <chr> "7", "7", "6", "3", "3", "6", "2", "4", "3", "6", "6", "4", "4…
$ Q8c           <chr> "2", "6", "5", "1", "2", "1", "2", "4", "3", "3", "1", "1", "1…
$ Q8d           <chr> "5", "7", "7", "7", "3", "7", "2", "4", "3", "5", "5", "6", "1…
$ Q8e           <chr> "5", "6", "7", "7", "2", "2", "5", "4", "3", "7", "5", "5", "4…
$ Q10a          <chr> "7", "7", "7", "6", "3", "6", "2", "4", "1", "6", "6", "5", "4…
$ Q10b          <chr> "7", "7", "7", "5", "3", "7", "2", "4", "5", "6", "5", "5", "6…
$ Q10c          <chr> "5", "7", "5", "1", "4", "5", "2", "4", "4", "5", "5", "7", "4…
$ Q10d          <chr> "3", "3", "6", "2", "3", "2", "2", "4", "4", "5", "4", "4", "4…
$ Q11a          <chr> "4", "3", "7", "1", "1", "2", "1", "4", "4", "4", "2", "1", "1…
$ Q11b          <chr> "3", "6", "7", "1", "1", "2", "1", "4", "1", "6", "6", "2", "1…
$ Q11c          <chr> "6", "7", "5", "4", "1", "6", "1", "4", "4", "2", "3", "4", "1…
$ Q11d          <chr> "1", "2", "5", "2", "1", "2", "1", "4", "4", "5", "1", "2", "1…
$ Q11e          <chr> "1", "1", "5", "1", "1", "2", "1", "4", "4", "4", "2", "1", "1…
$ Q11f          <chr> "3", "6", "7", "4", "1", "2", "1", "4", "4", "2", "3", "6", "1…
$ Q12a          <chr> "7", "7", "7", "7", "7", "7", "7", "4", "7", "7", "7", "7", "7…
$ Q12b          <chr> "7", "7", "7", "7", "7", "7", "7", "4", "7", "7", "6", "7", "7…
$ Q12c          <chr> "7", "5", "7", "7", "7", "7", "7", "4", "7", "6", "7", "7", "7…
$ Q12d          <chr> "5", "3", "7", "7", "5", "7", "7", "4", "7", "6", "7", "7", "7…
$ Q12e          <chr> "6", "5", "7", "7", "6", "5", "7", "4", "7", "6", "4", "7", "7…
$ Q12f          <chr> "4", "3", "6", "5", "4", "5", "7", "4", "7", "6", "1", "6", "7…
$ Q12g          <chr> "7", "6", "7", "6", "6", "7", "7", "4", "7", "6", "3", "5", "7…
$ Q12h          <chr> "6", "6", "7", "5", "4", "5", "7", "4", "7", "6", "2", "5", "7…
$ Q12i          <chr> "4", "3", "7", "3", "2", "7", "7", "4", "7", "6", "7", "5", "7…
$ Q13a          <chr> "6", "4", "8", "3", "7", "2", "8", "4", "5", "4", "8", "5", "7…
$ Q13b          <chr> "8", "3", "2", "8", "5", "8", "8", "4", "8", "8", "8", "8", "1…
$ Q13c          <chr> "3", "5", "8", "6", "4", "8", "8", "4", "8", "8", "2", "8", "8…
$ Q13d          <chr> "7", "7", "8", "8", "6", "7", "6", "-1", "8", "8", "4", "8", "…
$ Q13e          <chr> "7", "7", "8", "7", "4", "8", "6", "-1", "8", "8", "8", "8", "…
$ Q13f          <chr> "8", "5", "8", "8", "4", "8", "8", "4", "8", "8", "8", "8", "8…
$ Q13g          <chr> "8", "4", "8", "8", "5", "8", "8", "4", "1", "8", "8", "8", "8…
$ Q14a          <chr> "7", "3", "8", "2", "7", "3", "8", "4", "7", "2", "8", "5", "7…
$ Q14b          <chr> "8", "4", "4", "8", "5", "8", "8", "4", "8", "8", "8", "8", "1…
$ Q14c          <chr> "8", "5", "8", "5", "4", "8", "8", "4", "8", "8", "8", "8", "-…
$ Q14d          <chr> "5", "6", "8", "8", "5", "8", "6", "4", "8", "8", "8", "8", "-…
$ Q14e          <chr> "8", "6", "8", "5", "8", "8", "5", "4", "8", "8", "8", "8", "-…
$ Q14f          <chr> "8", "5", "8", "8", "8", "8", "8", "4", "8", "8", "8", "8", "8…
$ Q14g          <chr> "8", "3", "8", "8", "8", "8", "8", "4", "1", "8", "8", "8", "8…
$ Q15a          <chr> "7", "4", "8", "3", "7", "7", "6", "4", "7", "5", "8", "6", "7…
$ Q15b          <chr> "8", "3", "5", "8", "5", "8", "8", "4", "8", "8", "8", "8", "3…
$ Q15c          <chr> "8", "5", "8", "5", "5", "8", "8", "4", "8", "8", "7", "8", "-…
$ Q15d          <chr> "7", "6", "7", "8", "5", "7", "6", "4", "8", "8", "6", "8", "8…
$ Q15e          <chr> "8", "6", "8", "6", "8", "8", "6", "4", "8", "8", "8", "8", "8…
$ Q15f          <chr> "8", "4", "8", "8", "8", "8", "-1", "4", "8", "8", "8", "8", "…
$ Q15g          <chr> "8", "3", "8", "8", "8", "8", "8", "4", "1", "8", "8", "8", "8…
$ Q17           <chr> "5", "7", "5", "1", "3", "5", "1", "-1", "4", "6", "6", "3", "…
$ Q18           <chr> "1", "1", "1", "2", "2", "2", "2", "2", "2", "2", "2", "2", "2…
$ Q19           <chr> "1", "3", "1", "-2", "-2", "-2", "-2", "-2", "-2", "-2", "-2",…
$ Q21           <chr> "2002", "2002", "2002", "2001", "2004", "2002", "2000", "2004"…
$ Q22           <chr> "2", "1", "1", "2", "1", "2", "1", "1", "1", "1", "2", "1", "1…
$ Q23           <chr> "3", "1", "1", "2", "1", "1", "1", "3", "1", "1", "3", "2", "3…
$ Q24           <chr> "6", "6", "5", "6", "5", "5", "6", "5", "6", "6", "7", "6", "6…
$ Q25a          <chr> "1", "0", "0", "0", "1", "1", "0", "1", "1", "1", "0", "1", "1…
$ Q25b          <chr> "0", "0", "1", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0…
$ Q25c          <chr> "0", "0", "0", "1", "0", "0", "0", "0", "0", "0", "1", "0", "0…
$ Q25d          <chr> "1", "1", "1", "0", "0", "1", "1", "0", "0", "0", "1", "0", "0…
$ Q25e          <chr> "0", "0", "0", "1", "0", "0", "0", "0", "0", "0", "0", "0", "0…
$ Q25f          <chr> "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0…
$ Q25g          <chr> "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0…
$ Q25h          <chr> "0", "1", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0…
$ Q25i          <chr> "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0…
$ Q25j          <chr> "0", "0", "0", "0", "0", "0", "1", "0", "0", "0", "0", "0", "0…
$ Q25k          <chr> "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0…
$ Q25l          <chr> "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0…
$ Q25l_text     <chr> "-2", "-2", "-2", "-2", "-2", "-2", "-2", "-2", "-2", "-2", "-…
$ Q26           <chr> "2", "3", "3", "2", "1", "3", "5", "1", "4", "1", "1", "1", "4…
question_lookup <- tibble(
  variable = var_names,
  question = question_text
)

question_lookup
data_clean <- data_raw |>
  mutate(
    across(
      everything(),
      ~ replace(as.character(.), as.character(.) == "-1", NA)
    )
  )

glimpse(data_clean)
Rows: 338
Columns: 93
$ respondent_id <chr> "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12",…
$ Q1            <chr> "1", "1", "1", "1", "1", "1", "1", "1", "1", "1", "1", "1", "1…
$ Q2            <chr> "3", "2", "3", "2", "3", "2", "3", "3", "3", "3", "2", "2", "3…
$ Q3a           <chr> "1", "1", "1", "1", "1", "1", "1", "1", "1", "1", "1", "1", "1…
$ Q3b           <chr> "1", "1", "1", "1", "0", "1", "1", "1", "1", "1", "1", "1", "1…
$ Q3c           <chr> "1", "1", "1", "1", "1", "1", "1", "1", "1", "1", "1", "1", "1…
$ Q3d           <chr> "0", "0", "1", "0", "0", "0", "0", "0", "0", "0", "0", "0", "1…
$ Q3e           <chr> "1", "1", "1", "1", "1", "1", "1", "1", "1", "1", "1", "0", "1…
$ Q3f           <chr> "0", "0", "0", "0", "0", "0", "0", "1", "0", "0", "0", "0", "0…
$ Q3g           <chr> "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0…
$ Q3g_text      <chr> "-2", "-2", "-2", "-2", "-2", "-2", "-2", "-2", "-2", "-2", "-…
$ Q4            <chr> "3", "2", "1", "1", "2", "2", "1", "1", "4", "2", "2", "1", "2…
$ Q4_5_text     <chr> "-2", "-2", "-2", "-2", "-2", "-2", "-2", "-2", "-2", "-2", "-…
$ Q5a           <chr> "5", "7", "7", "4", "5", "7", "7", "4", "5", "5", "7", "7", "7…
$ Q5b           <chr> "5", "6", "5", "4", "2", "5", "2", "4", "4", "2", "2", "2", "1…
$ Q5c           <chr> "6", "6", "7", "6", "7", "7", "7", "4", "5", "6", "7", "7", "7…
$ Q5d           <chr> "6", "3", "5", "7", "5", "7", "7", "4", "6", "7", "6", "6", "4…
$ Q5e           <chr> "5", "5", "6", "1", "4", "5", "4", "4", "3", "1", "6", "5", "1…
$ Q6a           <chr> "6", "7", "7", "6", "5", "7", "6", "4", "4", "6", "6", "7", "7…
$ Q6b           <chr> "2", "6", "7", "4", "4", "4", "4", "4", "3", "5", "3", "4", "4…
$ Q6c           <chr> "6", "7", "7", "6", "5", "5", "3", "4", "6", "5", "5", "5", "4…
$ Q6d           <chr> "2", "7", "6", "4", "6", "6", "5", "4", "4", "6", "6", "5", "5…
$ Q6e           <chr> "5", "1", "7", "2", "3", "1", "2", "4", "4", "5", "2", "1", "1…
$ Q6f           <chr> "6", "5", "3", "4", "3", "1", "2", "4", "5", "5", "1", "1", "1…
$ Q6g           <chr> "6", "6", "7", "6", "5", "1", "4", "4", "6", "6", "5", "7", "4…
$ Q6h           <chr> "5", "7", "7", "6", "6", "6", "3", "4", "5", "6", "6", "6", "4…
$ Q6i           <chr> "3", "6", "5", "4", "4", "5", "3", "4", "4", "5", "2", "5", "4…
$ Q8a           <chr> "5", "7", "7", "1", "3", "3", "2", "4", "4", "6", "6", "3", "1…
$ Q8b           <chr> "7", "7", "6", "3", "3", "6", "2", "4", "3", "6", "6", "4", "4…
$ Q8c           <chr> "2", "6", "5", "1", "2", "1", "2", "4", "3", "3", "1", "1", "1…
$ Q8d           <chr> "5", "7", "7", "7", "3", "7", "2", "4", "3", "5", "5", "6", "1…
$ Q8e           <chr> "5", "6", "7", "7", "2", "2", "5", "4", "3", "7", "5", "5", "4…
$ Q10a          <chr> "7", "7", "7", "6", "3", "6", "2", "4", "1", "6", "6", "5", "4…
$ Q10b          <chr> "7", "7", "7", "5", "3", "7", "2", "4", "5", "6", "5", "5", "6…
$ Q10c          <chr> "5", "7", "5", "1", "4", "5", "2", "4", "4", "5", "5", "7", "4…
$ Q10d          <chr> "3", "3", "6", "2", "3", "2", "2", "4", "4", "5", "4", "4", "4…
$ Q11a          <chr> "4", "3", "7", "1", "1", "2", "1", "4", "4", "4", "2", "1", "1…
$ Q11b          <chr> "3", "6", "7", "1", "1", "2", "1", "4", "1", "6", "6", "2", "1…
$ Q11c          <chr> "6", "7", "5", "4", "1", "6", "1", "4", "4", "2", "3", "4", "1…
$ Q11d          <chr> "1", "2", "5", "2", "1", "2", "1", "4", "4", "5", "1", "2", "1…
$ Q11e          <chr> "1", "1", "5", "1", "1", "2", "1", "4", "4", "4", "2", "1", "1…
$ Q11f          <chr> "3", "6", "7", "4", "1", "2", "1", "4", "4", "2", "3", "6", "1…
$ Q12a          <chr> "7", "7", "7", "7", "7", "7", "7", "4", "7", "7", "7", "7", "7…
$ Q12b          <chr> "7", "7", "7", "7", "7", "7", "7", "4", "7", "7", "6", "7", "7…
$ Q12c          <chr> "7", "5", "7", "7", "7", "7", "7", "4", "7", "6", "7", "7", "7…
$ Q12d          <chr> "5", "3", "7", "7", "5", "7", "7", "4", "7", "6", "7", "7", "7…
$ Q12e          <chr> "6", "5", "7", "7", "6", "5", "7", "4", "7", "6", "4", "7", "7…
$ Q12f          <chr> "4", "3", "6", "5", "4", "5", "7", "4", "7", "6", "1", "6", "7…
$ Q12g          <chr> "7", "6", "7", "6", "6", "7", "7", "4", "7", "6", "3", "5", "7…
$ Q12h          <chr> "6", "6", "7", "5", "4", "5", "7", "4", "7", "6", "2", "5", "7…
$ Q12i          <chr> "4", "3", "7", "3", "2", "7", "7", "4", "7", "6", "7", "5", "7…
$ Q13a          <chr> "6", "4", "8", "3", "7", "2", "8", "4", "5", "4", "8", "5", "7…
$ Q13b          <chr> "8", "3", "2", "8", "5", "8", "8", "4", "8", "8", "8", "8", "1…
$ Q13c          <chr> "3", "5", "8", "6", "4", "8", "8", "4", "8", "8", "2", "8", "8…
$ Q13d          <chr> "7", "7", "8", "8", "6", "7", "6", NA, "8", "8", "4", "8", "8"…
$ Q13e          <chr> "7", "7", "8", "7", "4", "8", "6", NA, "8", "8", "8", "8", "8"…
$ Q13f          <chr> "8", "5", "8", "8", "4", "8", "8", "4", "8", "8", "8", "8", "8…
$ Q13g          <chr> "8", "4", "8", "8", "5", "8", "8", "4", "1", "8", "8", "8", "8…
$ Q14a          <chr> "7", "3", "8", "2", "7", "3", "8", "4", "7", "2", "8", "5", "7…
$ Q14b          <chr> "8", "4", "4", "8", "5", "8", "8", "4", "8", "8", "8", "8", "1…
$ Q14c          <chr> "8", "5", "8", "5", "4", "8", "8", "4", "8", "8", "8", "8", NA…
$ Q14d          <chr> "5", "6", "8", "8", "5", "8", "6", "4", "8", "8", "8", "8", NA…
$ Q14e          <chr> "8", "6", "8", "5", "8", "8", "5", "4", "8", "8", "8", "8", NA…
$ Q14f          <chr> "8", "5", "8", "8", "8", "8", "8", "4", "8", "8", "8", "8", "8…
$ Q14g          <chr> "8", "3", "8", "8", "8", "8", "8", "4", "1", "8", "8", "8", "8…
$ Q15a          <chr> "7", "4", "8", "3", "7", "7", "6", "4", "7", "5", "8", "6", "7…
$ Q15b          <chr> "8", "3", "5", "8", "5", "8", "8", "4", "8", "8", "8", "8", "3…
$ Q15c          <chr> "8", "5", "8", "5", "5", "8", "8", "4", "8", "8", "7", "8", NA…
$ Q15d          <chr> "7", "6", "7", "8", "5", "7", "6", "4", "8", "8", "6", "8", "8…
$ Q15e          <chr> "8", "6", "8", "6", "8", "8", "6", "4", "8", "8", "8", "8", "8…
$ Q15f          <chr> "8", "4", "8", "8", "8", "8", NA, "4", "8", "8", "8", "8", "8"…
$ Q15g          <chr> "8", "3", "8", "8", "8", "8", "8", "4", "1", "8", "8", "8", "8…
$ Q17           <chr> "5", "7", "5", "1", "3", "5", "1", NA, "4", "6", "6", "3", "2"…
$ Q18           <chr> "1", "1", "1", "2", "2", "2", "2", "2", "2", "2", "2", "2", "2…
$ Q19           <chr> "1", "3", "1", "-2", "-2", "-2", "-2", "-2", "-2", "-2", "-2",…
$ Q21           <chr> "2002", "2002", "2002", "2001", "2004", "2002", "2000", "2004"…
$ Q22           <chr> "2", "1", "1", "2", "1", "2", "1", "1", "1", "1", "2", "1", "1…
$ Q23           <chr> "3", "1", "1", "2", "1", "1", "1", "3", "1", "1", "3", "2", "3…
$ Q24           <chr> "6", "6", "5", "6", "5", "5", "6", "5", "6", "6", "7", "6", "6…
$ Q25a          <chr> "1", "0", "0", "0", "1", "1", "0", "1", "1", "1", "0", "1", "1…
$ Q25b          <chr> "0", "0", "1", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0…
$ Q25c          <chr> "0", "0", "0", "1", "0", "0", "0", "0", "0", "0", "1", "0", "0…
$ Q25d          <chr> "1", "1", "1", "0", "0", "1", "1", "0", "0", "0", "1", "0", "0…
$ Q25e          <chr> "0", "0", "0", "1", "0", "0", "0", "0", "0", "0", "0", "0", "0…
$ Q25f          <chr> "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0…
$ Q25g          <chr> "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0…
$ Q25h          <chr> "0", "1", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0…
$ Q25i          <chr> "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0…
$ Q25j          <chr> "0", "0", "0", "0", "0", "0", "1", "0", "0", "0", "0", "0", "0…
$ Q25k          <chr> "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0…
$ Q25l          <chr> "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0…
$ Q25l_text     <chr> "-2", "-2", "-2", "-2", "-2", "-2", "-2", "-2", "-2", "-2", "-…
$ Q26           <chr> "2", "3", "3", "2", "1", "3", "5", "1", "4", "1", "1", "1", "4…
ids_removed <- data_clean |>
  filter(is.na(Q22) | is.na(Q23)) |>
  pull(respondent_id)

ids_removed
[1] "63"  "64"  "181" "272" "325"
data_clean <- data_clean |>
  filter(!is.na(Q22), !is.na(Q23))

nrow(data_raw)
[1] 338
nrow(data_clean)
[1] 333
missing_summary <- data_clean |>
  summarise(across(everything(), ~ sum(is.na(.)))) |>
  pivot_longer(
    cols = everything(),
    names_to = "variable",
    values_to = "n_missing"
  ) |>
  arrange(desc(n_missing))

missing_summary
question_lookup |> 
  filter(grepl("Q13|Q14|Q15", variable))
data_clean |>
  select(Q13a:Q15g) |>
  summarise(across(everything(), ~ paste(sort(unique(.)), collapse = ", "))) |>
  pivot_longer(
    cols = everything(),
    names_to = "variable",
    values_to = "values"
  )
data_clean <- data_clean |>
  mutate(
    across(
      Q13a:Q15g,
      ~ as.numeric(replace(., . == "8", NA))
    )
  )
data_clean |>
  select(Q13a:Q15g) |>
  summarise(across(everything(), ~ paste(sort(unique(.)), collapse = ", "))) |>
  pivot_longer(
    cols = everything(),
    names_to = "variable",
    values_to = "values"
  )
bank_means <- tibble(
  bank = c("OTP", "Gorenjska Banka", "NLB", "Revolut", "N26", "Intesa SanPaolo", "UniCredit"),
  innovation = c(
    mean(data_clean$Q13a, na.rm = TRUE),
    mean(data_clean$Q13b, na.rm = TRUE),
    mean(data_clean$Q13c, na.rm = TRUE),
    mean(data_clean$Q13d, na.rm = TRUE),
    mean(data_clean$Q13e, na.rm = TRUE),
    mean(data_clean$Q13f, na.rm = TRUE),
    mean(data_clean$Q13g, na.rm = TRUE)
  ),
  customer_support = c(
    mean(data_clean$Q14a, na.rm = TRUE),
    mean(data_clean$Q14b, na.rm = TRUE),
    mean(data_clean$Q14c, na.rm = TRUE),
    mean(data_clean$Q14d, na.rm = TRUE),
    mean(data_clean$Q14e, na.rm = TRUE),
    mean(data_clean$Q14f, na.rm = TRUE),
    mean(data_clean$Q14g, na.rm = TRUE)
  ),
  reliability = c(
    mean(data_clean$Q15a, na.rm = TRUE),
    mean(data_clean$Q15b, na.rm = TRUE),
    mean(data_clean$Q15c, na.rm = TRUE),
    mean(data_clean$Q15d, na.rm = TRUE),
    mean(data_clean$Q15e, na.rm = TRUE),
    mean(data_clean$Q15f, na.rm = TRUE),
    mean(data_clean$Q15g, na.rm = TRUE)
  )
)

bank_means
pca_result <- prcomp(
  bank_means[, c("innovation", "customer_support", "reliability")],
  scale. = TRUE
)

pca_result
Standard deviations (1, .., p=3):
[1] 1.6443246 0.5059028 0.2006464

Rotation (n x k) = (3 x 3):
                       PC1         PC2        PC3
innovation       0.5700010  0.66141369  0.4874739
customer_support 0.5614043 -0.74671513  0.3567095
reliability      0.5999367  0.07034521 -0.7969489
bank_coordinates <- as.data.frame(pca_result$x)
bank_coordinates$bank <- bank_means$bank

bank_coordinates
plot(
  bank_coordinates$PC1,
  bank_coordinates$PC2,
  xlab = "PC1",
  ylab = "PC2",
  main = "Perception Map of Banks",
  pch = 19
)

text(
  bank_coordinates$PC1,
  bank_coordinates$PC2,
  labels = bank_coordinates$bank,
  pos = 3
)

library(ggplot2)

ggplot(bank_coordinates, aes(x = PC1, y = PC2, label = bank)) +
  geom_point(size = 3) +
  geom_text(vjust = -0.7) +
  labs(
    title = "Perception Map of Banks",
    x = "Dimension 1",
    y = "Dimension 2"
  ) +
  theme_minimal()

library(FactoMineR)
library(factoextra)
mat <- bank_means |>
  tibble::column_to_rownames("bank") |>
  as.matrix()

pca_bank <- FactoMineR::PCA(mat, scale.unit = TRUE, graph = FALSE)

factoextra::fviz_pca_ind(
  pca_bank,
  repel = TRUE
) +
  ggplot2::ggtitle("Perceptual map of banks (Q13–Q15)")

factoextra::fviz_pca_biplot(
  pca_bank,
  repel = TRUE,
  col.var = "gray30"
) +
  ggplot2::ggtitle("Perceptual map of banks with dimensions (Q13–Q15)")

factoextra::fviz_pca_biplot(
  pca_bank,
  repel = TRUE,
  col.var = "gray35",
  col.ind = "steelblue",
  pointsize = 3
) +
  ggplot2::ggtitle("Perceptual Map of Banks") +
  ggplot2::xlab("Overall Digital Banking Performance") +
  ggplot2::ylab("Customer Support vs Innovation") +
  ggplot2::theme_minimal() +
  ggplot2::theme(
    plot.title = ggplot2::element_text(face = "bold"),
    axis.title = ggplot2::element_text(face = "bold")
  )

factoextra::fviz_pca_biplot(
  pca_bank,
  repel = TRUE,
  col.var = "gray30"
) +
  ggplot2::ggtitle("Perceptual map of banks with dimensions (Q13–Q15)") +
  ggplot2::xlab("Dim1 (90.1%): Overall Digital Banking Performance") +
  ggplot2::ylab("Dim2 (8.5%): Customer Support vs Innovation")

data_clean |>
  select(Q6a, Q6b, Q6d, Q6e, Q6h, Q6i, Q8a, Q8b, Q8c, Q8d, Q8e) |>
  summarise(across(everything(), ~ paste(sort(unique(.)), collapse = ", "))) |>
  pivot_longer(
    cols = everything(),
    names_to = "variable",
    values_to = "values"
  )
cluster_data <- data_clean |>
  select(Q6a, Q6b, Q6d, Q6e, Q6h, Q6i, Q8a, Q8b, Q8c, Q8d, Q8e) |>
  mutate(across(everything(), as.numeric))

glimpse(cluster_data)
Rows: 333
Columns: 11
$ Q6a <dbl> 6, 7, 7, 6, 5, 7, 6, 4, 4, 6, 6, 7, 7, 5, 7, 7, 6, 6, 5, 4, 6, 7, 7, 7, …
$ Q6b <dbl> 2, 6, 7, 4, 4, 4, 4, 4, 3, 5, 3, 4, 4, 2, 1, 7, NA, 6, 5, 3, 6, 2, 1, 5,…
$ Q6d <dbl> 2, 7, 6, 4, 6, 6, 5, 4, 4, 6, 6, 5, 5, 2, 5, 6, 3, 3, 5, 5, 7, 7, 7, 5, …
$ Q6e <dbl> 5, 1, 7, 2, 3, 1, 2, 4, 4, 5, 2, 1, 1, 1, 2, 5, 2, 7, 2, 5, 5, 2, 1, 2, …
$ Q6h <dbl> 5, 7, 7, 6, 6, 6, 3, 4, 5, 6, 6, 6, 4, 3, 4, 7, NA, 6, 4, 5, 6, 4, 7, 7,…
$ Q6i <dbl> 3, 6, 5, 4, 4, 5, 3, 4, 4, 5, 2, 5, 4, 2, 2, 3, 7, 4, 5, 5, 7, 4, 1, 7, …
$ Q8a <dbl> 5, 7, 7, 1, 3, 3, 2, 4, 4, 6, 6, 3, 1, 3, 1, 5, 6, 4, 4, 4, 7, 4, 1, 6, …
$ Q8b <dbl> 7, 7, 6, 3, 3, 6, 2, 4, 3, 6, 6, 4, 4, 3, 3, 6, 6, 5, 3, 5, 7, 2, 7, 6, …
$ Q8c <dbl> 2, 6, 5, 1, 2, 1, 2, 4, 3, 3, 1, 1, 1, 3, 3, 3, 1, 1, 2, 2, 7, 3, 1, 1, …
$ Q8d <dbl> 5, 7, 7, 7, 3, 7, 2, 4, 3, 5, 5, 6, 1, 3, 3, 7, 4, 1, 5, 5, 7, 6, 7, 7, …
$ Q8e <dbl> 5, 6, 7, 7, 2, 2, 5, 4, 3, 7, 5, 5, 4, 3, 5, 5, 4, 1, 6, 5, 7, 4, 7, 7, …
cluster_data |>
  summarise(across(everything(), ~ sum(is.na(.)))) |>
  pivot_longer(
    cols = everything(),
    names_to = "variable",
    values_to = "n_missing"
  )
cluster_data_complete <- cluster_data |>
  tidyr::drop_na()

nrow(cluster_data)
[1] 333
nrow(cluster_data_complete)
[1] 323
cluster_scaled <- scale(cluster_data_complete)

cluster_scaled
               Q6a        Q6b         Q6d        Q6e         Q6h         Q6i
  [1,] -0.01386611 -0.8167893 -1.71942066  0.8688513  0.01405589 -0.48919895
  [2,]  0.73259278  1.1780913  1.11411441 -1.1392987  1.14906922  1.04489097
  [3,]  0.73259278  1.6768114  0.54740739  1.8729263  1.14906922  0.53352766
  [4,] -0.01386611  0.1806510 -0.58600663 -0.6372612  0.58156256  0.02216435
  [5,] -0.76032500  0.1806510  0.54740739 -0.1352237  0.58156256  0.02216435
  [6,]  0.73259278  0.1806510  0.54740739 -1.1392987  0.58156256  0.53352766
  [7,] -0.01386611  0.1806510 -0.01929962 -0.6372612 -1.12095744 -0.48919895
  [8,] -1.50678388  0.1806510 -0.58600663  0.3668138 -0.55345077  0.02216435
  [9,] -1.50678388 -0.3180692 -0.58600663  0.3668138  0.01405589  0.02216435
 [10,] -0.01386611  0.6793711  0.54740739  0.8688513  0.58156256  0.53352766
 [11,] -0.01386611 -0.3180692  0.54740739 -0.6372612  0.58156256 -1.00056226
 [12,]  0.73259278  0.1806510 -0.01929962 -1.1392987  0.58156256  0.53352766
 [13,]  0.73259278  0.1806510 -0.01929962 -1.1392987 -0.55345077  0.02216435
 [14,] -0.76032500 -0.8167893 -1.71942066 -1.1392987 -1.12095744 -1.00056226
 [15,]  0.73259278 -1.3155095 -0.01929962 -0.6372612 -0.55345077 -1.00056226
 [16,]  0.73259278  1.6768114  0.54740739  0.8688513  1.14906922 -0.48919895
 [17,] -0.01386611  1.1780913 -1.15271365  1.8729263  0.58156256  0.02216435
 [18,] -0.76032500  0.6793711 -0.01929962 -0.6372612 -0.55345077  0.53352766
 [19,] -1.50678388 -0.3180692 -0.01929962  0.8688513  0.01405589  0.53352766
 [20,] -0.01386611  1.1780913  1.11411441  0.8688513  0.58156256  1.55625428
 [21,]  0.73259278 -0.8167893  1.11411441 -0.6372612 -0.55345077  0.02216435
 [22,]  0.73259278 -1.3155095  1.11411441 -1.1392987  1.14906922 -1.51192557
 [23,]  0.73259278  0.6793711 -0.01929962 -0.6372612  1.14906922  1.55625428
 [24,]  0.73259278 -0.8167893  0.54740739 -0.1352237  1.14906922  1.55625428
 [25,] -0.76032500 -0.3180692 -0.01929962 -0.6372612 -1.12095744  1.04489097
 [26,] -2.25324277 -0.3180692 -0.58600663 -0.6372612  0.01405589  0.02216435
 [27,]  0.73259278  1.1780913  1.11411441 -0.1352237  0.01405589  0.53352766
 [28,] -0.01386611 -0.3180692 -0.01929962  0.3668138  0.01405589 -0.48919895
 [29,]  0.73259278  0.6793711  0.54740739 -0.6372612  1.14906922  1.55625428
 [30,]  0.73259278  1.6768114  1.11411441 -0.1352237  1.14906922 -1.00056226
 [31,] -0.01386611  1.6768114 -1.71942066  0.8688513 -0.55345077  0.53352766
 [32,]  0.73259278  0.1806510  0.54740739 -0.1352237  1.14906922  0.02216435
 [33,] -0.01386611 -0.8167893 -0.01929962 -1.1392987  0.01405589 -1.00056226
 [34,]  0.73259278  1.6768114  1.11411441  0.3668138  1.14906922 -1.51192557
 [35,] -0.01386611  0.6793711 -0.58600663  1.8729263 -1.68846410 -1.00056226
 [36,]  0.73259278  1.6768114  1.11411441  0.8688513  1.14906922  1.04489097
 [37,] -0.01386611 -1.3155095  1.11411441  1.8729263  1.14906922  1.55625428
 [38,] -0.76032500  0.1806510 -0.01929962  0.3668138  0.01405589  1.04489097
 [39,]  0.73259278  1.6768114 -1.71942066 -1.1392987 -0.55345077 -1.51192557
 [40,] -0.01386611  0.1806510 -0.01929962  1.3708888  0.01405589  0.02216435
 [41,] -0.76032500  1.6768114  1.11411441  1.8729263  1.14906922  0.53352766
 [42,] -0.76032500  0.6793711 -0.01929962 -0.1352237  0.01405589  0.02216435
 [43,]  0.73259278  1.1780913  0.54740739 -0.1352237 -0.55345077  0.53352766
 [44,] -0.01386611  0.6793711 -1.15271365  0.8688513  0.01405589  1.04489097
 [45,]  0.73259278  0.6793711  0.54740739  0.3668138  1.14906922  0.02216435
 [46,] -0.01386611  0.6793711 -0.01929962 -0.6372612  0.58156256 -0.48919895
 [47,]  0.73259278 -1.3155095 -1.71942066 -0.6372612  1.14906922  1.04489097
 [48,] -0.01386611 -0.3180692 -0.01929962  0.8688513 -0.55345077  0.53352766
 [49,]  0.73259278 -1.3155095 -2.28612767 -1.1392987 -2.25597077 -1.51192557
 [50,] -0.01386611  1.1780913 -0.01929962 -0.1352237  0.01405589  0.53352766
 [51,]  0.73259278  1.6768114  1.11411441  1.3708888  1.14906922  0.02216435
 [52,] -0.76032500 -1.3155095 -0.58600663  0.8688513  0.58156256  0.53352766
 [53,] -0.76032500 -0.8167893 -0.58600663 -0.1352237  0.58156256  0.02216435
 [54,] -1.50678388 -0.8167893 -0.01929962 -0.1352237  0.58156256  0.02216435
 [55,] -0.01386611 -0.3180692 -1.71942066 -0.6372612 -0.55345077  1.55625428
 [56,] -0.01386611  0.1806510  0.54740739 -0.6372612  0.01405589 -0.48919895
 [57,] -0.01386611 -0.3180692  0.54740739 -0.1352237  0.58156256 -1.00056226
 [58,] -0.01386611 -0.3180692 -0.58600663 -0.6372612  0.01405589 -0.48919895
 [59,] -0.01386611  0.1806510 -0.01929962 -0.6372612  0.01405589 -0.48919895
 [60,]  0.73259278  1.6768114 -0.01929962  0.8688513  0.58156256 -0.48919895
 [61,] -0.01386611  0.6793711 -0.01929962  0.8688513 -1.12095744  0.02216435
 [62,] -0.76032500  1.1780913  0.54740739  0.3668138  1.14906922 -1.51192557
 [63,]  0.73259278  1.6768114  1.11411441 -0.1352237  1.14906922  1.55625428
 [64,] -0.76032500  0.1806510  0.54740739 -0.1352237  1.14906922  0.53352766
 [65,]  0.73259278  0.6793711  1.11411441  1.8729263  0.58156256 -1.51192557
 [66,]  0.73259278  1.6768114  1.11411441  1.8729263  1.14906922  1.55625428
 [67,] -1.50678388  1.6768114  1.11411441  1.8729263  1.14906922  1.55625428
 [68,]  0.73259278  1.6768114  1.11411441  1.8729263  1.14906922  1.55625428
 [69,]  0.73259278  0.1806510 -0.01929962  0.3668138  0.01405589  0.53352766
 [70,] -0.76032500 -1.3155095  0.54740739 -1.1392987  0.01405589  1.04489097
 [71,]  0.73259278  0.1806510  1.11411441  1.8729263  1.14906922  1.55625428
 [72,] -1.50678388  0.1806510  1.11411441  0.3668138 -0.55345077  0.02216435
 [73,] -2.25324277 -0.8167893  0.54740739  0.3668138  1.14906922  1.04489097
 [74,] -1.50678388  0.1806510 -0.58600663 -1.1392987 -2.25597077 -1.51192557
 [75,] -0.76032500 -0.3180692  1.11411441 -0.1352237  1.14906922 -0.48919895
 [76,]  0.73259278  1.6768114 -1.15271365 -1.1392987 -0.55345077 -1.51192557
 [77,] -0.01386611  0.1806510 -0.58600663 -0.1352237 -0.55345077  0.53352766
 [78,] -0.01386611 -0.8167893 -1.15271365 -1.1392987  0.58156256 -0.48919895
 [79,] -0.01386611 -0.3180692 -0.01929962  1.3708888  0.01405589 -0.48919895
 [80,]  0.73259278  1.6768114  1.11411441 -1.1392987  0.58156256  1.55625428
 [81,] -0.01386611  0.6793711 -0.01929962  0.8688513  0.01405589 -0.48919895
 [82,] -0.01386611 -1.3155095  1.11411441  0.8688513  0.58156256  0.02216435
 [83,]  0.73259278 -0.3180692  1.11411441 -1.1392987 -2.25597077 -1.51192557
 [84,] -0.01386611  1.1780913  0.54740739  1.3708888  0.58156256 -0.48919895
 [85,]  0.73259278  0.1806510  1.11411441  1.8729263  1.14906922  1.55625428
 [86,] -0.76032500 -1.3155095 -1.15271365  0.8688513 -0.55345077  0.53352766
 [87,]  0.73259278  1.6768114  1.11411441  1.8729263  1.14906922  1.55625428
 [88,] -0.01386611  1.6768114 -0.01929962 -1.1392987  1.14906922  0.02216435
 [89,] -0.01386611 -1.3155095 -0.01929962 -0.1352237  0.01405589 -1.00056226
 [90,] -0.01386611 -0.8167893 -1.15271365 -0.1352237 -1.12095744 -0.48919895
               Q8a        Q8b         Q8c        Q8d        Q8e
  [1,]  0.56865867  1.2364653 -0.55192981  0.1609586 -0.1379083
  [2,]  1.59766008  1.2364653  1.41251459  1.1607592  0.4053160
  [3,]  1.59766008  0.7088850  0.92140349  1.1607592  0.9485403
  [4,] -1.48934414 -0.8738559 -1.04304091  1.1607592  0.9485403
  [5,] -0.46034273 -0.8738559 -0.55192981 -0.8388419 -1.7675813
  [6,] -0.46034273  0.7088850 -1.04304091  1.1607592 -1.7675813
  [7,] -0.97484344 -1.4014362 -0.55192981 -1.3387422 -0.1379083
  [8,]  0.05415797 -0.3462756  0.43029239 -0.3389417 -0.6811327
  [9,]  0.05415797 -0.8738559 -0.06081871 -0.8388419 -1.2243570
 [10,]  1.08315937  0.7088850 -0.06081871  0.1609586  0.9485403
 [11,]  1.08315937  0.7088850 -1.04304091  0.1609586 -0.1379083
 [12,] -0.46034273 -0.3462756 -1.04304091  0.6608589 -0.1379083
 [13,] -1.48934414 -0.3462756 -1.04304091 -1.8386425 -0.6811327
 [14,] -0.46034273 -0.8738559 -0.06081871 -0.8388419 -1.2243570
 [15,] -1.48934414 -0.8738559 -0.06081871 -0.8388419 -0.1379083
 [16,]  0.56865867  0.7088850 -0.06081871  1.1607592 -0.1379083
 [17,]  0.05415797  0.1813047 -1.04304091 -1.8386425 -2.3108056
 [18,]  0.05415797 -0.8738559 -0.55192981  0.1609586  0.4053160
 [19,]  0.05415797  0.1813047 -0.55192981  0.1609586 -0.1379083
 [20,]  1.59766008  1.2364653  1.90362568  1.1607592  0.9485403
 [21,]  0.05415797 -1.4014362 -0.06081871  0.6608589 -0.6811327
 [22,] -1.48934414  1.2364653 -1.04304091  1.1607592  0.9485403
 [23,]  1.08315937  0.7088850 -1.04304091  1.1607592  0.9485403
 [24,]  1.08315937  1.2364653  0.92140349  1.1607592  0.9485403
 [25,]  1.59766008  1.2364653 -1.04304091  1.1607592 -0.6811327
 [26,]  0.05415797  0.7088850 -1.04304091  0.1609586  0.4053160
 [27,]  0.56865867  0.1813047 -0.06081871  0.6608589  0.4053160
 [28,] -0.46034273  0.1813047  0.92140349 -0.3389417 -0.1379083
 [29,]  0.56865867  1.2364653  0.43029239  1.1607592  0.9485403
 [30,] -1.48934414  0.1813047 -1.04304091  1.1607592  0.9485403
 [31,]  0.05415797  1.2364653 -1.04304091  0.6608589  0.9485403
 [32,]  1.08315937  0.1813047  0.43029239  0.1609586  0.4053160
 [33,]  0.56865867  0.1813047 -1.04304091 -0.3389417 -0.1379083
 [34,]  0.05415797  0.1813047 -1.04304091  1.1607592 -0.1379083
 [35,] -0.97484344 -1.4014362 -0.06081871 -1.3387422 -0.6811327
 [36,]  1.59766008  0.7088850  0.43029239  1.1607592  0.9485403
 [37,]  1.59766008  1.2364653  1.90362568  0.1609586  0.9485403
 [38,] -0.46034273  0.7088850 -0.55192981  0.6608589  0.4053160
 [39,] -0.97484344 -0.3462756 -1.04304091  0.6608589 -2.3108056
 [40,] -0.97484344 -0.3462756 -0.55192981 -0.3389417 -0.6811327
 [41,]  0.05415797  0.1813047 -1.04304091  0.1609586 -0.1379083
 [42,]  0.05415797  0.1813047  0.43029239  0.1609586 -0.1379083
 [43,] -0.97484344 -0.8738559  0.92140349  0.6608589  0.9485403
 [44,] -0.97484344  0.7088850 -1.04304091  1.1607592 -2.3108056
 [45,]  1.59766008  1.2364653  1.90362568  1.1607592  0.9485403
 [46,]  0.05415797  0.1813047 -0.06081871  0.1609586 -0.1379083
 [47,]  1.59766008  1.2364653 -1.04304091  1.1607592  0.9485403
 [48,]  0.05415797 -0.3462756  0.43029239 -0.3389417 -0.6811327
 [49,] -1.48934414 -1.9290165 -1.04304091 -1.8386425 -2.3108056
 [50,] -1.48934414 -0.8738559  0.43029239 -0.8388419  0.4053160
 [51,] -0.97484344  0.1813047 -1.04304091  0.1609586 -0.1379083
 [52,]  0.56865867  1.2364653 -1.04304091  1.1607592  0.4053160
 [53,] -1.48934414  0.1813047 -1.04304091  0.1609586  0.4053160
 [54,]  1.59766008  1.2364653 -1.04304091 -0.8388419 -0.1379083
 [55,] -0.46034273  0.1813047 -1.04304091  1.1607592 -0.6811327
 [56,]  1.08315937  0.7088850  0.43029239  0.1609586  0.9485403
 [57,]  1.08315937  1.2364653 -1.04304091 -0.3389417 -0.1379083
 [58,] -0.97484344 -0.3462756 -0.06081871 -0.3389417 -1.2243570
 [59,] -0.97484344  0.1813047 -1.04304091 -1.3387422  0.9485403
 [60,]  1.08315937  0.7088850  0.92140349  0.1609586  0.9485403
 [61,] -0.46034273 -0.3462756 -0.06081871  0.1609586 -0.1379083
 [62,]  0.05415797  1.2364653 -1.04304091  1.1607592  0.4053160
 [63,]  0.05415797  1.2364653 -1.04304091  1.1607592  0.9485403
 [64,]  0.56865867  0.7088850  0.92140349  1.1607592  0.4053160
 [65,] -1.48934414  1.2364653 -0.06081871  1.1607592  0.9485403
 [66,]  1.59766008  1.2364653  1.90362568  1.1607592  0.9485403
 [67,]  1.59766008  1.2364653  1.90362568  1.1607592  0.9485403
 [68,]  1.08315937  0.7088850  1.41251459  0.6608589  0.4053160
 [69,] -0.46034273  0.1813047 -0.06081871 -0.3389417 -0.1379083
 [70,]  1.08315937  0.1813047  0.43029239  0.1609586 -0.1379083
 [71,]  1.59766008  1.2364653 -1.04304091  1.1607592  0.9485403
 [72,]  0.56865867  0.7088850 -0.06081871  0.1609586  0.4053160
 [73,]  0.05415797  1.2364653 -0.55192981  1.1607592  0.4053160
 [74,] -1.48934414 -1.9290165 -1.04304091 -1.8386425 -2.3108056
 [75,] -0.46034273  1.2364653 -1.04304091  1.1607592 -0.1379083
 [76,] -1.48934414 -0.3462756 -1.04304091  0.1609586  0.9485403
 [77,]  0.05415797 -0.3462756  0.43029239 -0.3389417 -0.1379083
 [78,]  0.56865867  0.7088850 -1.04304091  0.6608589  0.9485403
 [79,]  0.05415797  1.2364653 -1.04304091  0.6608589 -0.1379083
 [80,]  0.56865867  1.2364653 -0.06081871  1.1607592  0.9485403
 [81,]  1.08315937  0.1813047  0.43029239 -0.3389417 -0.6811327
 [82,]  1.59766008  1.2364653  1.90362568  1.1607592  0.9485403
 [83,]  0.05415797  0.1813047 -1.04304091  1.1607592  0.9485403
 [84,]  1.08315937  0.7088850  1.90362568  0.6608589  0.4053160
 [85,]  0.56865867  0.1813047  0.92140349  0.1609586  0.4053160
 [86,]  0.05415797  0.1813047  0.43029239  0.6608589  0.4053160
 [87,]  1.59766008  1.2364653  1.90362568  1.1607592  0.9485403
 [88,] -1.48934414 -0.3462756 -1.04304091  1.1607592  0.9485403
 [89,] -0.97484344 -0.8738559 -1.04304091  0.6608589 -0.6811327
 [90,] -0.97484344 -0.8738559 -0.06081871 -0.8388419 -0.1379083
 [ reached 'max' / getOption("max.print") -- omitted 233 rows ]
attr(,"scaled:center")
     Q6a      Q6b      Q6d      Q6e      Q6h      Q6i      Q8a      Q8b      Q8c 
6.018576 3.637771 5.034056 3.269350 4.975232 3.956656 3.894737 4.656347 3.123839 
     Q8d      Q8e 
4.678019 5.253870 
attr(,"scaled:scale")
     Q6a      Q6b      Q6d      Q6e      Q6h      Q6i      Q8a      Q8b      Q8c 
1.339659 2.005133 1.764580 1.991883 1.762094 1.955557 1.943632 1.895446 2.036199 
     Q8d      Q8e 
2.000399 1.840860 
library(factoextra)

fviz_nbclust(cluster_scaled, kmeans, method = "wss")

fviz_nbclust(cluster_scaled, kmeans, method = "silhouette")

install.packages("NbClust")
WARNING: Rtools is required to build R packages but is not currently installed. Please download and install the appropriate version of Rtools before proceeding:

https://cran.rstudio.com/bin/windows/Rtools/
trying URL 'https://cran.rstudio.com/bin/windows/contrib/4.5/NbClust_3.0.1.zip'
Content type 'application/zip' length 122135 bytes (119 KB)
downloaded 119 KB
package ‘NbClust’ successfully unpacked and MD5 sums checked

The downloaded binary packages are in
    C:\Users\frach\AppData\Local\Temp\Rtmp0giUNF\downloaded_packages
library(NbClust)

nb <- NbClust(
  data = cluster_scaled,
  distance = "euclidean",
  min.nc = 2,
  max.nc = 6,
  method = "kmeans"
)
*** : The Hubert index is a graphical method of determining the number of clusters.
                In the plot of Hubert index, we seek a significant knee that corresponds to a 
                significant increase of the value of the measure i.e the significant peak in Hubert
                index second differences plot. 
 

*** : The D index is a graphical method of determining the number of clusters. 
                In the plot of D index, we seek a significant knee (the significant peak in Dindex
                second differences plot) that corresponds to a significant increase of the value of
                the measure. 
 
******************************************************************* 
* Among all indices:                                                
* 11 proposed 2 as the best number of clusters 
* 9 proposed 3 as the best number of clusters 
* 1 proposed 4 as the best number of clusters 
* 1 proposed 5 as the best number of clusters 
* 2 proposed 6 as the best number of clusters 

                   ***** Conclusion *****                            
 
* According to the majority rule, the best number of clusters is  2 
 
 
******************************************************************* 

set.seed(123)

k2 <- kmeans(cluster_scaled, centers = 2, nstart = 25)

k2
K-means clustering with 2 clusters of sizes 238, 85

Cluster means:
          Q6a        Q6b        Q6d        Q6e        Q6h        Q6i        Q8a
1  0.05513429  0.2037010  0.2259559  0.1579831  0.3264230  0.2542116  0.3459966
2 -0.15437602 -0.5703629 -0.6326766 -0.4423526 -0.9139844 -0.7117924 -0.9687905
         Q8b        Q8c        Q8d        Q8e
1  0.4340112  0.2218797  0.4193104  0.3368423
2 -1.2152314 -0.6212631 -1.1740692 -0.9431585

Clustering vector:
  [1] 1 1 1 1 2 1 2 1 2 1 1 1 2 2 2 1 2 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 1 1 1 2 1
 [41] 1 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 1 2 2 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 1 2 1 1 1 1
 [81] 1 1 1 1 1 1 1 1 2 2 1 1 1 2 1 1 1 2 1 2 1 1 1 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1
[121] 1 1 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 1
[161] 1 2 2 2 2 1 2 1 2 2 1 2 2 1 1 2 1 1 2 1 2 1 1 1 1 1 2 1 2 2 2 2 2 1 1 1 1 1 2 2
[201] 1 1 1 1 1 1 1 1 1 1 1 2 2 1 2 2 2 1 1 2 1 1 1 1 1 1 1 1 2 1 2 1 1 2 2 1 1 2 1 1
[241] 2 2 1 1 1 1 2 1 2 2 1 2 1 2 1 1 1 2 1 1 1 2 1 2 1 1 1 1 1 1 1 1 2 1 1 2 1 2 2 1
[281] 1 1 1 1 2 1 2 1 1 2 1 1 1 2 2 2 1 1 2 2 1 1 1 2 2 1 2 1 2 1 2 1 2 1 1 1 2 1 2 1
[321] 2 1 1

Within cluster sum of squares by cluster:
[1] 1846.8502  846.5349
 (between_SS / total_SS =  24.0 %)

Available components:

[1] "cluster"      "centers"      "totss"        "withinss"     "tot.withinss"
[6] "betweenss"    "size"         "iter"         "ifault"      
cluster_profile <- cluster_data_complete |>
  mutate(cluster = factor(k2$cluster))

cluster_profile
cluster_means <- cluster_profile |>
  group_by(cluster) |>
  summarise(across(everything(), mean))

cluster_means
cluster_means_long <- cluster_means |>
  pivot_longer(
    cols = -cluster,
    names_to = "variable",
    values_to = "mean_score"
  )

ggplot(cluster_means_long, aes(x = variable, y = mean_score, group = cluster, color = cluster)) +
  geom_line(linewidth = 1) +
  geom_point(size = 2) +
  labs(
    title = "Cluster Profiles",
    x = "Variables",
    y = "Mean score"
  ) +
  theme_minimal()

factoextra::fviz_cluster(
  k2,
  data = cluster_scaled,
  ellipse.type = "norm",
  repel = TRUE,
  show.clust.cent = TRUE
)

factoextra::fviz_cluster(
  k2,
  data = cluster_scaled,
  geom = "point",
  ellipse.type = "norm",
  show.clust.cent = TRUE
)

cor(cluster_data_complete)
            Q6a        Q6b       Q6d         Q6e       Q6h        Q6i        Q8a
Q6a  1.00000000 0.01176175 0.1389877 -0.07520157 0.1764847 0.07617645 0.03653469
Q6b  0.01176175 1.00000000 0.3414224  0.42261790 0.3745293 0.15121749 0.17824705
Q6d  0.13898774 0.34142235 1.0000000  0.31193154 0.4736980 0.13182600 0.21203009
Q6e -0.07520157 0.42261790 0.3119315  1.00000000 0.3850304 0.21827155 0.18302136
Q6h  0.17648474 0.37452926 0.4736980  0.38503042 1.0000000 0.39082943 0.38280357
Q6i  0.07617645 0.15121749 0.1318260  0.21827155 0.3908294 1.00000000 0.41059955
Q8a  0.03653469 0.17824705 0.2120301  0.18302136 0.3828036 0.41059955 1.00000000
Q8b  0.13460949 0.27520233 0.2848516  0.25079750 0.5134995 0.38807919 0.63081727
Q8c  0.04241674 0.17760187 0.1803331  0.16862760 0.1878175 0.34685944 0.48433201
Q8d  0.05438779 0.26814657 0.2617786  0.20343458 0.4461829 0.40209612 0.50086129
Q8e  0.19956982 0.29759027 0.3816634  0.14136779 0.4021385 0.20320936 0.40589447
          Q8b        Q8c        Q8d       Q8e
Q6a 0.1346095 0.04241674 0.05438779 0.1995698
Q6b 0.2752023 0.17760187 0.26814657 0.2975903
Q6d 0.2848516 0.18033308 0.26177856 0.3816634
Q6e 0.2507975 0.16862760 0.20343458 0.1413678
Q6h 0.5134995 0.18781747 0.44618285 0.4021385
Q6i 0.3880792 0.34685944 0.40209612 0.2032094
Q8a 0.6308173 0.48433201 0.50086129 0.4058945
Q8b 1.0000000 0.33453431 0.75702507 0.5697885
Q8c 0.3345343 1.00000000 0.37960444 0.3014531
Q8d 0.7570251 0.37960444 1.00000000 0.5274318
Q8e 0.5697885 0.30145309 0.52743180 1.0000000
install.packages("hopkins")
WARNING: Rtools is required to build R packages but is not currently installed. Please download and install the appropriate version of Rtools before proceeding:

https://cran.rstudio.com/bin/windows/Rtools/
trying URL 'https://cran.rstudio.com/bin/windows/contrib/4.5/hopkins_1.1.zip'
Content type 'application/zip' length 86999 bytes (84 KB)
downloaded 84 KB
package ‘hopkins’ successfully unpacked and MD5 sums checked

The downloaded binary packages are in
    C:\Users\frach\AppData\Local\Temp\Rtmp0giUNF\downloaded_packages
library(hopkins)
hopkins(cluster_data_complete)
[1] 0.8835682
hc <- hclust(dist(cluster_scaled), method = "ward.D2")
plot(hc, labels = FALSE, hang = -1, main = "Dendrogram")

summary(aov(Q6a ~ cluster, data = cluster_profile))
             Df Sum Sq Mean Sq F value Pr(>F)  
cluster       1    4.9   4.934   2.764 0.0974 .
Residuals   321  573.0   1.785                 
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1
summary(aov(Q8a ~ cluster, data = cluster_profile))
             Df Sum Sq Mean Sq F value Pr(>F)    
cluster       1  409.0   409.0   162.6 <2e-16 ***
Residuals   321  807.4     2.5                   
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1
anova_results <- lapply(names(cluster_data_complete), function(var) {
  model <- aov(as.formula(paste(var, "~ cluster")), data = cluster_profile)
  data.frame(
    variable = var,
    p_value = summary(model)[[1]][["Pr(>F)"]][1]
  )
})

anova_results <- do.call(rbind, anova_results)

anova_results

3 groups now !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

set.seed(123)

k3 <- kmeans(cluster_scaled, centers = 3, nstart = 25)

k3
K-means clustering with 3 clusters of sizes 162, 67, 94

Cluster means:
          Q6a        Q6b        Q6d        Q6e         Q6h         Q6i         Q8a
1 -0.24886243 -0.0964158 -0.1277436 -0.1662137  0.00354651 -0.04728005  0.03827832
2  0.06412213 -0.7200228 -0.6705898 -0.5698234 -1.10401694 -0.79449048 -1.09770928
3  0.38318649  0.6793711  0.6981273  0.6926041  0.78079362  0.64776840  0.71644079
         Q8b        Q8c        Q8d         Q8e
1  0.1454813 -0.1426706  0.1424438  0.06328585
2 -1.4014362 -0.6838701 -1.3536646 -1.01355352
3  0.7481729  0.7333184  0.7193578  0.61335934

Clustering vector:
  [1] 1 3 3 1 1 1 2 1 1 3 1 1 2 2 2 3 1 1 1 3 1 1 3 3 1 1 3 1 3 1 1 3 1 3 2 3 3 1 2 1
 [41] 3 1 1 1 3 1 1 1 2 1 3 1 1 1 1 1 1 1 1 3 1 1 3 3 3 3 3 3 1 1 3 1 1 2 1 1 1 1 1 3
 [81] 1 3 1 3 3 1 3 1 1 2 3 3 1 2 3 3 1 2 3 2 1 3 1 1 3 1 3 1 1 1 1 1 2 1 1 3 3 3 3 1
[121] 1 3 1 1 1 1 1 1 1 1 1 2 3 3 1 1 3 3 1 2 3 1 3 3 1 1 3 3 1 3 3 3 3 3 3 1 3 3 2 3
[161] 1 2 2 2 2 1 2 1 2 2 1 2 2 1 1 1 1 1 2 1 1 1 3 1 1 1 2 1 2 2 2 2 2 3 1 3 1 1 2 2
[201] 1 1 1 1 3 3 1 3 3 3 1 2 2 1 2 2 2 1 3 2 3 1 3 1 1 1 3 3 1 1 2 3 3 1 2 1 1 2 3 1
[241] 2 1 1 1 1 1 2 1 2 2 1 2 1 2 1 3 3 2 1 3 1 2 1 2 1 1 1 1 3 1 3 3 2 3 3 1 3 2 2 1
[281] 3 1 3 1 2 1 2 1 1 2 1 3 3 2 1 2 1 1 1 1 1 1 3 2 2 3 1 3 2 1 2 1 2 1 1 3 2 1 1 1
[321] 2 1 3

Within cluster sum of squares by cluster:
[1] 1167.8778  632.8631  584.9675
 (between_SS / total_SS =  32.6 %)

Available components:

[1] "cluster"      "centers"      "totss"        "withinss"     "tot.withinss"
[6] "betweenss"    "size"         "iter"         "ifault"      
set.seed(123)

k4 <- kmeans(cluster_scaled, centers = 4, nstart = 25)

k4
K-means clustering with 4 clusters of sizes 97, 69, 84, 73

Cluster means:
          Q6a        Q6b         Q6d        Q6e         Q6h         Q6i        Q8a
1 -0.59102504  0.3965916  0.08586251  0.4444485  0.18372283 -0.18870711 -0.2269610
2  0.09431634 -0.7517389 -0.69277752 -0.5863299 -1.06338430 -0.79305251 -1.0643218
3  0.27938560 -0.5793036 -0.14748335 -0.7030042 -0.06026046  0.09521625  0.4094085
4  0.37470153  0.8501657  0.71043270  0.7725701  0.83033260  0.89078148  0.8364810
          Q8b        Q8c         Q8d         Q8e
1 -0.05801009 -0.2684018 -0.01941779 -0.04270408
2 -1.36320575 -0.6871633 -1.28802770 -1.03540940
3  0.50790201  0.1964300  0.45256710  0.36651424
4  0.78115625  0.7801250  0.72249042  0.61367600

Clustering vector:
  [1] 3 4 4 1 1 3 2 1 1 4 3 3 2 2 2 4 1 1 1 4 3 3 4 4 3 1 4 1 4 1 1 4 3 1 2 4 4 1 2 1
 [41] 1 1 1 1 4 1 3 1 2 1 1 3 1 1 3 3 3 2 1 4 1 1 4 4 1 4 4 4 1 3 4 1 1 2 1 1 1 3 1 4
 [81] 1 4 3 4 4 3 4 1 2 2 4 4 3 2 3 4 1 2 4 2 1 4 3 1 4 3 4 1 1 3 1 1 2 1 3 1 4 1 4 1
[121] 1 3 1 3 1 3 3 1 1 1 3 2 4 1 1 1 3 4 3 2 4 3 3 4 1 3 4 4 1 4 4 1 4 4 4 3 3 4 2 3
[161] 3 2 2 2 2 3 2 1 2 2 3 2 2 3 3 1 3 3 2 3 1 1 3 3 3 3 2 3 2 2 2 2 2 4 3 4 3 3 1 2
[201] 1 3 3 1 4 4 1 4 4 4 1 2 2 1 2 2 2 3 1 2 4 1 4 1 3 1 3 4 1 1 2 4 4 1 2 1 3 2 4 1
[241] 2 1 3 1 3 1 2 1 2 2 3 2 3 2 3 3 4 2 3 4 3 2 3 2 1 3 3 3 3 1 4 4 2 4 3 3 1 2 2 3
[281] 4 3 4 1 2 3 2 3 3 2 1 4 4 2 1 2 3 1 1 1 1 1 4 2 2 4 2 4 2 1 2 3 2 1 3 4 2 3 1 3
[321] 2 3 4

Within cluster sum of squares by cluster:
[1] 687.5222 639.5021 506.3095 371.1580
 (between_SS / total_SS =  37.8 %)

Available components:

[1] "cluster"      "centers"      "totss"        "withinss"     "tot.withinss"
[6] "betweenss"    "size"         "iter"         "ifault"      
cluster_profile_4 <- cluster_data_complete |>
  mutate(cluster = factor(k4$cluster))
cluster_means_4 <- cluster_profile_4 |>
  group_by(cluster) |>
  summarise(across(everything(), mean))

cluster_means_4
factoextra::fviz_cluster(
  k4,
  data = cluster_scaled,
  geom = "point",
  ellipse.type = "none",
  show.clust.cent = TRUE
)

cluster_sizes_4 <- data.frame(table(k4$cluster))
cluster_sizes_4$percent <- round(100 * cluster_sizes_4$Freq / sum(cluster_sizes_4$Freq), 1)

cluster_sizes_4
cluster_means_4_long <- cluster_means_4 |>
  pivot_longer(
    cols = -cluster,
    names_to = "variable",
    values_to = "mean_score"
  )

ggplot(
  cluster_means_4_long,
  aes(x = variable, y = mean_score, group = cluster, color = cluster)
) +
  geom_line(linewidth = 1) +
  geom_point(size = 2) +
  labs(
    title = "Cluster Profiles (4-Cluster Solution)",
    x = "Variables",
    y = "Mean score",
    color = "Cluster"
  ) +
  theme_minimal()

pca_cluster <- prcomp(cluster_data_complete, scale. = TRUE)

summary(pca_cluster)
Importance of components:
                         PC1   PC2    PC3     PC4     PC5     PC6     PC7     PC8
Standard deviation     2.044 1.168 1.0708 0.92877 0.87763 0.80827 0.74116 0.69154
Proportion of Variance 0.380 0.124 0.1042 0.07842 0.07002 0.05939 0.04994 0.04348
Cumulative Proportion  0.380 0.504 0.6082 0.68667 0.75669 0.81608 0.86602 0.90950
                          PC9    PC10    PC11
Standard deviation     0.6465 0.61845 0.44167
Proportion of Variance 0.0380 0.03477 0.01773
Cumulative Proportion  0.9475 0.98227 1.00000
round(pca_cluster$rotation[, 1:3], 3)
      PC1    PC2    PC3
Q6a 0.086 -0.053  0.761
Q6b 0.246  0.480 -0.112
Q6d 0.262  0.409  0.239
Q6e 0.223  0.493 -0.343
Q6h 0.353  0.239  0.121
Q6i 0.276 -0.200 -0.218
Q8a 0.347 -0.314 -0.156
Q8b 0.404 -0.196  0.045
Q8c 0.265 -0.272 -0.235
Q8d 0.381 -0.213 -0.025
Q8e 0.337 -0.055  0.301
pca_scores_2 <- as.data.frame(pca_cluster$x[, 1:2])

head(pca_scores_2)
fviz_nbclust(pca_scores_2, kmeans, method = "wss")

fviz_nbclust(pca_scores_2, kmeans, method = "silhouette")

nb_pca2 <- NbClust(
  data = pca_scores_2,
  distance = "euclidean",
  min.nc = 2,
  max.nc = 6,
  method = "kmeans"
)
*** : The Hubert index is a graphical method of determining the number of clusters.
                In the plot of Hubert index, we seek a significant knee that corresponds to a 
                significant increase of the value of the measure i.e the significant peak in Hubert
                index second differences plot. 
 

*** : The D index is a graphical method of determining the number of clusters. 
                In the plot of D index, we seek a significant knee (the significant peak in Dindex
                second differences plot) that corresponds to a significant increase of the value of
                the measure. 
 
******************************************************************* 
* Among all indices:                                                
* 10 proposed 2 as the best number of clusters 
* 7 proposed 3 as the best number of clusters 
* 3 proposed 4 as the best number of clusters 
* 2 proposed 5 as the best number of clusters 
* 2 proposed 6 as the best number of clusters 

                   ***** Conclusion *****                            
 
* According to the majority rule, the best number of clusters is  2 
 
 
******************************************************************* 

set.seed(123)

k4_pca2 <- kmeans(pca_scores_2, centers = 4, nstart = 25)

k4_pca2
K-means clustering with 4 clusters of sizes 102, 69, 70, 82

Cluster means:
         PC1        PC2
1  0.1690658  0.7994389
2 -3.0310459  0.1049628
3  2.5341729  0.1558428
4  0.1768945 -1.2157828

Clustering vector:
  [1] 4 3 3 1 1 1 2 1 1 3 1 1 2 2 2 3 1 1 1 3 4 1 3 3 4 4 3 1 3 1 1 3 4 1 2 3 3 1 2 1
 [41] 1 1 1 1 3 1 4 1 2 1 1 4 1 4 4 4 1 2 1 3 1 1 3 3 1 3 3 3 1 4 3 1 3 2 1 1 4 4 1 3
 [81] 1 3 4 3 3 4 3 1 2 2 3 3 4 2 4 3 1 2 3 4 1 3 4 1 3 4 3 1 1 4 1 1 2 1 4 1 4 1 3 4
[121] 1 4 4 1 1 4 4 1 1 1 4 2 1 1 4 1 3 3 4 2 3 4 3 3 1 4 3 3 4 3 3 1 1 3 3 1 3 1 2 4
[161] 4 2 2 2 2 4 2 1 2 2 4 2 2 4 4 1 4 4 2 4 4 1 4 4 4 4 2 4 2 2 2 2 2 3 4 1 4 4 1 2
[201] 1 4 4 1 3 3 1 3 3 3 1 2 2 1 2 2 2 4 1 2 3 1 3 1 1 1 4 3 2 1 2 3 3 1 2 1 4 2 1 1
[241] 2 1 1 4 4 1 2 1 2 2 1 2 4 2 4 3 3 2 4 3 4 2 4 2 1 4 4 4 3 1 1 3 2 1 4 4 1 2 2 4
[281] 3 4 3 1 2 4 2 4 4 2 1 1 3 2 4 2 4 1 2 1 1 4 3 2 2 3 4 3 2 1 2 1 2 1 4 3 2 4 1 4
[321] 2 4 3

Within cluster sum of squares by cluster:
[1] 131.7003 167.9382 101.4012 106.3939
 (between_SS / total_SS =  71.6 %)

Available components:

[1] "cluster"      "centers"      "totss"        "withinss"     "tot.withinss"
[6] "betweenss"    "size"         "iter"         "ifault"      
factoextra::fviz_cluster(
  k4_pca2,
  data = pca_scores_2,
  geom = "point",
  ellipse.type = "none",
  show.clust.cent = TRUE
)

cluster_profile_pca4 <- cluster_data_complete |>
  mutate(cluster = factor(k4_pca2$cluster))
cluster_means_pca4 <- cluster_profile_pca4 |>
  group_by(cluster) |>
  summarise(across(everything(), mean))

cluster_means_pca4
pca_plot_data <- pca_scores_2 |>
  mutate(
    cluster = factor(
      k4_pca2$cluster,
      levels = c(1, 2, 3, 4),
      labels = c(
        "Cautious guidance seekers",
        "AI skeptics",
        "AI-enthusiastic guidance seekers",
        "Feature-oriented adopters"
      )
    )
  )

ggplot(pca_plot_data, aes(x = PC1, y = PC2, color = cluster, shape = cluster)) +
  geom_point(size = 2.5, alpha = 0.8) +
  labs(
    title = "PCA-based 4-cluster solution",
    x = "PC1",
    y = "PC2",
    color = "Cluster",
    shape = "Cluster"
  ) +
  theme_minimal()

cluster_means_pca4_named <- cluster_means_pca4 |>
  mutate(
    cluster = factor(
      cluster,
      levels = c(1, 2, 3, 4),
      labels = c(
        "Cautious guidance seekers",
        "AI skeptics",
        "AI-enthusiastic guidance seekers",
        "Feature-oriented adopters"
      )
    )
  )

cluster_means_pca4_long <- cluster_means_pca4_named |>
  pivot_longer(
    cols = -cluster,
    names_to = "variable",
    values_to = "mean_score"
  )

ggplot(
  cluster_means_pca4_long,
  aes(x = variable, y = mean_score, group = cluster, color = cluster)
) +
  geom_line(linewidth = 1) +
  geom_point(size = 2) +
  labs(
    title = "Cluster Profiles (PCA-based 4-Cluster Solution)",
    x = "Variables",
    y = "Mean score",
    color = "Cluster"
  ) +
  theme_minimal()

cor_matrix <- cor(cluster_data_complete)

round(cor_matrix, 3)
       Q6a   Q6b   Q6d    Q6e   Q6h   Q6i   Q8a   Q8b   Q8c   Q8d   Q8e
Q6a  1.000 0.012 0.139 -0.075 0.176 0.076 0.037 0.135 0.042 0.054 0.200
Q6b  0.012 1.000 0.341  0.423 0.375 0.151 0.178 0.275 0.178 0.268 0.298
Q6d  0.139 0.341 1.000  0.312 0.474 0.132 0.212 0.285 0.180 0.262 0.382
Q6e -0.075 0.423 0.312  1.000 0.385 0.218 0.183 0.251 0.169 0.203 0.141
Q6h  0.176 0.375 0.474  0.385 1.000 0.391 0.383 0.513 0.188 0.446 0.402
Q6i  0.076 0.151 0.132  0.218 0.391 1.000 0.411 0.388 0.347 0.402 0.203
Q8a  0.037 0.178 0.212  0.183 0.383 0.411 1.000 0.631 0.484 0.501 0.406
Q8b  0.135 0.275 0.285  0.251 0.513 0.388 0.631 1.000 0.335 0.757 0.570
Q8c  0.042 0.178 0.180  0.169 0.188 0.347 0.484 0.335 1.000 0.380 0.301
Q8d  0.054 0.268 0.262  0.203 0.446 0.402 0.501 0.757 0.380 1.000 0.527
Q8e  0.200 0.298 0.382  0.141 0.402 0.203 0.406 0.570 0.301 0.527 1.000
library(corrplot)

corrplot(
  cor(cluster_data_complete),
  method = "color",
  type = "upper",
  tl.col = "black",
  tl.srt = 45
)

pca_variance <- data.frame(
  Component = paste0("PC", 1:length(pca_cluster$sdev)),
  Eigenvalue = pca_cluster$sdev^2,
  Proportion_Variance = (pca_cluster$sdev^2) / sum(pca_cluster$sdev^2),
  Cumulative_Variance = cumsum((pca_cluster$sdev^2) / sum(pca_cluster$sdev^2))
)

pca_variance$Eigenvalue <- round(pca_variance$Eigenvalue, 3)
pca_variance$Proportion_Variance <- round(pca_variance$Proportion_Variance, 3)
pca_variance$Cumulative_Variance <- round(pca_variance$Cumulative_Variance, 3)

pca_variance
pca_loadings <- as.data.frame(pca_cluster$rotation[, 1:3])

pca_loadings$Variable <- rownames(pca_loadings)
rownames(pca_loadings) <- NULL

pca_loadings <- pca_loadings[, c("Variable", "PC1", "PC2", "PC3")]

pca_loadings$PC1 <- round(pca_loadings$PC1, 3)
pca_loadings$PC2 <- round(pca_loadings$PC2, 3)
pca_loadings$PC3 <- round(pca_loadings$PC3, 3)

pca_loadings
hopkins(cluster_data_complete)
[1] 0.9490564
distance_matrix <- dist(cluster_data_complete, method = "euclidean")

distance_matrix
            1         2         3         4         5         6         7         8
2    9.797959                                                                      
3    8.717798  6.480741                                                            
4    7.745967  9.899495 10.099505                                                  
            9        10        11        12        13        14        15        16
2                                                                                  
3                                                                                  
4                                                                                  
           17        18        19        20        21        22        23        24
2                                                                                  
3                                                                                  
4                                                                                  
           25        26        27        28        29        30        31        32
2                                                                                  
3                                                                                  
4                                                                                  
           33        34        35        36        37        38        39        40
2                                                                                  
3                                                                                  
4                                                                                  
           41        42        43        44        45        46        47        48
2                                                                                  
3                                                                                  
4                                                                                  
           49        50        51        52        53        54        55        56
2                                                                                  
3                                                                                  
4                                                                                  
           57        58        59        60        61        62        63        64
2                                                                                  
3                                                                                  
4                                                                                  
           65        66        67        68        69        70        71        72
2                                                                                  
3                                                                                  
4                                                                                  
           73        74        75        76        77        78        79        80
2                                                                                  
3                                                                                  
4                                                                                  
           81        82        83        84        85        86        87        88
2                                                                                  
3                                                                                  
4                                                                                  
           89        90        91        92        93        94        95        96
2                                                                                  
3                                                                                  
4                                                                                  
           97        98        99       100       101       102       103       104
2                                                                                  
3                                                                                  
4                                                                                  
          105       106       107       108       109       110       111       112
2                                                                                  
3                                                                                  
4                                                                                  
          113       114       115       116       117       118       119       120
2                                                                                  
3                                                                                  
4                                                                                  
          121       122       123       124       125       126       127       128
2                                                                                  
3                                                                                  
4                                                                                  
          129       130       131       132       133       134       135       136
2                                                                                  
3                                                                                  
4                                                                                  
          137       138       139       140       141       142       143       144
2                                                                                  
3                                                                                  
4                                                                                  
          145       146       147       148       149       150       151       152
2                                                                                  
3                                                                                  
4                                                                                  
          153       154       155       156       157       158       159       160
2                                                                                  
3                                                                                  
4                                                                                  
          161       162       163       164       165       166       167       168
2                                                                                  
3                                                                                  
4                                                                                  
          169       170       171       172       173       174       175       176
2                                                                                  
3                                                                                  
4                                                                                  
          177       178       179       180       181       182       183       184
2                                                                                  
3                                                                                  
4                                                                                  
          185       186       187       188       189       190       191       192
2                                                                                  
3                                                                                  
4                                                                                  
          193       194       195       196       197       198       199       200
2                                                                                  
3                                                                                  
4                                                                                  
          201       202       203       204       205       206       207       208
2                                                                                  
3                                                                                  
4                                                                                  
          209       210       211       212       213       214       215       216
2                                                                                  
3                                                                                  
4                                                                                  
          217       218       219       220       221       222       223       224
2                                                                                  
3                                                                                  
4                                                                                  
          225       226       227       228       229       230       231       232
2                                                                                  
3                                                                                  
4                                                                                  
          233       234       235       236       237       238       239       240
2                                                                                  
3                                                                                  
4                                                                                  
          241       242       243       244       245       246       247       248
2                                                                                  
3                                                                                  
4                                                                                  
          249       250       251       252       253       254       255       256
2                                                                                  
3                                                                                  
4                                                                                  
          257       258       259       260       261       262       263       264
2                                                                                  
3                                                                                  
4                                                                                  
          265       266       267       268       269       270       271       272
2                                                                                  
3                                                                                  
4                                                                                  
          273       274       275       276       277       278       279       280
2                                                                                  
3                                                                                  
4                                                                                  
          281       282       283       284       285       286       287       288
2                                                                                  
3                                                                                  
4                                                                                  
          289       290       291       292       293       294       295       296
2                                                                                  
3                                                                                  
4                                                                                  
          297       298       299       300       301       302       303       304
2                                                                                  
3                                                                                  
4                                                                                  
          305       306       307       308       309       310       311       312
2                                                                                  
3                                                                                  
4                                                                                  
          313       314       315       316       317       318       319       320
2                                                                                  
3                                                                                  
4                                                                                  
          321       322
2                      
3                      
4                      
 [ reached 'max' / getOption("max.print") -- omitted 319 rows ]
distance_matrix_table <- as.matrix(distance_matrix)

distance_matrix_table[1:10, 1:10]
          1         2         3         4         5         6         7        8
1  0.000000  9.797959  8.717798  7.745967  7.745967  7.810250  8.306624 5.567764
2  9.797959  0.000000  6.480741  9.899495  9.899495  8.062258 11.269428 8.888194
3  8.717798  6.480741  0.000000 10.099505 10.295630 10.148892 11.618950 8.544004
4  7.745967  9.899495 10.099505  0.000000  7.211103  6.708204  6.557439 7.000000
5  7.745967  9.899495 10.295630  7.211103  0.000000  5.916080  5.000000 4.582576
6  7.810250  8.062258 10.148892  6.708204  5.916080  0.000000  8.246211 7.348469
7  8.306624 11.269428 11.618950  6.557439  5.000000  8.246211  0.000000 5.291503
8  5.567764  8.888194  8.544004  7.000000  4.582576  7.348469  5.291503 0.000000
9  6.082763 10.148892  9.848858  7.416198  3.316625  7.483315  5.099020 2.449490
10 6.082763  6.082763  4.358899  7.549834  7.416198  7.745967  8.366600 5.830952
           9       10
1   6.082763 6.082763
2  10.148892 6.082763
3   9.848858 4.358899
4   7.416198 7.549834
5   3.316625 7.416198
6   7.483315 7.745967
7   5.099020 8.366600
8   2.449490 5.830952
9   0.000000 6.928203
10  6.928203 0.000000
hc <- hclust(dist(cluster_data_complete), method = "ward.D2")

plot(hc, labels = FALSE, hang = -1, main = "Dendrogram")

cluster_sizes_pca4 <- data.frame(table(k4_pca2$cluster))
cluster_sizes_pca4$Percent <- round(
  100 * cluster_sizes_pca4$Freq / sum(cluster_sizes_pca4$Freq),
  1
)

names(cluster_sizes_pca4) <- c("Cluster", "Size", "Percent")

cluster_sizes_pca4
cluster_sizes_pca4 <- data.frame(table(k4_pca2$cluster))
cluster_sizes_pca4$Percent <- round(
  100 * cluster_sizes_pca4$Freq / sum(cluster_sizes_pca4$Freq),
  1
)

cluster_sizes_pca4$Cluster_Name <- c(
  "Cautious guidance seekers",
  "AI skeptics",
  "AI-enthusiastic guidance seekers",
  "Feature-oriented adopters"
)

cluster_sizes_pca4 <- cluster_sizes_pca4[, c("Var1", "Cluster_Name", "Freq", "Percent")]
names(cluster_sizes_pca4) <- c("Cluster", "Cluster_Name", "Size", "Percent")

cluster_sizes_pca4
cluster_mean_table <- cluster_means_pca4 |>
  mutate(
    cluster = factor(
      cluster,
      levels = c(1,2,3,4),
      labels = c(
        "Cautious guidance seekers",
        "AI skeptics",
        "AI-enthusiastic guidance seekers",
        "Feature-oriented adopters"
      )
    )
  )

cluster_mean_table
ggplot(pca_plot_data, aes(x = PC1, y = PC2, color = cluster, shape = cluster)) +
  geom_point(size = 2.5, alpha = 0.8) +
  labs(
    title = "Customer Segmentation Based on PCA Clustering",
    x = "Interest in AI banking features (PC1)",
    y = "Need for financial guidance (PC2)",
    color = "Cluster",
    shape = "Cluster"
  ) +
  theme_minimal()

set.seed(123)

k5_pca2 <- kmeans(pca_scores_2, centers = 5, nstart = 25)

k5_pca2
K-means clustering with 5 clusters of sizes 56, 99, 73, 33, 62

Cluster means:
         PC1        PC2
1 -1.7951634  0.6037454
2  0.4238399  0.6740437
3  0.3347926 -1.3280570
4 -3.9696761 -0.4418461
5  2.6633622  0.1772421

Clustering vector:
  [1] 3 5 5 2 1 2 1 1 1 5 2 2 1 4 1 5 1 2 2 5 1 2 5 5 3 3 2 2 5 2 2 2 3 2 1 5 5 2 1 2
 [41] 2 2 2 2 5 2 3 2 4 2 2 3 1 3 3 3 2 1 1 5 2 2 5 5 2 5 5 5 2 3 5 2 5 4 2 1 3 3 2 5
 [81] 2 5 3 5 5 3 5 2 1 1 5 2 3 4 3 5 2 1 5 1 2 5 3 2 5 3 5 2 2 3 2 2 4 2 3 2 3 2 5 3
[121] 2 3 3 2 2 3 3 2 2 2 3 4 2 2 3 1 3 5 3 1 5 3 2 5 2 3 5 5 3 5 5 2 2 5 5 2 5 2 1 3
[161] 3 4 1 4 4 3 4 2 4 4 3 1 4 3 3 1 3 3 4 3 1 2 3 2 3 3 1 3 4 1 4 1 1 5 3 2 3 3 1 1
[201] 2 3 3 2 5 2 2 5 5 5 2 1 1 2 4 4 4 3 2 4 5 2 2 2 2 2 3 5 1 2 4 5 5 1 4 2 3 1 2 2
[241] 1 1 2 3 3 2 1 2 4 4 2 1 3 1 3 2 5 1 3 5 3 1 2 4 2 3 3 3 5 2 2 5 1 2 3 3 2 1 4 2
[281] 5 3 5 2 4 3 1 3 3 1 2 2 5 4 1 1 3 2 1 1 2 1 5 1 4 5 1 5 1 2 4 2 4 2 2 5 4 3 1 3
[321] 4 3 5

Within cluster sum of squares by cluster:
[1]  84.46534 102.03941  90.80653  56.55989  82.57159
 (between_SS / total_SS =  76.7 %)

Available components:

[1] "cluster"      "centers"      "totss"        "withinss"     "tot.withinss"
[6] "betweenss"    "size"         "iter"         "ifault"      
cluster_profile_pca5 <- cluster_data_complete |>
  mutate(cluster = factor(k5_pca2$cluster))
cluster_means_pca5 <- cluster_profile_pca5 |>
  group_by(cluster) |>
  summarise(across(everything(), mean))

cluster_means_pca5
cluster_means_pca5_named <- cluster_means_pca5 |>
  mutate(
    cluster = factor(
      cluster,
      levels = c(1, 2, 3, 4, 5),
      labels = c(
        "Skeptical support seekers",
        "Cautious guidance seekers",
        "Feature-oriented adopters",
        "AI-resistant independents",
        "AI-enthusiastic guidance seekers"
      )
    )
  )

cluster_means_pca5_long <- cluster_means_pca5_named |>
  pivot_longer(
    cols = -cluster,
    names_to = "variable",
    values_to = "mean_score"
  )

ggplot(
  cluster_means_pca5_long,
  aes(x = variable, y = mean_score, group = cluster, color = cluster)
) +
  geom_line(linewidth = 1) +
  geom_point(size = 2) +
  labs(
    title = "Cluster Profiles (PCA-based 5-Cluster Solution)",
    x = "Variables",
    y = "Mean score",
    color = "Cluster"
  ) +
  theme_minimal()

cluster_sizes_pca5 <- data.frame(table(k5_pca2$cluster))
cluster_sizes_pca5$Percent <- round(
  100 * cluster_sizes_pca5$Freq / sum(cluster_sizes_pca5$Freq),
  1
)

cluster_sizes_pca5$Cluster_Name <- c(
  "Skeptical support seekers",
  "Cautious guidance seekers",
  "Feature-oriented adopters",
  "AI-resistant independents",
  "AI-enthusiastic guidance seekers"
)

cluster_sizes_pca5 <- cluster_sizes_pca5[, c("Var1", "Cluster_Name", "Freq", "Percent")]
names(cluster_sizes_pca5) <- c("Cluster", "Cluster_Name", "Size", "Percent")

cluster_sizes_pca5
cluster_profile_pca5 <- cluster_data_complete |>
  mutate(cluster = factor(k5_pca2$cluster))

cluster_means_pca5 <- cluster_profile_pca5 |>
  group_by(cluster) |>
  summarise(across(everything(), mean))

cluster_mean_table_pca5 <- cluster_means_pca5 |>
  mutate(
    cluster = factor(
      cluster,
      levels = c(1, 2, 3, 4, 5),
      labels = c(
        "Skeptical support seekers",
        "Cautious guidance seekers",
        "Feature-oriented adopters",
        "AI-resistant independents",
        "AI-enthusiastic guidance seekers"
      )
    )
  )

cluster_mean_table_pca5
pca_plot_data_5 <- pca_scores_2 |>
  mutate(
    cluster = factor(
      k5_pca2$cluster,
      levels = c(1, 2, 3, 4, 5),
      labels = c(
        "Skeptical support seekers",
        "Cautious guidance seekers",
        "Feature-oriented adopters",
        "AI-resistant independents",
        "AI-enthusiastic guidance seekers"
      )
    )
  )

ggplot(pca_plot_data_5, aes(x = PC1, y = PC2, color = cluster, shape = cluster)) +
  geom_point(size = 2.5, alpha = 0.8) +
  labs(
    title = "PCA-based 5-Cluster Solution",
    x = "PC1",
    y = "PC2",
    color = "Cluster",
    shape = "Cluster"
  ) +
  theme_minimal()

pca_plot_data_5 <- pca_scores_2 |>
  mutate(
    cluster = factor(
      k5_pca2$cluster,
      levels = c(1, 2, 3, 4, 5),
      labels = c(
        "Skeptical support seekers",
        "Cautious guidance seekers",
        "Feature-oriented adopters",
        "AI-resistant independents",
        "AI-enthusiastic guidance seekers"
      )
    )
  )

ggplot(pca_plot_data_5, aes(x = PC1, y = PC2, color = cluster, shape = cluster)) +
  geom_point(size = 2.8, alpha = 0.8) +
  labs(
    title = "Customer Segmentation (PCA-based 5-Cluster Solution)",
    x = "Interest in AI Banking Features (PC1)",
    y = "Need for Financial Guidance (PC2)",
    color = "Cluster",
    shape = "Cluster"
  ) +
  theme_minimal()

cluster_profile_pca2_5 <- pca_scores_2 |>
  mutate(cluster = factor(k5_pca2$cluster))

cluster_means_pca2_5 <- cluster_profile_pca2_5 |>
  group_by(cluster) |>
  summarise(across(everything(), mean))

cluster_means_pca2_5_named <- cluster_means_pca2_5 |>
  mutate(
    cluster = factor(
      cluster,
      levels = c(1, 2, 3, 4, 5),
      labels = c(
        "Skeptical support seekers",
        "Cautious guidance seekers",
        "Feature-oriented adopters",
        "AI-resistant independents",
        "AI-enthusiastic guidance seekers"
      )
    )
  ) |>
  rename(
    `Interest in AI Banking Features` = PC1,
    `Need for Financial Guidance` = PC2
  )

cluster_means_pca2_5_long <- cluster_means_pca2_5_named |>
  pivot_longer(
    cols = -cluster,
    names_to = "component",
    values_to = "mean_score"
  )

ggplot(
  cluster_means_pca2_5_long,
  aes(x = component, y = mean_score, group = cluster, color = cluster)
) +
  geom_line(linewidth = 1) +
  geom_point(size = 2) +
  labs(
    title = "Cluster Profiles (5-Cluster Solution Based on 2 PCs)",
    x = "Principal Components",
    y = "Mean component score",
    color = "Cluster"
  ) +
  theme_minimal()

cluster_profile_pca2_4 <- pca_scores_2 |>
  mutate(cluster = factor(k4_pca2$cluster))

cluster_means_pca2_4 <- cluster_profile_pca2_4 |>
  group_by(cluster) |>
  summarise(across(everything(), mean))

cluster_means_pca2_4_named <- cluster_means_pca2_4 |>
  mutate(
    cluster = factor(
      cluster,
      levels = c(1, 2, 3, 4),
      labels = c(
        "Cautious guidance seekers",
        "AI skeptics",
        "AI-enthusiastic guidance seekers",
        "Feature-oriented adopters"
      )
    )
  ) |>
  rename(
    `Interest in AI Banking Features` = PC1,
    `Need for Financial Guidance` = PC2
  )

cluster_means_pca2_4_long <- cluster_means_pca2_4_named |>
  pivot_longer(
    cols = -cluster,
    names_to = "component",
    values_to = "mean_score"
  )

ggplot(
  cluster_means_pca2_4_long,
  aes(x = component, y = mean_score, group = cluster, color = cluster)
) +
  geom_line(linewidth = 1) +
  geom_point(size = 2) +
  labs(
    title = "Cluster Profiles (4-Cluster Solution Based on 2 PCs)",
    x = "Principal Components",
    y = "Mean component score",
    color = "Cluster"
  ) +
  theme_minimal()

data_clean_complete <- data_clean |>
  filter(
    !is.na(Q6a), !is.na(Q6b), !is.na(Q6d), !is.na(Q6e), !is.na(Q6h), !is.na(Q6i),
    !is.na(Q8a), !is.na(Q8b), !is.na(Q8c), !is.na(Q8d), !is.na(Q8e)
  )
data_cluster_profile <- data_clean_complete |>
  mutate(cluster = factor(k4_pca2$cluster))
data_cluster_profile_5 <- data_clean_complete |>
  mutate(cluster = factor(k5_pca2$cluster))
data_cluster_profile_5 |>
  group_by(cluster) |>
  summarise(mean_age = mean(as.numeric(Q21), na.rm = TRUE))
data_cluster_profile_5 <- data_cluster_profile_5 |>
  mutate(age = 2026 - as.numeric(Q21))
data_cluster_profile_5 |>
  group_by(cluster) |>
  summarise(mean_age = mean(age, na.rm = TRUE))
data_cluster_profile_5 |>
  group_by(cluster) |>
  summarise(mobile_banking_use = mean(as.numeric(Q2), na.rm = TRUE))
data_cluster_profile_5 |>
  group_by(cluster) |>
  summarise(trust = mean(as.numeric(Q24), na.rm = TRUE))
names(data_cluster_profile_5)
 [1] "respondent_id" "Q1"            "Q2"            "Q3a"           "Q3b"          
 [6] "Q3c"           "Q3d"           "Q3e"           "Q3f"           "Q3g"          
[11] "Q3g_text"      "Q4"            "Q4_5_text"     "Q5a"           "Q5b"          
[16] "Q5c"           "Q5d"           "Q5e"           "Q6a"           "Q6b"          
[21] "Q6c"           "Q6d"           "Q6e"           "Q6f"           "Q6g"          
[26] "Q6h"           "Q6i"           "Q8a"           "Q8b"           "Q8c"          
[31] "Q8d"           "Q8e"           "Q10a"          "Q10b"          "Q10c"         
[36] "Q10d"          "Q11a"          "Q11b"          "Q11c"          "Q11d"         
[41] "Q11e"          "Q11f"          "Q12a"          "Q12b"          "Q12c"         
[46] "Q12d"          "Q12e"          "Q12f"          "Q12g"          "Q12h"         
[51] "Q12i"          "Q13a"          "Q13b"          "Q13c"          "Q13d"         
[56] "Q13e"          "Q13f"          "Q13g"          "Q14a"          "Q14b"         
[61] "Q14c"          "Q14d"          "Q14e"          "Q14f"          "Q14g"         
[66] "Q15a"          "Q15b"          "Q15c"          "Q15d"          "Q15e"         
[71] "Q15f"          "Q15g"          "Q17"           "Q18"           "Q19"          
[76] "Q21"           "Q22"           "Q23"           "Q24"           "Q25a"         
[81] "Q25b"          "Q25c"          "Q25d"          "Q25e"          "Q25f"         
[86] "Q25g"          "Q25h"          "Q25i"          "Q25j"          "Q25k"         
[91] "Q25l"          "Q25l_text"     "Q26"           "cluster"       "age"          
data_cluster_profile_5 |>
  group_by(cluster, Q22) |>
  summarise(n = n(), .groups = "drop") |>
  group_by(cluster) |>
  mutate(percent = round(100 * n / sum(n), 1))
data_cluster_profile_5 |>
  group_by(cluster) |>
  summarise(Q17_mean = mean(as.numeric(Q17), na.rm = TRUE))
gender_profile_5 <- data_cluster_profile_5 |>
  group_by(cluster, Q22) |>
  summarise(n = n(), .groups = "drop") |>
  group_by(cluster) |>
  mutate(percent = round(100 * n / sum(n), 1)) |>
  ungroup()

male_profile_5 <- gender_profile_5 |>
  filter(Q22 == "1") |>
  select(cluster, male_percent = percent)

female_profile_5 <- gender_profile_5 |>
  filter(Q22 == "2") |>
  select(cluster, female_percent = percent)

profiling_table_5 <- data_cluster_profile_5 |>
  group_by(cluster) |>
  summarise(
    mean_birth_year = mean(as.numeric(Q21), na.rm = TRUE),
    mean_age = mean(age, na.rm = TRUE),
    mobile_banking_use = mean(as.numeric(Q2), na.rm = TRUE),
    trust = mean(as.numeric(Q24), na.rm = TRUE),
    Q17_mean = mean(as.numeric(Q17), na.rm = TRUE)
  ) |>
  left_join(male_profile_5, by = "cluster") |>
  left_join(female_profile_5, by = "cluster") |>
  mutate(
    cluster = factor(
      cluster,
      levels = c(1, 2, 3, 4, 5),
      labels = c(
        "Skeptical support seekers",
        "Cautious guidance seekers",
        "Feature-oriented adopters",
        "AI-resistant independents",
        "AI-enthusiastic guidance seekers"
      )
    )
  ) |>
  mutate(across(-cluster, ~ round(.x, 2)))

profiling_table_5
pc_loadings <- as.data.frame(pca_cluster$rotation[, 1:2])

pc_loadings$Variable <- rownames(pc_loadings)
rownames(pc_loadings) <- NULL

pc_loadings <- pc_loadings[, c("Variable", "PC1", "PC2")]

pc_loadings$PC1 <- round(pc_loadings$PC1, 3)
pc_loadings$PC2 <- round(pc_loadings$PC2, 3)

pc_loadings
cluster_bank_counts <- data_cluster_profile_5 |>
  group_by(cluster) |>
  summarise(
    OTP = sum(Q25a == 1, na.rm = TRUE),
    Gorenjska_Banka = sum(Q25b == 1, na.rm = TRUE),
    NLB = sum(Q25c == 1, na.rm = TRUE),
    Revolut = sum(Q25d == 1, na.rm = TRUE),
    N26 = sum(Q25e == 1, na.rm = TRUE),
    Intesa = sum(Q25f == 1, na.rm = TRUE),
    UniCredit = sum(Q25g == 1, na.rm = TRUE),
    Regional_Bank = sum(Q25h == 1, na.rm = TRUE),
    Workers_Savings = sum(Q25i == 1, na.rm = TRUE),
    Sparkasse = sum(Q25j == 1, na.rm = TRUE),
    Addiko = sum(Q25k == 1, na.rm = TRUE)
  )

cluster_bank_counts
library(dplyr)
library(tidyr)
library(ggplot2)

cluster_bank_counts <- data_cluster_profile_5 |>
  group_by(cluster) |>
  summarise(
    OTP = sum(Q25a == 1, na.rm = TRUE),
    Gorenjska_Banka = sum(Q25b == 1, na.rm = TRUE),
    NLB = sum(Q25c == 1, na.rm = TRUE),
    Revolut = sum(Q25d == 1, na.rm = TRUE),
    N26 = sum(Q25e == 1, na.rm = TRUE),
    Intesa_SanPaolo = sum(Q25f == 1, na.rm = TRUE),
    UniCredit = sum(Q25g == 1, na.rm = TRUE),
    Regional_Bank = sum(Q25h == 1, na.rm = TRUE),
    Workers_Savings = sum(Q25i == 1, na.rm = TRUE),
    Sparkasse = sum(Q25j == 1, na.rm = TRUE),
    Addiko = sum(Q25k == 1, na.rm = TRUE),
    Other = sum(Q25l == 1, na.rm = TRUE)
  )

cluster_bank_counts
cluster_bank_long <- cluster_bank_counts |>
  pivot_longer(
    cols = -cluster,
    names_to = "bank",
    values_to = "count"
  )

cluster_bank_long
ggplot(cluster_bank_long, aes(x = bank, y = factor(cluster), fill = count)) +
  geom_tile(color = "white") +
  geom_text(aes(label = count), size = 4) +
  labs(
    title = "Banks Used by Each Cluster",
    x = "Bank",
    y = "Cluster",
    fill = "Count"
  ) +
  theme_minimal() +
  theme(
    axis.text.x = element_text(angle = 45, hjust = 1)
  )

cluster_bank_percent_long <- cluster_bank_long |>
  group_by(cluster) |>
  mutate(percent = round(100 * count / sum(count), 1)) |>
  ungroup()

cluster_bank_percent_long
ggplot(cluster_bank_percent_long, aes(x = bank, y = factor(cluster), fill = percent)) +
  geom_tile(color = "white") +
  geom_text(aes(label = paste0(percent, "%")), size = 4) +
  labs(
    title = "Bank Usage by Cluster (%)",
    x = "Bank",
    y = "Cluster",
    fill = "Percent"
  ) +
  theme_minimal() +
  theme(
    axis.text.x = element_text(angle = 45, hjust = 1)
  )

library(dplyr)
library(tidyr)
library(ggplot2)

cluster_bank_counts_named <- data_cluster_profile_5 |>
  mutate(
    cluster = factor(
      cluster,
      levels = c(1, 2, 3, 4, 5),
      labels = c(
        "Skeptical support seekers",
        "Cautious guidance seekers",
        "Feature-oriented adopters",
        "AI-resistant independents",
        "AI-enthusiastic guidance seekers"
      )
    )
  ) |>
  filter(cluster %in% c(
    "Cautious guidance seekers",
    "Feature-oriented adopters",
    "AI-enthusiastic guidance seekers"
  )) |>
  group_by(cluster) |>
  summarise(
    OTP = sum(Q25a == 1, na.rm = TRUE),
    Gorenjska_Banka = sum(Q25b == 1, na.rm = TRUE),
    NLB = sum(Q25c == 1, na.rm = TRUE),
    Revolut = sum(Q25d == 1, na.rm = TRUE),
    N26 = sum(Q25e == 1, na.rm = TRUE),
    Intesa_SanPaolo = sum(Q25f == 1, na.rm = TRUE),
    UniCredit = sum(Q25g == 1, na.rm = TRUE),
    Regional_Bank = sum(Q25h == 1, na.rm = TRUE),
    Workers_Savings = sum(Q25i == 1, na.rm = TRUE),
    Sparkasse = sum(Q25j == 1, na.rm = TRUE),
    Addiko = sum(Q25k == 1, na.rm = TRUE),
    Other = sum(Q25l == 1, na.rm = TRUE)
  )

cluster_bank_percent_long_named <- cluster_bank_counts_named |>
  pivot_longer(
    cols = -cluster,
    names_to = "bank",
    values_to = "count"
  ) |>
  group_by(cluster) |>
  mutate(percent = round(100 * count / sum(count), 1)) |>
  ungroup()

ggplot(
  cluster_bank_percent_long_named,
  aes(x = bank, y = cluster, fill = percent)
) +
  geom_tile(color = "white") +
  geom_text(aes(label = paste0(percent, "%")), color = "white", size = 4) +
  labs(
    title = "Bank Usage by Selected Clusters (%)",
    x = "Bank",
    y = "Cluster",
    fill = "Percent"
  ) +
  theme_minimal() +
  theme(
    axis.text.x = element_text(angle = 45, hjust = 1)
  )

library(dplyr)
library(tibble)
library(FactoMineR)
library(factoextra)
library(ggplot2)

data_cluster_profile_5 <- data_clean_complete |>
  mutate(cluster = factor(k5_pca2$cluster))

make_perception_map <- function(data, cluster_values, title_text) {
  
  subset_data <- data |>
    filter(cluster %in% cluster_values) |>
    mutate(
      across(Q13a:Q15g, as.numeric)
    )
  
  bank_means <- tibble(
    bank = c("OTP", "Gorenjska Banka", "NLB", "Revolut", "N26", "Intesa SanPaolo", "UniCredit"),
    innovation = c(
      mean(subset_data$Q13a, na.rm = TRUE),
      mean(subset_data$Q13b, na.rm = TRUE),
      mean(subset_data$Q13c, na.rm = TRUE),
      mean(subset_data$Q13d, na.rm = TRUE),
      mean(subset_data$Q13e, na.rm = TRUE),
      mean(subset_data$Q13f, na.rm = TRUE),
      mean(subset_data$Q13g, na.rm = TRUE)
    ),
    customer_support = c(
      mean(subset_data$Q14a, na.rm = TRUE),
      mean(subset_data$Q14b, na.rm = TRUE),
      mean(subset_data$Q14c, na.rm = TRUE),
      mean(subset_data$Q14d, na.rm = TRUE),
      mean(subset_data$Q14e, na.rm = TRUE),
      mean(subset_data$Q14f, na.rm = TRUE),
      mean(subset_data$Q14g, na.rm = TRUE)
    ),
    reliability = c(
      mean(subset_data$Q15a, na.rm = TRUE),
      mean(subset_data$Q15b, na.rm = TRUE),
      mean(subset_data$Q15c, na.rm = TRUE),
      mean(subset_data$Q15d, na.rm = TRUE),
      mean(subset_data$Q15e, na.rm = TRUE),
      mean(subset_data$Q15f, na.rm = TRUE),
      mean(subset_data$Q15g, na.rm = TRUE)
    )
  )
  
  mat <- bank_means |>
    column_to_rownames("bank") |>
    as.matrix()
  
  pca_bank <- FactoMineR::PCA(mat, scale.unit = TRUE, graph = FALSE)
  
  factoextra::fviz_pca_biplot(
    pca_bank,
    repel = TRUE,
    col.var = "gray30"
  ) +
    ggplot2::ggtitle(title_text) +
    ggplot2::xlab("Dim1: Overall Digital Banking Performance") +
    ggplot2::ylab("Dim2: Customer Support vs Innovation")
}
make_perception_map(
  data = data_cluster_profile_5,
  cluster_values = c("2"),
  title_text = "Perceptual Map of Banks - Cluster 2"
)

make_perception_map(
  data = data_cluster_profile_5,
  cluster_values = c("3"),
  title_text = "Perceptual Map of Banks - Cluster 3"
)

make_perception_map(
  data = data_cluster_profile_5,
  cluster_values = c("5"),
  title_text = "Perceptual Map of Banks - Cluster 5"
)

make_perception_map(
  data = data_cluster_profile_5,
  cluster_values = c("2", "3", "5"),
  title_text = "Perceptual Map of Banks - Clusters 2, 3, and 5"
)

library(dplyr)
library(tidyr)
library(ggplot2)

cluster_q4_table_named <- data_cluster_profile_5 |>
  mutate(
    cluster = factor(
      cluster,
      levels = c(1, 2, 3, 4, 5),
      labels = c(
        "Skeptical support seekers",
        "Cautious guidance seekers",
        "Feature-oriented adopters",
        "AI-resistant independents",
        "AI-enthusiastic guidance seekers"
      )
    )
  ) |>
  filter(cluster %in% c(
    "Cautious guidance seekers",
    "Feature-oriented adopters",
    "AI-enthusiastic guidance seekers"
  )) |>
  group_by(cluster, Q4) |>
  summarise(n = n(), .groups = "drop") |>
  group_by(cluster) |>
  mutate(percent = round(100 * n / sum(n), 1)) |>
  ungroup() |>
  mutate(
    info_source = case_when(
      Q4 == "1" ~ "Web browsers",
      Q4 == "2" ~ "Family / friends",
      Q4 == "3" ~ "Financial media",
      Q4 == "4" ~ "ChatGPT / AI models",
      Q4 == "5" ~ "Other",
      TRUE ~ as.character(Q4)
    )
  ) |>
  select(cluster, info_source, n, percent)

cluster_q4_table_named
ggplot(cluster_q4_table_named, aes(x = info_source, y = cluster, fill = percent)) +
  geom_tile(color = "white") +
  geom_text(aes(label = paste0(percent, "%")), color = "white", size = 4) +
  labs(
    title = "Information Source by Selected Clusters (%)",
    x = "Information Source",
    y = "Cluster",
    fill = "Percent"
  ) +
  theme_minimal() +
  theme(
    axis.text.x = element_text(angle = 45, hjust = 1)
  )

cluster_q4_wide <- cluster_q4_table_named |>
  select(cluster, info_source, percent) |>
  pivot_wider(
    names_from = info_source,
    values_from = percent,
    values_fill = 0
  )

cluster_q4_wide
library(dplyr)

cluster_vars <- c(
  "Q6a", "Q6b", "Q6d", "Q6e", "Q6h", "Q6i",
  "Q8a", "Q8b", "Q8c", "Q8d", "Q8e"
)

cluster_validation <- data_clean |>
  filter(
    !is.na(Q6a), !is.na(Q6b), !is.na(Q6d), !is.na(Q6e), !is.na(Q6h), !is.na(Q6i),
    !is.na(Q8a), !is.na(Q8b), !is.na(Q8c), !is.na(Q8d), !is.na(Q8e)
  ) |>
  mutate(
    cluster = factor(k5_pca2$cluster),
    across(all_of(cluster_vars), as.numeric)
  )
anova_results <- lapply(cluster_vars, function(var) {
  model <- aov(as.formula(paste(var, "~ cluster")), data = cluster_validation)
  data.frame(
    variable = var,
    p_value = summary(model)[[1]][["Pr(>F)"]][1]
  )
})

anova_results <- do.call(rbind, anova_results)
anova_results$p_adjusted <- p.adjust(anova_results$p_value, method = "holm")

anova_results
cluster_means_validation <- cluster_validation |>
  group_by(cluster) |>
  summarise(
    across(all_of(cluster_vars), ~ mean(.x, na.rm = TRUE)),
    .groups = "drop"
  )

cluster_means_validation
library(dplyr)

age_data <- data_clean |>
  filter(
    !is.na(Q6a), !is.na(Q6b), !is.na(Q6d), !is.na(Q6e), !is.na(Q6h), !is.na(Q6i),
    !is.na(Q8a), !is.na(Q8b), !is.na(Q8c), !is.na(Q8d), !is.na(Q8e)
  ) |>
  mutate(
    cluster = factor(
      k5_pca2$cluster,
      levels = c(1, 2, 3, 4, 5),
      labels = c(
        "Skeptical support seekers",
        "Cautious guidance seekers",
        "Feature-oriented adopters",
        "AI-resistant independents",
        "AI-enthusiastic guidance seekers"
      )
    )
  ) |>
  filter(!is.na(Q21)) |>
  mutate(
    age = 2026 - as.numeric(Q21)
  )
age_summary <- age_data |>
  group_by(cluster) |>
  summarise(
    n = n(),
    mean_age = mean(age, na.rm = TRUE),
    sd_age = sd(age, na.rm = TRUE),
    median_age = median(age, na.rm = TRUE),
    min_age = min(age, na.rm = TRUE),
    max_age = max(age, na.rm = TRUE)
  )

age_summary
age_anova <- aov(age ~ cluster, data = age_data)
summary(age_anova)
             Df Sum Sq Mean Sq F value   Pr(>F)    
cluster       4  11950  2987.6   12.44 2.09e-09 ***
Residuals   316  75907   240.2                     
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1
TukeyHSD(age_anova)
  Tukey multiple comparisons of means
    95% family-wise confidence level

Fit: aov(formula = age ~ cluster, data = age_data)

$cluster
                                                                  diff         lwr
Cautious guidance seekers-Skeptical support seekers         -7.5313131 -14.6825056
Feature-oriented adopters-Skeptical support seekers          2.1517677  -5.4632570
AI-resistant independents-Skeptical support seekers         10.4484848   1.0853761
AI-enthusiastic guidance seekers-Skeptical support seekers  -8.2035191 -16.0800102
Feature-oriented adopters-Cautious guidance seekers          9.6830808   3.0969363
AI-resistant independents-Cautious guidance seekers         17.9797980   9.4324882
AI-enthusiastic guidance seekers-Cautious guidance seekers  -0.6722059  -7.5589912
AI-resistant independents-Feature-oriented adopters          8.2967172  -0.6422734
AI-enthusiastic guidance seekers-Feature-oriented adopters -10.3552867 -17.7225697
AI-enthusiastic guidance seekers-AI-resistant independents -18.6520039 -27.8147581
                                                                  upr     p adj
Cautious guidance seekers-Skeptical support seekers        -0.3801207 0.0333606
Feature-oriented adopters-Skeptical support seekers         9.7667923 0.9375949
AI-resistant independents-Skeptical support seekers        19.8115936 0.0200832
AI-enthusiastic guidance seekers-Skeptical support seekers -0.3270279 0.0365232
Feature-oriented adopters-Cautious guidance seekers        16.2692253 0.0006548
AI-resistant independents-Cautious guidance seekers        26.5271078 0.0000002
AI-enthusiastic guidance seekers-Cautious guidance seekers  6.2145793 0.9988664
AI-resistant independents-Feature-oriented adopters        17.2357077 0.0831926
AI-enthusiastic guidance seekers-Feature-oriented adopters -2.9880037 0.0013076
AI-enthusiastic guidance seekers-AI-resistant independents -9.4892498 0.0000005
age_summary <- age_data |>
  group_by(cluster) |>
  summarise(
    n = n(),
    mean_age = mean(age, na.rm = TRUE),
    sd_age = sd(age, na.rm = TRUE),
    median_age = median(age, na.rm = TRUE),
    min_age = min(age, na.rm = TRUE),
    max_age = max(age, na.rm = TRUE)
  )

age_summary
age_summary
library(dplyr)

gender_data <- data_clean |>
  filter(
    !is.na(Q6a), !is.na(Q6b), !is.na(Q6d), !is.na(Q6e), !is.na(Q6h), !is.na(Q6i),
    !is.na(Q8a), !is.na(Q8b), !is.na(Q8c), !is.na(Q8d), !is.na(Q8e)
  ) |>
  mutate(
    cluster = factor(
      k5_pca2$cluster,
      levels = c(1, 2, 3, 4, 5),
      labels = c(
        "Skeptical support seekers",
        "Cautious guidance seekers",
        "Feature-oriented adopters",
        "AI-resistant independents",
        "AI-enthusiastic guidance seekers"
      )
    )
  ) |>
  filter(!is.na(Q22)) |>
  mutate(
    gender = factor(
      Q22,
      levels = c("1", "2"),
      labels = c("Male", "Female")
    )
  )
gender_table <- table(gender_data$cluster, gender_data$gender)
gender_table
                                  
                                   Male Female
  Skeptical support seekers          39     16
  Cautious guidance seekers          52     46
  Feature-oriented adopters          35     38
  AI-resistant independents          14     19
  AI-enthusiastic guidance seekers   33     29
gender_chisq <- chisq.test(gender_table)
gender_chisq

    Pearson's Chi-squared test

data:  gender_table
X-squared = 9.2334, df = 4, p-value = 0.05552
gender_chisq$expected
                                  
                                       Male   Female
  Skeptical support seekers        29.64174 25.35826
  Cautious guidance seekers        52.81620 45.18380
  Feature-oriented adopters        39.34268 33.65732
  AI-resistant independents        17.78505 15.21495
  AI-enthusiastic guidance seekers 33.41433 28.58567
library(dplyr)

mobile_data <- data_clean |>
  filter(
    !is.na(Q6a), !is.na(Q6b), !is.na(Q6d), !is.na(Q6e), !is.na(Q6h), !is.na(Q6i),
    !is.na(Q8a), !is.na(Q8b), !is.na(Q8c), !is.na(Q8d), !is.na(Q8e)
  ) |>
  mutate(
    cluster = factor(
      k5_pca2$cluster,
      levels = c(1, 2, 3, 4, 5),
      labels = c(
        "Skeptical support seekers",
        "Cautious guidance seekers",
        "Feature-oriented adopters",
        "AI-resistant independents",
        "AI-enthusiastic guidance seekers"
      )
    )
  ) |>
  filter(!is.na(Q2)) |>
  mutate(
    mobile_banking_use = as.numeric(Q2)
  )
mobile_data <- data_clean |>
  filter(
    !is.na(Q6a), !is.na(Q6b), !is.na(Q6d), !is.na(Q6e), !is.na(Q6h), !is.na(Q6i),
    !is.na(Q8a), !is.na(Q8b), !is.na(Q8c), !is.na(Q8d), !is.na(Q8e)
  ) |>
  mutate(
    cluster = factor(
      k5_pca2$cluster,
      levels = c(1, 2, 3, 4, 5),
      labels = c(
        "Skeptical support seekers",
        "Cautious guidance seekers",
        "Feature-oriented adopters",
        "AI-resistant independents",
        "AI-enthusiastic guidance seekers"
      )
    ),
    mobile_banking_use = as.numeric(Q2),
    mobile_banking_use = ifelse(mobile_banking_use == -2, NA, mobile_banking_use)
  ) |>
  filter(!is.na(mobile_banking_use))
table(mobile_data$mobile_banking_use)

  1   2   3   4 
 72 112 105  20 
mobile_data |>
  count(cluster, mobile_banking_use)
mobile_summary <- mobile_data |>
  group_by(cluster) |>
  summarise(
    n = n(),
    mean_mobile_use = mean(mobile_banking_use, na.rm = TRUE),
    sd_mobile_use = sd(mobile_banking_use, na.rm = TRUE),
    median_mobile_use = median(mobile_banking_use, na.rm = TRUE),
    min_mobile_use = min(mobile_banking_use, na.rm = TRUE),
    max_mobile_use = max(mobile_banking_use, na.rm = TRUE)
  )

mobile_summary
mobile_kw <- kruskal.test(mobile_banking_use ~ cluster, data = mobile_data)
mobile_kw

    Kruskal-Wallis rank sum test

data:  mobile_banking_use by cluster
Kruskal-Wallis chi-squared = 6.9046, df = 4, p-value = 0.141
library(dplyr)

education_data <- data_clean |>
  filter(
    !is.na(Q6a), !is.na(Q6b), !is.na(Q6d), !is.na(Q6e), !is.na(Q6h), !is.na(Q6i),
    !is.na(Q8a), !is.na(Q8b), !is.na(Q8c), !is.na(Q8d), !is.na(Q8e)
  ) |>
  mutate(
    cluster = factor(
      k5_pca2$cluster,
      levels = c(1,2,3,4,5),
      labels = c(
        "Skeptical support seekers",
        "Cautious guidance seekers",
        "Feature-oriented adopters",
        "AI-resistant independents",
        "AI-enthusiastic guidance seekers"
      )
    ),
    education = as.numeric(Q24)
  ) |>
  filter(!is.na(education))
table(education_data$education)

  3   4   5   6   7   8 
 98  34  56 104  26   2 
education_data |>
  count(cluster, education)
education_table <- table(education_data$cluster, education_data$education)

education_table
                                  
                                    3  4  5  6  7  8
  Skeptical support seekers        15  2 14 18  6  0
  Cautious guidance seekers        34 14 12 33  5  1
  Feature-oriented adopters        20  9 12 23  8  0
  AI-resistant independents         9  6  5 12  1  0
  AI-enthusiastic guidance seekers 20  3 13 18  6  1
education_chisq <- chisq.test(education_table)

education_chisq

    Pearson's Chi-squared test

data:  education_table
X-squared = 19.208, df = 20, p-value = 0.5083
education_chisq$expected
                                  
                                          3        4      5      6       7       8
  Skeptical support seekers        16.84375  5.84375  9.625 17.875 4.46875 0.34375
  Cautious guidance seekers        30.31875 10.51875 17.325 32.175 8.04375 0.61875
  Feature-oriented adopters        22.05000  7.65000 12.600 23.400 5.85000 0.45000
  AI-resistant independents        10.10625  3.50625  5.775 10.725 2.68125 0.20625
  AI-enthusiastic guidance seekers 18.68125  6.48125 10.675 19.825 4.95625 0.38125
table(education_data$education)

  3   4   5   6   7   8 
 98  34  56 104  26   2 
education_table
                                  
                                    3  4  5  6  7  8
  Skeptical support seekers        15  2 14 18  6  0
  Cautious guidance seekers        34 14 12 33  5  1
  Feature-oriented adopters        20  9 12 23  8  0
  AI-resistant independents         9  6  5 12  1  0
  AI-enthusiastic guidance seekers 20  3 13 18  6  1
education_chisq

    Pearson's Chi-squared test

data:  education_table
X-squared = 19.208, df = 20, p-value = 0.5083
income_data <- data_clean |>
  filter(
    !is.na(Q6a), !is.na(Q6b), !is.na(Q6d), !is.na(Q6e), !is.na(Q6h), !is.na(Q6i),
    !is.na(Q8a), !is.na(Q8b), !is.na(Q8c), !is.na(Q8d), !is.na(Q8e)
  ) |>
  mutate(
    cluster = factor(
      k5_pca2$cluster,
      levels = c(1,2,3,4,5),
      labels = c(
        "Skeptical support seekers",
        "Cautious guidance seekers",
        "Feature-oriented adopters",
        "AI-resistant independents",
        "AI-enthusiastic guidance seekers"
      )
    ),
    income = as.numeric(Q26)
  ) |>
  filter(!is.na(income))
table(income_data$income)

 1  2  3  4  5  6  7  8 
43 43 58 64 49 31 12 20 
income_data |>
  count(cluster, income)
income_table <- table(income_data$cluster, income_data$income)

income_table
                                  
                                    1  2  3  4  5  6  7  8
  Skeptical support seekers         8  4 14 11 10  2  1  5
  Cautious guidance seekers        23 18 15 20  7  8  4  3
  Feature-oriented adopters         5  7 10 13 19  8  4  6
  AI-resistant independents         1  6  8  6  3  5  0  4
  AI-enthusiastic guidance seekers  6  8 11 14 10  8  3  2
income_chisq <- chisq.test(income_table)

income_chisq

    Pearson's Chi-squared test

data:  income_table
X-squared = 44.967, df = 28, p-value = 0.02223
income_chisq$expected
                                  
                                           1         2        3    4         5
  Skeptical support seekers         7.390625  7.390625  9.96875 11.0  8.421875
  Cautious guidance seekers        13.168750 13.168750 17.76250 19.6 15.006250
  Feature-oriented adopters         9.675000  9.675000 13.05000 14.4 11.025000
  AI-resistant independents         4.434375  4.434375  5.98125  6.6  5.053125
  AI-enthusiastic guidance seekers  8.331250  8.331250 11.23750 12.4  9.493750
                                  
                                          6      7      8
  Skeptical support seekers        5.328125 2.0625 3.4375
  Cautious guidance seekers        9.493750 3.6750 6.1250
  Feature-oriented adopters        6.975000 2.7000 4.5000
  AI-resistant independents        3.196875 1.2375 2.0625
  AI-enthusiastic guidance seekers 6.006250 2.3250 3.8750
table(income_data$income)

 1  2  3  4  5  6  7  8 
43 43 58 64 49 31 12 20 
income_table
                                  
                                    1  2  3  4  5  6  7  8
  Skeptical support seekers         8  4 14 11 10  2  1  5
  Cautious guidance seekers        23 18 15 20  7  8  4  3
  Feature-oriented adopters         5  7 10 13 19  8  4  6
  AI-resistant independents         1  6  8  6  3  5  0  4
  AI-enthusiastic guidance seekers  6  8 11 14 10  8  3  2
income_chisq

    Pearson's Chi-squared test

data:  income_table
X-squared = 44.967, df = 28, p-value = 0.02223
income_data_grouped <- data_clean |>
  filter(
    !is.na(Q6a), !is.na(Q6b), !is.na(Q6d), !is.na(Q6e), !is.na(Q6h), !is.na(Q6i),
    !is.na(Q8a), !is.na(Q8b), !is.na(Q8c), !is.na(Q8d), !is.na(Q8e)
  ) |>
  mutate(
    cluster = factor(
      k5_pca2$cluster,
      levels = c(1, 2, 3, 4, 5),
      labels = c(
        "Skeptical support seekers",
        "Cautious guidance seekers",
        "Feature-oriented adopters",
        "AI-resistant independents",
        "AI-enthusiastic guidance seekers"
      )
    ),
    income = as.numeric(Q26),
    income_group = case_when(
      income %in% c(1, 2) ~ "Low income (0–999€)",
      income %in% c(3, 4) ~ "Lower-middle income (1000–1999€)",
      income %in% c(5, 6) ~ "Upper-middle income (2000–2999€)",
      income %in% c(7, 8) ~ "High income (3000€+)",
      TRUE ~ NA_character_
    )
  ) |>
  filter(!is.na(income_group))
table(income_data_grouped$income_group)

            High income (3000€+)              Low income (0–999€) 
                              32                               86 
Lower-middle income (1000–1999€) Upper-middle income (2000–2999€) 
                             122                               80 
income_data_grouped |>
  count(cluster, income_group)
income_group_table <- table(
  income_data_grouped$cluster,
  income_data_grouped$income_group
)

income_group_table
                                  
                                   High income (3000€+) Low income (0–999€)
  Skeptical support seekers                           6                  12
  Cautious guidance seekers                           7                  41
  Feature-oriented adopters                          10                  12
  AI-resistant independents                           4                   7
  AI-enthusiastic guidance seekers                    5                  14
                                  
                                   Lower-middle income (1000–1999€)
  Skeptical support seekers                                      25
  Cautious guidance seekers                                      35
  Feature-oriented adopters                                      23
  AI-resistant independents                                      14
  AI-enthusiastic guidance seekers                               25
                                  
                                   Upper-middle income (2000–2999€)
  Skeptical support seekers                                      12
  Cautious guidance seekers                                      15
  Feature-oriented adopters                                      27
  AI-resistant independents                                       8
  AI-enthusiastic guidance seekers                               18
income_group_chisq <- chisq.test(income_group_table)

income_group_chisq

    Pearson's Chi-squared test

data:  income_group_table
X-squared = 25.314, df = 12, p-value = 0.0134
income_group_chisq$expected
                                  
                                   High income (3000€+) Low income (0–999€)
  Skeptical support seekers                         5.5            14.78125
  Cautious guidance seekers                         9.8            26.33750
  Feature-oriented adopters                         7.2            19.35000
  AI-resistant independents                         3.3             8.86875
  AI-enthusiastic guidance seekers                  6.2            16.66250
                                  
                                   Lower-middle income (1000–1999€)
  Skeptical support seekers                                20.96875
  Cautious guidance seekers                                37.36250
  Feature-oriented adopters                                27.45000
  AI-resistant independents                                12.58125
  AI-enthusiastic guidance seekers                         23.63750
                                  
                                   Upper-middle income (2000–2999€)
  Skeptical support seekers                                   13.75
  Cautious guidance seekers                                   24.50
  Feature-oriented adopters                                   18.00
  AI-resistant independents                                    8.25
  AI-enthusiastic guidance seekers                            15.50
income_profile <- income_data_grouped |>
  count(cluster, income_group) |>
  group_by(cluster) |>
  mutate(percent = round(100 * n / sum(n), 1)) |>
  ungroup()

income_profile
income_profile_wide <- income_profile |>
  select(cluster, income_group, percent) |>
  tidyr::pivot_wider(
    names_from = income_group,
    values_from = percent,
    values_fill = 0
  )

income_profile_wide
bank_data <- data_clean |>
  filter(
    !is.na(Q6a), !is.na(Q6b), !is.na(Q6d), !is.na(Q6e), !is.na(Q6h), !is.na(Q6i),
    !is.na(Q8a), !is.na(Q8b), !is.na(Q8c), !is.na(Q8d), !is.na(Q8e)
  ) |>
  mutate(
    cluster = factor(
      k5_pca2$cluster,
      levels = c(1,2,3,4,5),
      labels = c(
        "Skeptical support seekers",
        "Cautious guidance seekers",
        "Feature-oriented adopters",
        "AI-resistant independents",
        "AI-enthusiastic guidance seekers"
      )
    )
  )
bank_data <- bank_data |>
  mutate(
    across(Q25a:Q25l, ~ as.numeric(.))
  )
revolut_table <- table(bank_data$cluster, bank_data$Q25d)

revolut_table
                                  
                                    0  1
  Skeptical support seekers        44 12
  Cautious guidance seekers        68 31
  Feature-oriented adopters        55 18
  AI-resistant independents        28  4
  AI-enthusiastic guidance seekers 43 19
chisq.test(revolut_table)

    Pearson's Chi-squared test

data:  revolut_table
X-squared = 5.8418, df = 4, p-value = 0.2113
banks <- c("Q25a","Q25b","Q25c","Q25d","Q25e","Q25f","Q25g","Q25h","Q25i","Q25j","Q25k","Q25l")

bank_tests <- lapply(banks, function(var){

  tab <- table(bank_data$cluster, bank_data[[var]])
  test <- chisq.test(tab)

  data.frame(
    bank = var,
    chi_square = test$statistic,
    p_value = test$p.value
  )
})

bank_tests <- do.call(rbind, bank_tests)

bank_tests
otp_profile <- bank_data |>
  group_by(cluster) |>
  summarise(
    otp_users = sum(Q25a == 1, na.rm = TRUE),
    n = n(),
    otp_percent = round(100 * otp_users / n, 1)
  )

otp_profile
area_data <- data_clean |>
  filter(
    !is.na(Q6a), !is.na(Q6b), !is.na(Q6d), !is.na(Q6e), !is.na(Q6h), !is.na(Q6i),
    !is.na(Q8a), !is.na(Q8b), !is.na(Q8c), !is.na(Q8d), !is.na(Q8e)
  ) |>
  mutate(
    cluster = factor(
      k5_pca2$cluster,
      levels = c(1,2,3,4,5),
      labels = c(
        "Skeptical support seekers",
        "Cautious guidance seekers",
        "Feature-oriented adopters",
        "AI-resistant independents",
        "AI-enthusiastic guidance seekers"
      )
    ),
    area = as.numeric(Q23)
  ) |>
  filter(!is.na(area))
table(area_data$area)

  1   2   3 
185  68  70 
area_table <- table(area_data$cluster, area_data$area)

area_table
                                  
                                    1  2  3
  Skeptical support seekers        36 11  9
  Cautious guidance seekers        57 22 20
  Feature-oriented adopters        38 15 20
  AI-resistant independents        15  7 11
  AI-enthusiastic guidance seekers 39 13 10
area_chisq <- chisq.test(area_table)

area_chisq

    Pearson's Chi-squared test

data:  area_table
X-squared = 7.067, df = 8, p-value = 0.5294
area_chisq$expected
                                  
                                          1         2         3
  Skeptical support seekers        32.07430 11.789474 12.136223
  Cautious guidance seekers        56.70279 20.842105 21.455108
  Feature-oriented adopters        41.81115 15.368421 15.820433
  AI-resistant independents        18.90093  6.947368  7.151703
  AI-enthusiastic guidance seekers 35.51084 13.052632 13.436533
area_profile <- area_data |>
  count(cluster, area) |>
  group_by(cluster) |>
  mutate(percent = round(100 * n / sum(n), 1))

area_profile
area_profile <- area_data |>
  count(cluster, area) |>
  group_by(cluster) |>
  mutate(percent = round(100 * n / sum(n), 1)) |>
  ungroup()

area_profile
ai_data <- data_clean |>
  filter(
    !is.na(Q6a), !is.na(Q6b), !is.na(Q6d), !is.na(Q6e), !is.na(Q6h), !is.na(Q6i),
    !is.na(Q8a), !is.na(Q8b), !is.na(Q8c), !is.na(Q8d), !is.na(Q8e)
  ) |>
  mutate(
    cluster = factor(
      k5_pca2$cluster,
      levels = c(1,2,3,4,5),
      labels = c(
        "Skeptical support seekers",
        "Cautious guidance seekers",
        "Feature-oriented adopters",
        "AI-resistant independents",
        "AI-enthusiastic guidance seekers"
      )
    ),
    ai_use = as.numeric(Q17)
  ) |>
  filter(!is.na(ai_use))
ai_summary <- ai_data |>
  group_by(cluster) |>
  summarise(
    n = n(),
    mean_ai = mean(ai_use),
    sd_ai = sd(ai_use),
    median_ai = median(ai_use),
    min_ai = min(ai_use),
    max_ai = max(ai_use)
  )

ai_summary
ai_anova <- aov(ai_use ~ cluster, data = ai_data)

summary(ai_anova)
             Df Sum Sq Mean Sq F value Pr(>F)    
cluster       4  302.8   75.71    33.2 <2e-16 ***
Residuals   294  670.4    2.28                   
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1
TukeyHSD(ai_anova)
  Tukey multiple comparisons of means
    95% family-wise confidence level

Fit: aov(formula = ai_use ~ cluster, data = ai_data)

$cluster
                                                                 diff         lwr
Cautious guidance seekers-Skeptical support seekers         1.1444444  0.41801040
Feature-oriented adopters-Skeptical support seekers         1.9019608  1.13419826
AI-resistant independents-Skeptical support seekers        -0.5000000 -1.45365166
AI-enthusiastic guidance seekers-Skeptical support seekers  2.5500000  1.76060613
Feature-oriented adopters-Cautious guidance seekers         0.7575163  0.09155992
AI-resistant independents-Cautious guidance seekers        -1.6444444 -2.51822367
AI-enthusiastic guidance seekers-Cautious guidance seekers  1.4055556  0.71477242
AI-resistant independents-Feature-oriented adopters        -2.4019608 -3.31038966
AI-enthusiastic guidance seekers-Feature-oriented adopters  0.6480392 -0.08608217
AI-enthusiastic guidance seekers-AI-resistant independents  3.0500000  2.12321717
                                                                  upr     p adj
Cautious guidance seekers-Skeptical support seekers         1.8708785 0.0002027
Feature-oriented adopters-Skeptical support seekers         2.6697233 0.0000000
AI-resistant independents-Skeptical support seekers         0.4536517 0.6028939
AI-enthusiastic guidance seekers-Skeptical support seekers  3.3393939 0.0000000
Feature-oriented adopters-Cautious guidance seekers         1.4234728 0.0167712
AI-resistant independents-Cautious guidance seekers        -0.7706652 0.0000044
AI-enthusiastic guidance seekers-Cautious guidance seekers  2.0963387 0.0000005
AI-resistant independents-Feature-oriented adopters        -1.4935319 0.0000000
AI-enthusiastic guidance seekers-Feature-oriented adopters  1.3821606 0.1120779
AI-enthusiastic guidance seekers-AI-resistant independents  3.9767828 0.0000000
ai_summary
summary(ai_anova)
             Df Sum Sq Mean Sq F value Pr(>F)    
cluster       4  302.8   75.71    33.2 <2e-16 ***
Residuals   294  670.4    2.28                   
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1
# =========================================================
# HYPOTHESIS TEST – H1c
# Q17: Likelihood of using the AI personal banking agent
# =========================================================

# H0 (Null Hypothesis):
# There are no statistically significant differences in the likelihood
# of using the AI personal banking agent (Q17) between the clusters.

# H1c (Research Hypothesis):
# Feature-oriented adopters are more likely to use the AI personal
# banking agent than cautious guidance seekers.

# =========================================================
# 1 LOAD LIBRARIES
# =========================================================

library(dplyr)
library(ggplot2)

# =========================================================
# 2 PREPARE DATA
# =========================================================

# ensure cluster variable is factor
data_cluster_profile_5$cluster <- as.factor(data_cluster_profile_5$cluster)

# convert Q17 to numeric (Likert scale)
data_cluster_profile_5 <- data_cluster_profile_5 %>%
  mutate(Q17 = as.numeric(Q17))

# =========================================================
# 3 DESCRIPTIVE STATISTICS FOR EACH CLUSTER
# =========================================================

cluster_summary_Q17 <- data_cluster_profile_5 %>%
  group_by(cluster) %>%
  summarise(
    n = n(),
    mean = mean(Q17, na.rm = TRUE),
    median = median(Q17, na.rm = TRUE),
    sd = sd(Q17, na.rm = TRUE),
    min = min(Q17, na.rm = TRUE),
    max = max(Q17, na.rm = TRUE)
  )

print(cluster_summary_Q17)

# =========================================================
# 4 TEST DIFFERENCES BETWEEN CLUSTERS
# Kruskal–Wallis test (appropriate for Likert data)
# =========================================================

kruskal_test_Q17 <- kruskal.test(Q17 ~ cluster, data = data_cluster_profile_5)

print(kruskal_test_Q17)

    Kruskal-Wallis rank sum test

data:  Q17 by cluster
Kruskal-Wallis chi-squared = 91.782, df = 4, p-value < 2.2e-16
# =========================================================
# 5 POST-HOC TEST (PAIRWISE COMPARISON)
# =========================================================

pairwise_results_Q17 <- pairwise.wilcox.test(
  data_cluster_profile_5$Q17,
  data_cluster_profile_5$cluster,
  p.adjust.method = "bonferroni"
)

print(pairwise_results_Q17)

    Pairwise comparisons using Wilcoxon rank sum test with continuity correction 

data:  data_cluster_profile_5$Q17 and data_cluster_profile_5$cluster 

  1       2       3       4      
2 0.00079 -       -       -      
3 2.9e-07 0.00433 -       -      
4 1.00000 0.00014 1.3e-06 -      
5 1.1e-10 1.7e-08 0.03730 6.8e-09

P value adjustment method: bonferroni 
# =========================================================
# 6 VISUALIZATION
# =========================================================

ggplot(data_cluster_profile_5, aes(x = cluster, y = Q17)) +
  geom_boxplot() +
  labs(
    title = "Likelihood of Using AI Personal Banking Agent by Cluster",
    x = "Cluster",
    y = "Likelihood of Use (Q17)"
  ) +
  theme_minimal()

# =========================================================
# 4b EFFECT SIZE FOR KRUSKAL-WALLIS
# =========================================================

library(rstatix)

effect_size_Q17 <- data_cluster_profile_5 %>%
  kruskal_effsize(Q17 ~ cluster)

print(effect_size_Q17)
# =====================================================
# ASSUMPTION CHECKS – H1c
# =====================================================

shapiro.test(data_cluster_profile_5$Q17)

    Shapiro-Wilk normality test

data:  data_cluster_profile_5$Q17
W = 0.90384, p-value = 7.189e-13
ggplot(data_cluster_profile_5, aes(x = Q17)) +
  geom_histogram(binwidth = 1) +
  theme_minimal()


qqnorm(data_cluster_profile_5$Q17)
qqline(data_cluster_profile_5$Q17)


library(rstatix)

levene_test(Q17 ~ cluster, data = data_cluster_profile_5)

# =====================================================
# KRUSKAL-WALLIS TEST
# =====================================================

kruskal.test(Q17 ~ cluster, data = data_cluster_profile_5)

    Kruskal-Wallis rank sum test

data:  Q17 by cluster
Kruskal-Wallis chi-squared = 91.782, df = 4, p-value < 2.2e-16

##H1e

# =========================================================
# HYPOTHESIS TEST
# Q12g – Preference for human interaction
# =========================================================

# H0 (Null Hypothesis):
# There are no statistically significant differences in preference
# for human interaction (Q12g) between the clusters.

# H1 (Research Hypothesis):
# Cautious guidance seekers show a higher preference for human
# interaction than AI-enthusiastic guidance seekers and
# feature-oriented adopters.

# =========================================================
# 1 LOAD LIBRARIES
# =========================================================

library(dplyr)
library(ggplot2)

# =========================================================
# 2 PREPARE DATA
# =========================================================

# ensure cluster variable is factor
data_cluster_profile_5$cluster <- as.factor(data_cluster_profile_5$cluster)

# convert Likert variable to numeric
data_cluster_profile_5 <- data_cluster_profile_5 %>%
  mutate(Q12g = as.numeric(Q12g))

# =========================================================
# 3 DESCRIPTIVE STATISTICS FOR EACH CLUSTER
# =========================================================

cluster_summary <- data_cluster_profile_5 %>%
  group_by(cluster) %>%
  summarise(
    n = n(),
    mean = mean(Q12g, na.rm = TRUE),
    median = median(Q12g, na.rm = TRUE),
    sd = sd(Q12g, na.rm = TRUE),
    min = min(Q12g, na.rm = TRUE),
    max = max(Q12g, na.rm = TRUE)
  )

print(cluster_summary)

# =========================================================
# 4 TEST DIFFERENCES BETWEEN CLUSTERS
# Kruskal–Wallis test (appropriate for Likert scale)
# =========================================================

kruskal_test <- kruskal.test(Q12g ~ cluster, data = data_cluster_profile_5)

print(kruskal_test)

    Kruskal-Wallis rank sum test

data:  Q12g by cluster
Kruskal-Wallis chi-squared = 13.865, df = 4, p-value = 0.007737
# =========================================================
# 5 POST-HOC TEST (PAIRWISE COMPARISON BETWEEN CLUSTERS)
# =========================================================

pairwise_results <- pairwise.wilcox.test(
  data_cluster_profile_5$Q12g,
  data_cluster_profile_5$cluster,
  p.adjust.method = "bonferroni"
)

print(pairwise_results)

    Pairwise comparisons using Wilcoxon rank sum test with continuity correction 

data:  data_cluster_profile_5$Q12g and data_cluster_profile_5$cluster 

  1      2      3      4     
2 1.0000 -      -      -     
3 0.1240 0.3440 -      -     
4 1.0000 1.0000 1.0000 -     
5 1.0000 0.6375 0.0046 1.0000

P value adjustment method: bonferroni 
# =========================================================
# 6 VISUALIZATION OF DIFFERENCES BETWEEN CLUSTERS
# =========================================================

ggplot(data_cluster_profile_5, aes(x = cluster, y = Q12g)) +
  geom_boxplot() +
  labs(
    title = "Preference for Human Interaction by Cluster",
    x = "Cluster",
    y = "Preference for Human Interaction (Q12g)"
  ) +
  theme_minimal()

# =====================================================
# ASSUMPTION CHECKS – H1e
# =====================================================

library(ggplot2)
library(car)

# Normality test
shapiro.test(data_cluster_profile_5$Q12g)

    Shapiro-Wilk normality test

data:  data_cluster_profile_5$Q12g
W = 0.78641, p-value < 2.2e-16
# Histogram
ggplot(data_cluster_profile_5, aes(x = Q12g)) +
  geom_histogram(binwidth = 1) +
  theme_minimal()


# QQ plot
qqnorm(data_cluster_profile_5$Q12g)
qqline(data_cluster_profile_5$Q12g)


# Homogeneity of variances
leveneTest(Q12g ~ cluster, data = data_cluster_profile_5)
Levene's Test for Homogeneity of Variance (center = median)
       Df F value  Pr(>F)  
group   4  2.6236 0.03484 *
      315                  
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1
# =====================================================
# KRUSKAL-WALLIS TEST
# =====================================================

kruskal.test(Q12g ~ cluster, data = data_cluster_profile_5)

    Kruskal-Wallis rank sum test

data:  Q12g by cluster
Kruskal-Wallis chi-squared = 13.865, df = 4, p-value = 0.007737
# =========================================================
# 4b EFFECT SIZE FOR KRUSKAL-WALLIS
# =========================================================

library(rstatix)

effect_size_Q12g <- data_cluster_profile_5 %>%
  kruskal_effsize(Q12g ~ cluster)

print(effect_size_Q12g)
install.packages("coin")
WARNING: Rtools is required to build R packages but is not currently installed. Please download and install the appropriate version of Rtools before proceeding:

https://cran.rstudio.com/bin/windows/Rtools/
trying URL 'https://cran.rstudio.com/bin/windows/contrib/4.5/coin_1.4-3.zip'
Content type 'application/zip' length 1473035 bytes (1.4 MB)
downloaded 1.4 MB
package ‘coin’ successfully unpacked and MD5 sums checked

The downloaded binary packages are in
    C:\Users\frach\AppData\Local\Temp\Rtmp0giUNF\downloaded_packages
library(dplyr)
library(rstatix)
library(coin)
library(purrr)

data_cluster_profile_5 <- data_cluster_profile_5 %>%
  mutate(
    cluster = as.factor(cluster),
    Q12g = as.numeric(as.character(Q12g))
  ) %>%
  filter(!is.na(cluster), !is.na(Q12g))

cluster_pairs <- combn(levels(data_cluster_profile_5$cluster), 2, simplify = FALSE)

pairwise_effects_Q12g <- map_dfr(cluster_pairs, function(x) {
  tmp <- data_cluster_profile_5 %>%
    filter(cluster %in% x) %>%
    droplevels()

  wilcox_effsize(data = tmp, Q12g ~ cluster) %>%
    mutate(comparison = paste(x, collapse = " vs "))
})

print(pairwise_effects_Q12g)
# =========================================================
# HYPOTHESIS TEST – H2d
# The higher the importance of security, the higher the
# willingness to adopt AI agents in personal banking
# Variables:
# Q12a = Importance of security
# Q17  = Willingness to use AI banking agent
# =========================================================

# H0 (Null Hypothesis):
# There is no relationship between the importance of security (Q12a)
# and willingness to adopt AI banking agents (Q17).

# H1 (Research Hypothesis):
# Higher perceived importance of security is associated with a higher
# willingness to adopt AI banking agents.

# =========================================================
# 1 LOAD LIBRARIES
# =========================================================

library(dplyr)
library(ggplot2)

# =========================================================
# 2 PREPARE DATA
# =========================================================

data_cluster_profile_5 <- data_cluster_profile_5 %>%
  mutate(
    Q12a = as.numeric(Q12a),
    Q17 = as.numeric(Q17)
  )

# =========================================================
# 3 DESCRIPTIVE STATISTICS
# =========================================================

summary_stats <- data_cluster_profile_5 %>%
  summarise(
    mean_security = mean(Q12a, na.rm = TRUE),
    sd_security = sd(Q12a, na.rm = TRUE),
    mean_AI_adoption = mean(Q17, na.rm = TRUE),
    sd_AI_adoption = sd(Q17, na.rm = TRUE)
  )

print(summary_stats)

# =========================================================
# 4 CORRELATION TEST (Spearman for ordinal data)
# =========================================================

correlation_test <- cor.test(
  data_cluster_profile_5$Q12a,
  data_cluster_profile_5$Q17,
  method = "spearman",
  use = "complete.obs"
)

print(correlation_test)

    Spearman's rank correlation rho

data:  data_cluster_profile_5$Q12a and data_cluster_profile_5$Q17
S = 4229048, p-value = 0.7115
alternative hypothesis: true rho is not equal to 0
sample estimates:
       rho 
0.02158374 
# =========================================================
# 5 VISUALIZATION
# =========================================================

ggplot(data_cluster_profile_5, aes(x = Q12a, y = Q17)) +
  geom_jitter(alpha = 0.4) +
  geom_smooth(method = "lm", se = FALSE) +
  labs(
    title = "Relationship Between Security Importance and AI Agent Adoption",
    x = "Importance of Security (Q12a)",
    y = "Willingness to Use AI Banking Agent (Q17)"
  ) +
  theme_minimal()

# =====================================================
# ASSUMPTION CHECKS – H2d
# =====================================================

# Normality tests
shapiro.test(data_cluster_profile_5$Q12a)

    Shapiro-Wilk normality test

data:  data_cluster_profile_5$Q12a
W = 0.62052, p-value < 2.2e-16
shapiro.test(data_cluster_profile_5$Q17)

    Shapiro-Wilk normality test

data:  data_cluster_profile_5$Q17
W = 0.90494, p-value = 1.04e-12
# Histograms
ggplot(data_cluster_profile_5, aes(x = Q12a)) +
  geom_histogram(binwidth = 1) +
  theme_minimal()


ggplot(data_cluster_profile_5, aes(x = Q17)) +
  geom_histogram(binwidth = 1) +
  theme_minimal()


# QQ plots
qqnorm(data_cluster_profile_5$Q12a)
qqline(data_cluster_profile_5$Q12a)


qqnorm(data_cluster_profile_5$Q17)
qqline(data_cluster_profile_5$Q17)


# =====================================================
# SPEARMAN CORRELATION
# =====================================================

cor.test(
  data_cluster_profile_5$Q12a,
  data_cluster_profile_5$Q17,
  method = "spearman"
)

    Spearman's rank correlation rho

data:  data_cluster_profile_5$Q12a and data_cluster_profile_5$Q17
S = 4229048, p-value = 0.7115
alternative hypothesis: true rho is not equal to 0
sample estimates:
       rho 
0.02158374 
# =========================================================
# HYPOTHESIS TEST – H2e
# AI-enthusiastic guidance seekers perceive less financial
# stress than cautious guidance seekers and feature-oriented adopters
# Variable: Q5b
# =========================================================

library(dplyr)
library(ggplot2)

# ensure cluster is factor
data_cluster_profile_5$cluster <- as.factor(data_cluster_profile_5$cluster)

# convert Likert variable to numeric
data_cluster_profile_5 <- data_cluster_profile_5 %>%
  mutate(Q5b = as.numeric(Q5b))

# =========================================================
# 1 DESCRIPTIVE STATISTICS
# =========================================================

cluster_summary_Q5b <- data_cluster_profile_5 %>%
  group_by(cluster) %>%
  summarise(
    n = n(),
    mean = mean(Q5b, na.rm = TRUE),
    median = median(Q5b, na.rm = TRUE),
    sd = sd(Q5b, na.rm = TRUE),
    min = min(Q5b, na.rm = TRUE),
    max = max(Q5b, na.rm = TRUE)
  )

print(cluster_summary_Q5b)

# =========================================================
# 2 KRUSKAL-WALLIS TEST
# =========================================================

kruskal_test_Q5b <- kruskal.test(Q5b ~ cluster, data = data_cluster_profile_5)

print(kruskal_test_Q5b)

    Kruskal-Wallis rank sum test

data:  Q5b by cluster
Kruskal-Wallis chi-squared = 51.518, df = 4, p-value = 1.74e-10
# =========================================================
# 3 POST-HOC TEST (PAIRWISE COMPARISON)
# =========================================================

pairwise_results_Q5b <- pairwise.wilcox.test(
  data_cluster_profile_5$Q5b,
  data_cluster_profile_5$cluster,
  p.adjust.method = "bonferroni"
)

print(pairwise_results_Q5b)

    Pairwise comparisons using Wilcoxon rank sum test with continuity correction 

data:  data_cluster_profile_5$Q5b and data_cluster_profile_5$cluster 

  1       2       3       4      
2 0.00228 -       -       -      
3 1.00000 0.00314 -       -      
4 0.09388 7.8e-07 0.00759 -      
5 0.00072 1.00000 0.00094 2.1e-06

P value adjustment method: bonferroni 
# =========================================================
# 4 VISUALIZATION
# =========================================================

ggplot(data_cluster_profile_5, aes(x = cluster, y = Q5b)) +
  geom_boxplot() +
  labs(
    title = "Perceived Financial Stress by Cluster",
    x = "Cluster",
    y = "Financial Stress (Q5b)"
  ) +
  theme_minimal()

# =====================================================
# ASSUMPTION CHECKS – H2e
# =====================================================

shapiro.test(data_cluster_profile_5$Q5b)

    Shapiro-Wilk normality test

data:  data_cluster_profile_5$Q5b
W = 0.92498, p-value = 1.51e-11
ggplot(data_cluster_profile_5, aes(x = Q5b)) +
  geom_histogram(binwidth = 1) +
  theme_minimal()


qqnorm(data_cluster_profile_5$Q5b)
qqline(data_cluster_profile_5$Q5b)


leveneTest(Q5b ~ cluster, data = data_cluster_profile_5)
Levene's Test for Homogeneity of Variance (center = median)
       Df F value Pr(>F)
group   4  1.5213 0.1957
      313               
# =====================================================
# KRUSKAL-WALLIS TEST
# =====================================================

kruskal.test(Q5b ~ cluster, data = data_cluster_profile_5)

    Kruskal-Wallis rank sum test

data:  Q5b by cluster
Kruskal-Wallis chi-squared = 51.518, df = 4, p-value = 1.74e-10
library(rstatix)

effect_size_Q5b <- data_cluster_profile_5 %>%
  kruskal_effsize(Q5b ~ cluster)

print(effect_size_Q5b)

##H2f

# =====================================================
# CLEAN DATA (REMOVE INVALID AND MISSING VALUES)
# =====================================================

library(dplyr)
library(ggplot2)

data_clean <- data_cluster_profile_5 %>%
  mutate(Q19 = as.numeric(Q19)) %>%   # ensure numeric
  filter(Q19 >= 1)                    # remove invalid values (<1) and NA

# =====================================================
# DESCRIPTIVE STATISTICS BY CLUSTER
# =====================================================

cluster_summary_Q19 <- data_clean %>%
  group_by(cluster) %>%
  summarise(
    n = n(),
    mean = mean(Q19, na.rm = TRUE),
    median = median(Q19, na.rm = TRUE),
    sd = sd(Q19, na.rm = TRUE),
    min = min(Q19, na.rm = TRUE),
    max = max(Q19, na.rm = TRUE)
  )

print(cluster_summary_Q19)

# =====================================================
# KRUSKAL-WALLIS TEST
# =====================================================

kruskal_test_Q19 <- kruskal.test(Q19 ~ cluster, data = data_clean)

print(kruskal_test_Q19)

    Kruskal-Wallis rank sum test

data:  Q19 by cluster
Kruskal-Wallis chi-squared = 3.9454, df = 4, p-value = 0.4134
# =====================================================
# PAIRWISE WILCOXON TEST
# =====================================================

pairwise_results_Q19 <- pairwise.wilcox.test(
  data_clean$Q19,
  data_clean$cluster,
  p.adjust.method = "bonferroni"
)

print(pairwise_results_Q19)

    Pairwise comparisons using Wilcoxon rank sum test with continuity correction 

data:  data_clean$Q19 and data_clean$cluster 

  1 2 3 4
2 1 - - -
3 1 1 - -
4 1 1 1 -
5 1 1 1 1

P value adjustment method: bonferroni 
# =====================================================
# VISUALIZATION
# =====================================================

ggplot(data_clean, aes(x = cluster, y = Q19)) +
  geom_boxplot() +
  labs(
    title = "Willingness to Pay for AI Banking Assistant by Cluster",
    x = "Cluster",
    y = "Monthly Willingness to Pay (€)"
  ) +
  theme_minimal()

# =====================================================
# ASSUMPTION CHECKS – H2f
# =====================================================

shapiro.test(data_clean$Q19)

    Shapiro-Wilk normality test

data:  data_clean$Q19
W = 0.93183, p-value = 0.002376
ggplot(data_clean, aes(x = Q19)) +
  geom_histogram(binwidth = 1) +
  theme_minimal()


qqnorm(data_clean$Q19)
qqline(data_clean$Q19)


leveneTest(Q19 ~ cluster, data = data_clean)
Levene's Test for Homogeneity of Variance (center = median)
      Df F value Pr(>F)
group  4  0.6078 0.6587
      55               
# =====================================================
# KRUSKAL-WALLIS TEST
# =====================================================

kruskal.test(Q19 ~ cluster, data = data_clean)

    Kruskal-Wallis rank sum test

data:  Q19 by cluster
Kruskal-Wallis chi-squared = 3.9454, df = 4, p-value = 0.4134
df <- data_cluster_profile_5
# =====================================================
# KRUSKAL-WALLIS TEST
# =====================================================

kruskal_test_Q19 <- kruskal.test(Q19 ~ cluster, data = data_clean)
print(kruskal_test_Q19)

    Kruskal-Wallis rank sum test

data:  Q19 by cluster
Kruskal-Wallis chi-squared = 3.9454, df = 4, p-value = 0.4134
# =====================================================
# EFFECT SIZE
# =====================================================

library(rstatix)

effect_size_Q19 <- data_clean %>%
  kruskal_effsize(Q19 ~ cluster)

print(effect_size_Q19)
library(dplyr)
library(rstatix)
library(coin)
library(purrr)

data_clean <- data_cluster_profile_5 %>%
  mutate(
    cluster = as.factor(cluster),
    Q19 = as.numeric(as.character(Q19))
  ) %>%
  filter(!is.na(cluster), !is.na(Q19), Q19 >= 1)

cluster_pairs <- combn(levels(data_clean$cluster), 2, simplify = FALSE)

pairwise_effects_Q19 <- map_dfr(cluster_pairs, function(x) {
  tmp <- data_clean %>%
    filter(cluster %in% x) %>%
    droplevels()

  wilcox_effsize(data = tmp, Q19 ~ cluster) %>%
    mutate(comparison = paste(x, collapse = " vs "))
})

print(pairwise_effects_Q19)
library(dplyr)
df <- df |>
  mutate(
    across(c(Q10a, Q10b, Q10c, Q10d,
             Q11a, Q11b, Q11c, Q11d, Q11e, Q11f,
             Q17), as.numeric),

    low_risk_delegate  = rowMeans(pick(Q11a, Q11b, Q11f), na.rm = TRUE),
    high_risk_delegate = rowMeans(pick(Q11c, Q11d, Q11e), na.rm = TRUE),

    confirm_required   = Q10c,
    autonomous_decisions = Q10d,

    trust_ai = rowMeans(pick(Q10a, Q10b, Q10c, Q10d), na.rm = TRUE),
    intention_use = Q17
  )

df$cluster <- factor(df$cluster)
table(df$cluster)

 1  2  3  4  5 
55 98 73 32 62 

Min and max

df |>
  summarise(
    h1a_low_min = min(low_risk_delegate, na.rm = TRUE),
    h1a_low_max = max(low_risk_delegate, na.rm = TRUE),
    h1a_high_min = min(high_risk_delegate, na.rm = TRUE),
    h1a_high_max = max(high_risk_delegate, na.rm = TRUE),

    h1b_confirm_min = min(confirm_required, na.rm = TRUE),
    h1b_confirm_max = max(confirm_required, na.rm = TRUE),
    h1b_auto_min = min(autonomous_decisions, na.rm = TRUE),
    h1b_auto_max = max(autonomous_decisions, na.rm = TRUE),

    h2a_trust_min = min(trust_ai, na.rm = TRUE),
    h2a_trust_max = max(trust_ai, na.rm = TRUE),

    h2c_intention_min = min(intention_use, na.rm = TRUE),
    h2c_intention_max = max(intention_use, na.rm = TRUE)
  )

H1a

h1a_results <- df |>
  group_by(cluster) |>
  do({
    sub <- .
    test <- t.test(sub$low_risk_delegate, sub$high_risk_delegate, paired = TRUE)

    tibble(
      n = nrow(sub),
      low_mean = mean(sub$low_risk_delegate, na.rm = TRUE),
      high_mean = mean(sub$high_risk_delegate, na.rm = TRUE),
      t_value = unname(test$statistic),
      p_value = test$p.value
    )
  })

h1a_results
df <- df |>
  mutate(
    h1a_diff = low_risk_delegate - high_risk_delegate
  )

Normality

by(df$h1a_diff, df$cluster, shapiro.test)
df$cluster: 1

    Shapiro-Wilk normality test

data:  dd[x, ]
W = 0.88369, p-value = 7.063e-05

---------------------------------------------------------------- 
df$cluster: 2

    Shapiro-Wilk normality test

data:  dd[x, ]
W = 0.95528, p-value = 0.002138

---------------------------------------------------------------- 
df$cluster: 3

    Shapiro-Wilk normality test

data:  dd[x, ]
W = 0.96967, p-value = 0.07566

---------------------------------------------------------------- 
df$cluster: 4

    Shapiro-Wilk normality test

data:  dd[x, ]
W = 0.74155, p-value = 3.872e-06

---------------------------------------------------------------- 
df$cluster: 5

    Shapiro-Wilk normality test

data:  dd[x, ]
W = 0.94489, p-value = 0.00763

Wilcoxon signed-rank

h1a_wilcox_results <- df |>
  group_by(cluster) |>
  do({
    sub <- .
    test <- wilcox.test(sub$low_risk_delegate, sub$high_risk_delegate, paired = TRUE)

    tibble(
      n = nrow(sub),
      low_mean = mean(sub$low_risk_delegate, na.rm = TRUE),
      high_mean = mean(sub$high_risk_delegate, na.rm = TRUE),
      p_value = test$p.value
    )
  })

h1a_wilcox_results
h1a_final_results <- df |>
  group_by(cluster) |>
  do({
    sub <- .
    
    t_res <- t.test(sub$low_risk_delegate, sub$high_risk_delegate, paired = TRUE)
    w_res <- wilcox.test(sub$low_risk_delegate, sub$high_risk_delegate, paired = TRUE)
    
    diff <- sub$low_risk_delegate - sub$high_risk_delegate
    diff <- diff[!is.na(diff)]
    
    dz <- if (sd(diff) == 0) NA_real_ else mean(diff) / sd(diff)
    
    diff_nz <- diff[diff != 0]
    if (length(diff_nz) == 0) {
      rbc <- NA_real_
    } else {
      ranks <- rank(abs(diff_nz))
      W_pos <- sum(ranks[diff_nz > 0])
      W_neg <- sum(ranks[diff_nz < 0])
      rbc <- (W_pos - W_neg) / (W_pos + W_neg)
    }

    tibble(
      n = length(diff),
      low_mean = mean(sub$low_risk_delegate, na.rm = TRUE),
      high_mean = mean(sub$high_risk_delegate, na.rm = TRUE),
      mean_diff = mean(diff),
      t_value = unname(t_res$statistic),
      t_p_value = t_res$p.value,
      wilcox_p_value = w_res$p.value,
      cohen_dz = dz,
      rank_biserial = rbc
    )
  })

h1a_final_results

H1b

h1b_results <- df |>
  group_by(cluster) |>
  do({
    sub <- .
    test <- t.test(sub$confirm_required, sub$autonomous_decisions, paired = TRUE)

    tibble(
      n = nrow(sub),
      confirm_mean = mean(sub$confirm_required, na.rm = TRUE),
      autonomous_mean = mean(sub$autonomous_decisions, na.rm = TRUE),
      t_value = unname(test$statistic),
      p_value = test$p.value
    )
  })

h1b_results
df <- df |>
  mutate(
    h1b_diff = confirm_required - autonomous_decisions
  )

Normality by cluster

by(df$h1b_diff, df$cluster, shapiro.test)
df$cluster: 1

    Shapiro-Wilk normality test

data:  dd[x, ]
W = 0.86987, p-value = 2.597e-05

---------------------------------------------------------------- 
df$cluster: 2

    Shapiro-Wilk normality test

data:  dd[x, ]
W = 0.94847, p-value = 0.0008754

---------------------------------------------------------------- 
df$cluster: 3

    Shapiro-Wilk normality test

data:  dd[x, ]
W = 0.89899, p-value = 2.478e-05

---------------------------------------------------------------- 
df$cluster: 4

    Shapiro-Wilk normality test

data:  dd[x, ]
W = 0.74448, p-value = 4.324e-06

---------------------------------------------------------------- 
df$cluster: 5

    Shapiro-Wilk normality test

data:  dd[x, ]
W = 0.87691, p-value = 1.58e-05

Wilcoxon signed-rank

h1b_wilcox_results <- df |>
  group_by(cluster) |>
  do({
    sub <- .
    test <- wilcox.test(
      sub$confirm_required,
      sub$autonomous_decisions,
      paired = TRUE,
      exact = FALSE
    )

    tibble(
      n = nrow(sub),
      confirm_mean = mean(sub$confirm_required, na.rm = TRUE),
      autonomous_mean = mean(sub$autonomous_decisions, na.rm = TRUE),
      p_value = test$p.value
    )
  })

h1b_wilcox_results
h1b_final_results <- df |>
  group_by(cluster) |>
  do({
    sub <- .
    
    t_res <- t.test(sub$confirm_required, sub$autonomous_decisions, paired = TRUE)
    w_res <- wilcox.test(
      sub$confirm_required,
      sub$autonomous_decisions,
      paired = TRUE,
      exact = FALSE
    )
    
    diff <- sub$confirm_required - sub$autonomous_decisions
    diff <- diff[!is.na(diff)]
    
    dz <- if (sd(diff) == 0) NA_real_ else mean(diff) / sd(diff)
    
    diff_nz <- diff[diff != 0]
    if (length(diff_nz) == 0) {
      rbc <- NA_real_
    } else {
      ranks <- rank(abs(diff_nz))
      W_pos <- sum(ranks[diff_nz > 0])
      W_neg <- sum(ranks[diff_nz < 0])
      rbc <- (W_pos - W_neg) / (W_pos + W_neg)
    }

    tibble(
      n = length(diff),
      confirm_mean = mean(sub$confirm_required, na.rm = TRUE),
      autonomous_mean = mean(sub$autonomous_decisions, na.rm = TRUE),
      mean_diff = mean(diff),
      t_value = unname(t_res$statistic),
      t_p_value = t_res$p.value,
      wilcox_p_value = w_res$p.value,
      cohen_dz = dz,
      rank_biserial = rbc
    )
  })

h1b_final_results
library(dplyr)

# make sure variables are in the right format
df$cluster <- as.factor(df$cluster)
df$trust_ai <- as.numeric(df$trust_ai)

## H2a
h2a_model <- aov(trust_ai ~ cluster, data = df)
summary(h2a_model)
             Df Sum Sq Mean Sq F value Pr(>F)    
cluster       4  385.0   96.26   76.05 <2e-16 ***
Residuals   315  398.7    1.27                   
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1
# Post-hoc option 1: Tukey
TukeyHSD(h2a_model)
  Tukey multiple comparisons of means
    95% family-wise confidence level

Fit: aov(formula = trust_ai ~ cluster, data = df)

$cluster
          diff          lwr        upr     p adj
2-1  1.1170686  0.597018142  1.6371191 0.0000001
3-1  1.5861768  1.035043859  2.1373098 0.0000000
4-1 -1.2555398 -1.941813671 -0.5692659 0.0000086
5-1  2.5143695  1.942614555  3.0861244 0.0000000
3-2  0.4691082 -0.008110863  0.9463272 0.0566237
4-2 -2.3726084 -3.001068703 -1.7441481 0.0000000
5-2  1.3973009  0.896407469  1.8981942 0.0000000
4-3 -2.8417166 -3.496130365 -2.1873029 0.0000000
5-3  0.9281927  0.395098660  1.4612867 0.0000268
5-4  3.7699093  3.098036131  4.4417824 0.0000000
# Post-hoc option 2: pairwise t-tests with Bonferroni
pairwise.t.test(
  x = df$trust_ai,
  g = df$cluster,
  p.adjust.method = "bonferroni"
)

    Pairwise comparisons using t tests with pooled SD 

data:  df$trust_ai and df$cluster 

  1       2       3       4      
2 9.7e-08 -       -       -      
3 4.8e-13 0.074   -       -      
4 8.7e-06 < 2e-16 < 2e-16 -      
5 < 2e-16 2.4e-12 2.7e-05 < 2e-16

P value adjustment method: bonferroni 
# Descriptive means
aggregate(trust_ai ~ cluster, data = df, mean, na.rm = TRUE)
install.packages("effectsize")
WARNING: Rtools is required to build R packages but is not currently installed. Please download and install the appropriate version of Rtools before proceeding:

https://cran.rstudio.com/bin/windows/Rtools/

  There is a binary version available but the source version is later:
trying URL 'https://cran.rstudio.com/src/contrib/effectsize_1.0.2.tar.gz'
Content type 'application/x-gzip' length 396056 bytes (386 KB)
downloaded 386 KB
* installing *source* package 'effectsize' ...
** this is package 'effectsize' version '1.0.2'
** package 'effectsize' successfully unpacked and MD5 sums checked
** using staged installation
** R
** data
** inst
** byte-compile and prepare package for lazy loading
** help
*** installing help indices
*** copying figures
** building package indices
** installing vignettes
** testing if installed package can be loaded from temporary location
** testing if installed package can be loaded from final location
** testing if installed package keeps a record of temporary installation path
* DONE (effectsize)

The downloaded source packages are in
    ‘C:\Users\frach\AppData\Local\Temp\Rtmp0giUNF\downloaded_packages’
library(effectsize)
library(dplyr)
library(effectsize)

df$cluster <- as.factor(df$cluster)
df$trust_ai <- as.numeric(df$trust_ai)

## H2a
h2a_model <- aov(trust_ai ~ cluster, data = df)
summary(h2a_model)
             Df Sum Sq Mean Sq F value Pr(>F)    
cluster       4  385.0   96.26   76.05 <2e-16 ***
Residuals   315  398.7    1.27                   
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1
TukeyHSD(h2a_model)
  Tukey multiple comparisons of means
    95% family-wise confidence level

Fit: aov(formula = trust_ai ~ cluster, data = df)

$cluster
          diff          lwr        upr     p adj
2-1  1.1170686  0.597018142  1.6371191 0.0000001
3-1  1.5861768  1.035043859  2.1373098 0.0000000
4-1 -1.2555398 -1.941813671 -0.5692659 0.0000086
5-1  2.5143695  1.942614555  3.0861244 0.0000000
3-2  0.4691082 -0.008110863  0.9463272 0.0566237
4-2 -2.3726084 -3.001068703 -1.7441481 0.0000000
5-2  1.3973009  0.896407469  1.8981942 0.0000000
4-3 -2.8417166 -3.496130365 -2.1873029 0.0000000
5-3  0.9281927  0.395098660  1.4612867 0.0000268
5-4  3.7699093  3.098036131  4.4417824 0.0000000
aggregate(trust_ai ~ cluster, data = df, mean, na.rm = TRUE)

# Effect sizes
eta_squared(h2a_model)
# Effect Size for ANOVA

Parameter | Eta2 |       95% CI
-------------------------------
cluster   | 0.49 | [0.43, 1.00]

- One-sided CIs: upper bound fixed at [1.00].
omega_squared(h2a_model)
# Effect Size for ANOVA

Parameter | Omega2 |       95% CI
---------------------------------
cluster   |   0.48 | [0.42, 1.00]

- One-sided CIs: upper bound fixed at [1.00].
h2a_eta <- eta_squared(h2a_model)
print(h2a_eta)
# Effect Size for ANOVA

Parameter | Eta2 |       95% CI
-------------------------------
cluster   | 0.49 | [0.43, 1.00]

- One-sided CIs: upper bound fixed at [1.00].
h2a_omega <- omega_squared(h2a_model)
print(h2a_omega)
# Effect Size for ANOVA

Parameter | Omega2 |       95% CI
---------------------------------
cluster   |   0.48 | [0.42, 1.00]

- One-sided CIs: upper bound fixed at [1.00].

H2c

h2c_results <- lapply(levels(df$cluster), function(cl) {
  sub <- df |>
    filter(cluster == cl)

  model <- lm(intention_use ~ trust_ai, data = sub)
  coefs <- summary(model)$coefficients

  tibble(
  cluster = cl,
  b_trust = coefs["trust_ai", "Estimate"],
  p_value = coefs["trust_ai", "Pr(>|t|)"],
  r_squared = summary(model)$r.squared
)
}) |>
  bind_rows()

h2c_results

Normality of regression residuals by cluster

for(cl in levels(df$cluster)) {
  sub <- df |>
    filter(cluster == cl)

  model <- lm(intention_use ~ trust_ai, data = sub)

  cat("\n====================================\n")
  cat("CLUSTER:", cl, "\n")
  cat("====================================\n")
  print(shapiro.test(residuals(model)))
}

====================================
CLUSTER: 1 
====================================

    Shapiro-Wilk normality test

data:  residuals(model)
W = 0.96142, p-value = 0.1019


====================================
CLUSTER: 2 
====================================

    Shapiro-Wilk normality test

data:  residuals(model)
W = 0.95435, p-value = 0.003354


====================================
CLUSTER: 3 
====================================

    Shapiro-Wilk normality test

data:  residuals(model)
W = 0.95225, p-value = 0.01102


====================================
CLUSTER: 4 
====================================

    Shapiro-Wilk normality test

data:  residuals(model)
W = 0.87471, p-value = 0.002561


====================================
CLUSTER: 5 
====================================

    Shapiro-Wilk normality test

data:  residuals(model)
W = 0.86598, p-value = 9.328e-06

Spearman test

h2c_spearman <- lapply(levels(df$cluster), function(cl) {
  sub <- df |>
    filter(cluster == cl)

  test <- cor.test(sub$trust_ai, sub$intention_use, method = "spearman")

  tibble(
    cluster = cl,
    rho = unname(test$estimate),
    p_value = test$p.value
  )
}) |>
  bind_rows()

h2c_spearman
h2c_results <- lapply(levels(df$cluster), function(cl) {
  sub <- df |>
    filter(cluster == cl)

  model <- lm(intention_use ~ trust_ai, data = sub)
  coefs <- summary(model)$coefficients

  tibble(
    cluster = cl,
    b_trust = coefs["trust_ai", "Estimate"],
    p_value = coefs["trust_ai", "Pr(>|t|)"],
    r_squared = summary(model)$r.squared,
    adj_r_squared = summary(model)$adj.r.squared
  )
}) |>
  bind_rows()

h2c_results
library(dplyr)
library(tidyr)
library(purrr)
library(tibble)

data_cluster_profile_5 <- data_cluster_profile_5 |>
  mutate(
    cluster_named = factor(
      cluster,
      levels = c(1, 2, 3, 4, 5),
      labels = c(
        "Skeptical support seekers",
        "Cautious guidance seekers",
        "Feature-oriented adopters",
        "AI-resistant independents",
        "AI-enthusiastic guidance seekers"
      )
    )
  )
bank_labels <- c(
  a = "OTP",
  b = "Gorenjska Banka",
  c = "NLB",
  d = "Revolut",
  e = "N26",
  f = "Intesa SanPaolo",
  g = "UniCredit"
)

run_bank_pairwise_tests <- function(data, cluster_name) {
  
  subset_data <- data |>
    filter(cluster_named == cluster_name) |>
    mutate(across(Q13a:Q15g, as.numeric))
  
  compare_dimension <- function(df, vars, dimension_name) {
    
    pairs <- combn(vars, 2, simplify = FALSE)
    
    results <- lapply(pairs, function(pair) {
      v1 <- pair[1]
      v2 <- pair[2]
      
      x <- df[[v1]]
      y <- df[[v2]]
      
      complete_idx <- complete.cases(x, y)
      x <- x[complete_idx]
      y <- y[complete_idx]
      
      test <- wilcox.test(x, y, paired = TRUE, exact = FALSE)
      
      tibble(
        cluster = cluster_name,
        dimension = dimension_name,
        bank_1 = bank_labels[substr(v1, nchar(v1), nchar(v1))],
        bank_2 = bank_labels[substr(v2, nchar(v2), nchar(v2))],
        n = length(x),
        mean_bank_1 = mean(x, na.rm = TRUE),
        mean_bank_2 = mean(y, na.rm = TRUE),
        p_value = test$p.value
      )
    })
    
    bind_rows(results) |>
      mutate(
        p_adjusted = p.adjust(p_value, method = "bonferroni"),
        significant = ifelse(p_adjusted < 0.05, "Yes", "No")
      ) |>
      arrange(p_adjusted)
  }
  
  innovation_results <- compare_dimension(
    subset_data,
    vars = c("Q13a", "Q13b", "Q13c", "Q13d", "Q13e", "Q13f", "Q13g"),
    dimension_name = "Innovation"
  )
  
  support_results <- compare_dimension(
    subset_data,
    vars = c("Q14a", "Q14b", "Q14c", "Q14d", "Q14e", "Q14f", "Q14g"),
    dimension_name = "Customer support"
  )
  
  reliability_results <- compare_dimension(
    subset_data,
    vars = c("Q15a", "Q15b", "Q15c", "Q15d", "Q15e", "Q15f", "Q15g"),
    dimension_name = "Reliability"
  )
  
  bind_rows(
    innovation_results,
    support_results,
    reliability_results
  )
}
all_cluster_bank_tests <- bind_rows(
  run_bank_pairwise_tests(data_cluster_profile_5, "Skeptical support seekers"),
  run_bank_pairwise_tests(data_cluster_profile_5, "Cautious guidance seekers"),
  run_bank_pairwise_tests(data_cluster_profile_5, "Feature-oriented adopters"),
  run_bank_pairwise_tests(data_cluster_profile_5, "AI-resistant independents"),
  run_bank_pairwise_tests(data_cluster_profile_5, "AI-enthusiastic guidance seekers")
)

all_cluster_bank_tests
all_cluster_bank_tests_sig <- all_cluster_bank_tests |>
  filter(p_adjusted < 0.05)

all_cluster_bank_tests_sig
all_cluster_bank_tests_sig <- all_cluster_bank_tests_sig |>
  arrange(cluster, dimension, p_adjusted)

all_cluster_bank_tests_sig
all_cluster_bank_tests_sig |>
  count(cluster, dimension)
write.csv(
  all_cluster_bank_tests,
  "all_cluster_bank_pairwise_tests.csv",
  row.names = FALSE
)

write.csv(
  all_cluster_bank_tests_sig,
  "significant_cluster_bank_pairwise_tests.csv",
  row.names = FALSE
)
# Recreate readable output tables from all_cluster_bank_tests

interpretable_results <- all_cluster_bank_tests |>
  mutate(
    mean_bank_1 = round(mean_bank_1, 2),
    mean_bank_2 = round(mean_bank_2, 2),
    mean_difference = round(mean_bank_1 - mean_bank_2, 2),
    higher_rated_bank = case_when(
      mean_bank_1 > mean_bank_2 ~ bank_1,
      mean_bank_2 > mean_bank_1 ~ bank_2,
      TRUE ~ "Equal"
    ),
    interpretation = case_when(
      p_adjusted < 0.05 & mean_bank_1 > mean_bank_2 ~
        paste0(bank_1, " is rated significantly higher than ", bank_2),
      p_adjusted < 0.05 & mean_bank_2 > mean_bank_1 ~
        paste0(bank_2, " is rated significantly higher than ", bank_1),
      TRUE ~ "No significant difference"
    ),
    p_value = round(p_value, 4),
    p_adjusted = round(p_adjusted, 4)
  ) |>
  arrange(cluster, dimension, p_adjusted)

significant_results_clean <- interpretable_results |>
  filter(p_adjusted < 0.05) |>
  select(
    cluster,
    dimension,
    bank_1,
    bank_2,
    mean_bank_1,
    mean_bank_2,
    mean_difference,
    higher_rated_bank,
    p_value,
    p_adjusted,
    interpretation
  )

report_table <- significant_results_clean |>
  transmute(
    Cluster = cluster,
    Dimension = dimension,
    Comparison = paste(bank_1, "vs", bank_2),
    `Mean bank 1` = mean_bank_1,
    `Mean bank 2` = mean_bank_2,
    `Mean difference` = mean_difference,
    `Higher-rated bank` = higher_rated_bank,
    `Raw p-value` = p_value,
    `Adjusted p-value` = p_adjusted,
    Interpretation = interpretation
  )

# Show outputs
interpretable_results
significant_results_clean
report_table
all_cluster_bank_tests |>
  mutate(
    mean_bank_1 = round(mean_bank_1, 2),
    mean_bank_2 = round(mean_bank_2, 2),
    p_adjusted = round(p_adjusted, 4),
    result = case_when(
      p_adjusted < 0.05 & mean_bank_1 > mean_bank_2 ~ paste(bank_1, ">", bank_2),
      p_adjusted < 0.05 & mean_bank_2 > mean_bank_1 ~ paste(bank_2, ">", bank_1),
      TRUE ~ "No significant difference"
    )
  ) |>
  filter(p_adjusted < 0.05) |>
  select(cluster, dimension, bank_1, bank_2, mean_bank_1, mean_bank_2, p_adjusted, result) |>
  arrange(cluster, dimension, p_adjusted)
library(dplyr)

q19_cluster_summary <- data_cluster_profile_5 |>
  mutate(
    cluster = factor(
      cluster,
      levels = c(1, 2, 3, 4, 5),
      labels = c(
        "Skeptical support seekers",
        "Cautious guidance seekers",
        "Feature-oriented adopters",
        "AI-resistant independents",
        "AI-enthusiastic guidance seekers"
      )
    ),
    Q19 = as.numeric(Q19)
  ) |>
  filter(!is.na(Q19), Q19 >= 1) |>
  group_by(cluster) |>
  summarise(
    n = n(),
    mean_q19 = mean(Q19, na.rm = TRUE),
    median_q19 = median(Q19, na.rm = TRUE),
    sd_q19 = sd(Q19, na.rm = TRUE),
    min_q19 = min(Q19, na.rm = TRUE),
    max_q19 = max(Q19, na.rm = TRUE),
    .groups = "drop"
  ) |>
  mutate(
    mean_q19 = round(mean_q19, 2),
    median_q19 = round(median_q19, 2),
    sd_q19 = round(sd_q19, 2)
  ) |>
  arrange(desc(mean_q19))

q19_cluster_summary
kruskal.test(Q19 ~ cluster, data = data_cluster_profile_5 |>
  mutate(
    cluster = factor(
      cluster,
      levels = c(1, 2, 3, 4, 5),
      labels = c(
        "Skeptical support seekers",
        "Cautious guidance seekers",
        "Feature-oriented adopters",
        "AI-resistant independents",
        "AI-enthusiastic guidance seekers"
      )
    ),
    Q19 = as.numeric(Q19)
  ) |>
  filter(!is.na(Q19), Q19 >= 1)
)

    Kruskal-Wallis rank sum test

data:  Q19 by cluster
Kruskal-Wallis chi-squared = 3.9454, df = 4, p-value = 0.4134
library(dplyr)

nlb_revolut_n26_overlap <- data_cluster_profile_5 |>
  mutate(
    cluster = factor(
      cluster,
      levels = c(1, 2, 3, 4, 5),
      labels = c(
        "Skeptical support seekers",
        "Cautious guidance seekers",
        "Feature-oriented adopters",
        "AI-resistant independents",
        "AI-enthusiastic guidance seekers"
      )
    ),
    Q25c = as.numeric(Q25c),  # NLB
    Q25d = as.numeric(Q25d),  # Revolut
    Q25e = as.numeric(Q25e)   # N26
  ) |>
  group_by(cluster) |>
  summarise(
    cluster_n = n(),
    n_nlb_revolut_n26 = sum(Q25c == 1 & Q25d == 1 & Q25e == 1, na.rm = TRUE),
    percent_nlb_revolut_n26 = round(100 * n_nlb_revolut_n26 / cluster_n, 1),
    .groups = "drop"
  )

nlb_revolut_n26_overlap
library(dplyr)

nlb_revolut_n26_combinations <- data_cluster_profile_5 |>
  mutate(
    cluster = factor(
      cluster,
      levels = c(1, 2, 3, 4, 5),
      labels = c(
        "Skeptical support seekers",
        "Cautious guidance seekers",
        "Feature-oriented adopters",
        "AI-resistant independents",
        "AI-enthusiastic guidance seekers"
      )
    ),
    Q25c = as.numeric(Q25c),  # NLB
    Q25d = as.numeric(Q25d),  # Revolut
    Q25e = as.numeric(Q25e)   # N26
  ) |>
  mutate(
    bank_combo = case_when(
      Q25c == 1 & Q25d == 1 & Q25e == 1 ~ "NLB + Revolut + N26",
      Q25c == 1 & Q25d == 1 & (is.na(Q25e) | Q25e != 1) ~ "NLB + Revolut",
      Q25c == 1 & Q25e == 1 & (is.na(Q25d) | Q25d != 1) ~ "NLB + N26",
      Q25d == 1 & Q25e == 1 & (is.na(Q25c) | Q25c != 1) ~ "Revolut + N26",
      Q25c == 1 & (is.na(Q25d) | Q25d != 1) & (is.na(Q25e) | Q25e != 1) ~ "NLB only",
      Q25d == 1 & (is.na(Q25c) | Q25c != 1) & (is.na(Q25e) | Q25e != 1) ~ "Revolut only",
      Q25e == 1 & (is.na(Q25c) | Q25c != 1) & (is.na(Q25d) | Q25d != 1) ~ "N26 only",
      TRUE ~ "None of these three"
    )
  ) |>
  group_by(cluster, bank_combo) |>
  summarise(n = n(), .groups = "drop_last") |>
  mutate(percent = round(100 * n / sum(n), 1)) |>
  ungroup()

nlb_revolut_n26_combinations
library(dplyr)
library(tibble)
library(FactoMineR)
library(factoextra)
library(ggplot2)

cluster2_bank_means <- data_cluster_profile_5 |>
  filter(cluster == 2) |>
  mutate(
    across(Q13a:Q15g, as.numeric)
  ) |>
  summarise(
    OTP_innovation = mean(Q13a, na.rm = TRUE),
    Gorenjska_innovation = mean(Q13b, na.rm = TRUE),
    NLB_innovation = mean(Q13c, na.rm = TRUE),
    Revolut_innovation = mean(Q13d, na.rm = TRUE),
    N26_innovation = mean(Q13e, na.rm = TRUE),
    Intesa_innovation = mean(Q13f, na.rm = TRUE),
    UniCredit_innovation = mean(Q13g, na.rm = TRUE),

    OTP_support = mean(Q14a, na.rm = TRUE),
    Gorenjska_support = mean(Q14b, na.rm = TRUE),
    NLB_support = mean(Q14c, na.rm = TRUE),
    Revolut_support = mean(Q14d, na.rm = TRUE),
    N26_support = mean(Q14e, na.rm = TRUE),
    Intesa_support = mean(Q14f, na.rm = TRUE),
    UniCredit_support = mean(Q14g, na.rm = TRUE),

    OTP_reliability = mean(Q15a, na.rm = TRUE),
    Gorenjska_reliability = mean(Q15b, na.rm = TRUE),
    NLB_reliability = mean(Q15c, na.rm = TRUE),
    Revolut_reliability = mean(Q15d, na.rm = TRUE),
    N26_reliability = mean(Q15e, na.rm = TRUE),
    Intesa_reliability = mean(Q15f, na.rm = TRUE),
    UniCredit_reliability = mean(Q15g, na.rm = TRUE)
  )

cluster2_bank_means
cluster2_bank_table <- tibble(
  bank = c("OTP", "Gorenjska Banka", "NLB", "Revolut", "N26", "Intesa SanPaolo", "UniCredit"),
  innovation = c(
    mean(data_cluster_profile_5 |> filter(cluster == 2) |> pull(Q13a), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 2) |> pull(Q13b), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 2) |> pull(Q13c), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 2) |> pull(Q13d), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 2) |> pull(Q13e), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 2) |> pull(Q13f), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 2) |> pull(Q13g), na.rm = TRUE)
  ),
  customer_support = c(
    mean(data_cluster_profile_5 |> filter(cluster == 2) |> pull(Q14a), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 2) |> pull(Q14b), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 2) |> pull(Q14c), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 2) |> pull(Q14d), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 2) |> pull(Q14e), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 2) |> pull(Q14f), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 2) |> pull(Q14g), na.rm = TRUE)
  ),
  reliability = c(
    mean(data_cluster_profile_5 |> filter(cluster == 2) |> pull(Q15a), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 2) |> pull(Q15b), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 2) |> pull(Q15c), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 2) |> pull(Q15d), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 2) |> pull(Q15e), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 2) |> pull(Q15f), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 2) |> pull(Q15g), na.rm = TRUE)
  )
)

cluster2_bank_table
cluster2_mat <- cluster2_bank_table |>
  column_to_rownames("bank") |>
  as.matrix()

pca_cluster2 <- FactoMineR::PCA(cluster2_mat, scale.unit = TRUE, graph = FALSE)
cluster2_coordinates <- as.data.frame(pca_cluster2$ind$coord)
cluster2_coordinates$bank <- rownames(cluster2_coordinates)
rownames(cluster2_coordinates) <- NULL

cluster2_coordinates
cluster2_loadings <- as.data.frame(pca_cluster2$var$coord)
cluster2_loadings$dimension <- rownames(cluster2_loadings)
rownames(cluster2_loadings) <- NULL

cluster2_loadings
cluster2_nlb_explanation <- cluster2_bank_table |>
  filter(bank == "NLB") |>
  mutate(
    Dim1_loading_innovation = pca_cluster2$var$coord["innovation", "Dim.1"],
    Dim1_loading_support = pca_cluster2$var$coord["customer_support", "Dim.1"],
    Dim1_loading_reliability = pca_cluster2$var$coord["reliability", "Dim.1"],
    Dim2_loading_innovation = pca_cluster2$var$coord["innovation", "Dim.2"],
    Dim2_loading_support = pca_cluster2$var$coord["customer_support", "Dim.2"],
    Dim2_loading_reliability = pca_cluster2$var$coord["reliability", "Dim.2"],
    NLB_Dim1 = pca_cluster2$ind$coord["NLB", "Dim.1"],
    NLB_Dim2 = pca_cluster2$ind$coord["NLB", "Dim.2"]
  )

cluster2_nlb_explanation
factoextra::fviz_pca_biplot(
  pca_cluster2,
  repel = TRUE,
  col.var = "gray30",
  col.ind = "steelblue",
  pointsize = 3
) +
  ggplot2::ggtitle("Perception Map of Banks - Cluster 2") +
  ggplot2::xlab("Dim 1") +
  ggplot2::ylab("Dim 2") +
  ggplot2::theme_minimal()

cluster2_bank_table
cluster2_coordinates
cluster2_loadings
library(dplyr)
library(tibble)
library(FactoMineR)
library(factoextra)
library(ggplot2)

# --------------------------------------------
# 1) Bank mean table for cluster 3
# --------------------------------------------
cluster3_bank_table <- tibble(
  bank = c("OTP", "Gorenjska Banka", "NLB", "Revolut", "N26", "Intesa SanPaolo", "UniCredit"),
  innovation = c(
    mean(data_cluster_profile_5 |> filter(cluster == 3) |> pull(Q13a), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 3) |> pull(Q13b), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 3) |> pull(Q13c), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 3) |> pull(Q13d), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 3) |> pull(Q13e), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 3) |> pull(Q13f), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 3) |> pull(Q13g), na.rm = TRUE)
  ),
  customer_support = c(
    mean(data_cluster_profile_5 |> filter(cluster == 3) |> pull(Q14a), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 3) |> pull(Q14b), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 3) |> pull(Q14c), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 3) |> pull(Q14d), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 3) |> pull(Q14e), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 3) |> pull(Q14f), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 3) |> pull(Q14g), na.rm = TRUE)
  ),
  reliability = c(
    mean(data_cluster_profile_5 |> filter(cluster == 3) |> pull(Q15a), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 3) |> pull(Q15b), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 3) |> pull(Q15c), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 3) |> pull(Q15d), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 3) |> pull(Q15e), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 3) |> pull(Q15f), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 3) |> pull(Q15g), na.rm = TRUE)
  )
)

cluster3_bank_table
# --------------------------------------------
# 2) PCA for cluster 3
# --------------------------------------------
cluster3_mat <- cluster3_bank_table |>
  column_to_rownames("bank") |>
  as.matrix()

pca_cluster3 <- FactoMineR::PCA(cluster3_mat, scale.unit = TRUE, graph = FALSE)
# --------------------------------------------
# 3) Bank coordinates
# --------------------------------------------
cluster3_coordinates <- as.data.frame(pca_cluster3$ind$coord)
cluster3_coordinates$bank <- rownames(cluster3_coordinates)
rownames(cluster3_coordinates) <- NULL

cluster3_coordinates
# --------------------------------------------
# 4) Variable loadings
# --------------------------------------------
cluster3_loadings <- as.data.frame(pca_cluster3$var$coord)
cluster3_loadings$dimension <- rownames(cluster3_loadings)
rownames(cluster3_loadings) <- NULL

cluster3_loadings
# --------------------------------------------
# 5) NLB explanation table
# --------------------------------------------
cluster3_nlb_explanation <- cluster3_bank_table |>
  filter(bank == "NLB") |>
  mutate(
    Dim1_loading_innovation = pca_cluster3$var$coord["innovation", "Dim.1"],
    Dim1_loading_support = pca_cluster3$var$coord["customer_support", "Dim.1"],
    Dim1_loading_reliability = pca_cluster3$var$coord["reliability", "Dim.1"],
    Dim2_loading_innovation = pca_cluster3$var$coord["innovation", "Dim.2"],
    Dim2_loading_support = pca_cluster3$var$coord["customer_support", "Dim.2"],
    Dim2_loading_reliability = pca_cluster3$var$coord["reliability", "Dim.2"],
    NLB_Dim1 = pca_cluster3$ind$coord["NLB", "Dim.1"],
    NLB_Dim2 = pca_cluster3$ind$coord["NLB", "Dim.2"]
  )

cluster3_nlb_explanation
# --------------------------------------------
# 6) Plot
# --------------------------------------------
factoextra::fviz_pca_biplot(
  pca_cluster3,
  repel = TRUE,
  col.var = "gray30",
  col.ind = "steelblue",
  pointsize = 3
) +
  ggplot2::ggtitle("Perception Map of Banks - Cluster 3") +
  ggplot2::xlab("Dim 1") +
  ggplot2::ylab("Dim 2") +
  ggplot2::theme_minimal()

# --------------------------------------------
# 7) Compare NLB with Revolut and N26
# --------------------------------------------
cluster3_bank_table |>
  filter(bank %in% c("NLB", "Revolut", "N26"))
cluster3_bank_table
library(dplyr)
library(tidyr)
library(purrr)

# -----------------------------
# 1) Q12 item labels
# -----------------------------
q12_labels <- c(
  Q12a = "Security",
  Q12b = "Personal data protection",
  Q12c = "Trust in the bank",
  Q12d = "Ease of use",
  Q12e = "Transaction execution speed",
  Q12f = "Variety of functions",
  Q12g = "Availability of human support",
  Q12h = "Personalized financial insights",
  Q12i = "Understanding how the program makes decisions"
)

q12_vars <- names(q12_labels)

# -----------------------------
# 2) Attach the 5-cluster solution
# -----------------------------
cluster_labels <- c(
  "Skeptical support seekers",
  "Cautious guidance seekers",
  "Feature-oriented adopters",
  "AI-resistant independents",
  "AI-enthusiastic guidance seekers"
)

data_cluster_profile_5 <- data_clean_complete %>%
  mutate(
    cluster = factor(
      k5_pca2$cluster,
      levels = 1:5,
      labels = cluster_labels
    )
  )

# -----------------------------
# 3) Function to profile ONE cluster independently
# -----------------------------
profile_one_cluster_q12 <- function(data, cluster_name) {
  
  data %>%
    filter(cluster == cluster_name) %>%
    select(all_of(q12_vars)) %>%
    mutate(across(everything(), as.numeric)) %>%
    pivot_longer(
      cols = everything(),
      names_to = "item",
      values_to = "score"
    ) %>%
    group_by(item) %>%
    summarise(
      n = sum(!is.na(score)),
      mean = round(mean(score, na.rm = TRUE), 2),
      sd = round(sd(score, na.rm = TRUE), 2),
      median = round(median(score, na.rm = TRUE), 2),
      pct_6_7 = round(mean(score %in% c(6, 7), na.rm = TRUE) * 100, 1),
      pct_7 = round(mean(score == 7, na.rm = TRUE) * 100, 1),
      .groups = "drop"
    ) %>%
    mutate(
      label = q12_labels[item],
      cluster = cluster_name
    ) %>%
    select(cluster, item, label, n, mean, sd, median, pct_6_7, pct_7) %>%
    arrange(desc(mean))
}

# -----------------------------
# 4) Create a separate profile for each cluster
# -----------------------------
cluster_1_q12_profile <- profile_one_cluster_q12(
  data_cluster_profile_5,
  "Skeptical support seekers"
)

cluster_2_q12_profile <- profile_one_cluster_q12(
  data_cluster_profile_5,
  "Cautious guidance seekers"
)

cluster_3_q12_profile <- profile_one_cluster_q12(
  data_cluster_profile_5,
  "Feature-oriented adopters"
)

cluster_4_q12_profile <- profile_one_cluster_q12(
  data_cluster_profile_5,
  "AI-resistant independents"
)

cluster_5_q12_profile <- profile_one_cluster_q12(
  data_cluster_profile_5,
  "AI-enthusiastic guidance seekers"
)

# -----------------------------
# 5) View each cluster independently
# -----------------------------
cluster_1_q12_profile
cluster_2_q12_profile
cluster_3_q12_profile
cluster_4_q12_profile
cluster_5_q12_profile
cluster_q12_profiles <- setNames(
  lapply(levels(data_cluster_profile_5$cluster), function(cl) {
    profile_one_cluster_q12(data_cluster_profile_5, cl)
  }),
  levels(data_cluster_profile_5$cluster)
)

# Example:
cluster_q12_profiles[["Skeptical support seekers"]]
cluster_q12_profiles[["AI-resistant independents"]]
bank_data <- data_cluster_profile_5 |>
  mutate(across(Q25a:Q25l, as.numeric))
bank_combinations <- bank_data |>
  mutate(

    # Revolut only
    revolut_only =
      Q25d == 1 &
      rowSums(across(Q25a:Q25c)) == 0 &
      rowSums(across(Q25e:Q25l)) == 0,

    # NLB + Revolut
    nlb_revolut =
      Q25c == 1 & Q25d == 1,

    # Revolut + any other bank except NLB
    revolut_other =
      Q25d == 1 &
      rowSums(across(c(Q25a, Q25b, Q25e:Q25l))) > 0,

    # Revolut + grouped "other banks" (all except NLB)
    revolut_group_other =
      Q25d == 1 &
      rowSums(across(c(Q25a, Q25b, Q25e:Q25l))) > 0
  )
revolut_cluster_table <- bank_combinations |>
  group_by(cluster) |>
  summarise(

    n_cluster = n(),

    revolut_only = sum(revolut_only, na.rm = TRUE),
    nlb_revolut = sum(nlb_revolut, na.rm = TRUE),
    revolut_other = sum(revolut_other, na.rm = TRUE),
    revolut_group_other = sum(revolut_group_other, na.rm = TRUE),

    revolut_only_pct = round(100 * revolut_only / n_cluster, 1),
    nlb_revolut_pct = round(100 * nlb_revolut / n_cluster, 1),
    revolut_other_pct = round(100 * revolut_other / n_cluster, 1),
    revolut_group_other_pct = round(100 * revolut_group_other / n_cluster, 1)

  )

revolut_cluster_table
NA
library(tidyr)

revolut_cluster_table |>
  select(
    cluster,
    revolut_only_pct,
    nlb_revolut_pct,
    revolut_other_pct
  ) |>
  pivot_longer(
    cols = -cluster,
    names_to = "combination",
    values_to = "percent"
  )
NA
bank_data <- data_cluster_profile_5 |>
  mutate(across(Q25a:Q25l, as.numeric))
bank_groups <- bank_data |>
  mutate(

    # Revolut only
    revolut_only =
      Q25d == 1 &
      rowSums(across(c(Q25a, Q25b, Q25c, Q25e:Q25l))) == 0,

    # NLB + Revolut
    nlb_revolut =
      Q25c == 1 & Q25d == 1,

    # OTP + Revolut
    otp_revolut =
      Q25a == 1 & Q25d == 1,

    # Revolut + any other bank except NLB and OTP
    revolut_other =
      Q25d == 1 &
      rowSums(across(c(Q25b, Q25e:Q25l))) > 0
  )
revolut_cluster_summary <- bank_groups |>
  group_by(cluster) |>
  summarise(

    n_cluster = n(),

    revolut_only = sum(revolut_only, na.rm = TRUE),
    nlb_revolut = sum(nlb_revolut, na.rm = TRUE),
    otp_revolut = sum(otp_revolut, na.rm = TRUE),
    revolut_other = sum(revolut_other, na.rm = TRUE),

    revolut_only_pct = round(100 * revolut_only / n_cluster, 1),
    nlb_revolut_pct = round(100 * nlb_revolut / n_cluster, 1),
    otp_revolut_pct = round(100 * otp_revolut / n_cluster, 1),
    revolut_other_pct = round(100 * revolut_other / n_cluster, 1)

  )

revolut_cluster_summary
NA
library(tidyr)

revolut_cluster_summary |>
  select(
    cluster,
    revolut_only_pct,
    nlb_revolut_pct,
    otp_revolut_pct,
    revolut_other_pct
  ) |>
  pivot_longer(
    cols = -cluster,
    names_to = "group",
    values_to = "percent"
  )
NA
library(dplyr)

bank_segments <- data_cluster_profile_5 |>
  mutate(across(Q25a:Q25l, as.numeric)) |>
  mutate(

    segment = case_when(

      Q25c == 1 & Q25d == 0 & Q25a == 0 ~ "NLB only",
      Q25d == 1 & Q25c == 0 & Q25a == 0 ~ "Revolut only",
      Q25a == 1 & Q25c == 0 & Q25d == 0 ~ "OTP only",

      Q25c == 1 & Q25d == 1 & Q25a == 0 ~ "NLB + Revolut",
      Q25c == 1 & Q25a == 1 & Q25d == 0 ~ "NLB + OTP",
      Q25a == 1 & Q25d == 1 & Q25c == 0 ~ "OTP + Revolut",

      Q25a == 1 & Q25c == 1 & Q25d == 1 ~ "NLB + Revolut + OTP",

      TRUE ~ "None of these three"
    )
  )
segment_table <- bank_segments |>
  group_by(cluster, segment) |>
  summarise(n = n(), .groups = "drop") |>
  group_by(cluster) |>
  mutate(
    percent = round(100 * n / sum(n), 1)
  ) |>
  arrange(cluster, desc(percent))

segment_table
conversion_table <- data_cluster_profile_5 |>
  mutate(across(Q25a:Q25l, as.numeric)) |>
  group_by(cluster) |>
  summarise(

    cluster_size = n(),

    revolut_users = sum(Q25d == 1, na.rm = TRUE),
    nlb_users = sum(Q25c == 1, na.rm = TRUE),

    nlb_revolut_users = sum(Q25c == 1 & Q25d == 1, na.rm = TRUE),

    revolut_without_nlb = sum(Q25d == 1 & Q25c == 0, na.rm = TRUE),

    revolut_users_pct = round(100 * revolut_users / cluster_size, 1),

    revolut_without_nlb_pct =
      round(100 * revolut_without_nlb / cluster_size, 1)

  )

conversion_table

##Cluster 3

library(readxl)
library(dplyr)
library(tidyr)
library(tibble)
library(ggplot2)

## 1. Load and clean data ----

raw_sheet <- read_excel(
  "Questionnaire_results_EN.xlsx",
  sheet = "Podatki",
  col_names = FALSE
)

var_names <- raw_sheet |>
  slice(1) |>
  unlist(use.names = FALSE) |>
  as.character()

question_text <- raw_sheet |>
  slice(2) |>
  unlist(use.names = FALSE) |>
  as.character()

data_raw <- raw_sheet |>
  slice(-(1:2))

names(data_raw) <- var_names

data_raw <- data_raw |>
  mutate(respondent_id = row_number()) |>
  relocate(respondent_id)

data_clean <- data_raw |>
  mutate(across(everything(),
                ~ replace(as.character(.), as.character(.) == "-1", NA))) |>
  filter(!is.na(Q22), !is.na(Q23))

data_clean <- data_clean |>
  mutate(
    across(
      Q13a:Q15g,
      ~ as.numeric(replace(., . == "8", NA))
    )
  )

## 2. Rebuild the 5 respondent clusters (same logic as before) ----

cluster_data <- data_clean |>
  select(Q6a, Q6b, Q6d, Q6e, Q6h, Q6i,
         Q8a, Q8b, Q8c, Q8d, Q8e) |>
  mutate(across(everything(), as.numeric))

cluster_data_complete <- cluster_data |>
  drop_na()

pca_cluster <- prcomp(cluster_data_complete, scale. = TRUE)
pca_scores_2 <- as.data.frame(pca_cluster$x[, 1:2])

set.seed(123)
k5_pca2 <- kmeans(pca_scores_2, centers = 5, nstart = 25)

data_clean_complete <- data_clean |>
  filter(
    !is.na(Q6a), !is.na(Q6b), !is.na(Q6d), !is.na(Q6e), !is.na(Q6h), !is.na(Q6i),
    !is.na(Q8a), !is.na(Q8b), !is.na(Q8c), !is.na(Q8d), !is.na(Q8e)
  )

data_cluster <- data_clean_complete |>
  mutate(
    cluster = factor(
      k5_pca2$cluster,
      levels = c(1, 2, 3, 4, 5),
      labels = c(
        "Skeptical support seekers",
        "Cautious guidance seekers",
        "Feature-oriented adopters",   # cluster 3
        "AI-resistant independents",
        "AI-enthusiastic guidance seekers"
      )
    )
  )

## 3. Hard-code banks and perception items (Q13–Q15) ----

# Q13: innovation, Q14: customer support, Q15: reliability
percept_vars <- c(
  "Q13a","Q13b","Q13c","Q13d","Q13e","Q13f","Q13g",
  "Q14a","Q14b","Q14c","Q14d","Q14e","Q14f","Q14g",
  "Q15a","Q15b","Q15c","Q15d","Q15e","Q15f","Q15g"
)

# explicit mapping from column suffix (a–g) to bank name
bank_lookup <- tibble(
  bank_code  = letters[1:7],
  bank_label = c("OTP",
                 "Gorenjska Banka",
                 "NLB",
                 "Revolut",
                 "N26",
                 "Intesa SanPaolo",
                 "UniCredit")
)

# helper table describing each Q13–15 variable
qmeta <- tibble(variable = percept_vars) %>%
  mutate(
    qcode     = substr(variable, 1, 3),     # Q13, Q14, Q15
    bank_code = substr(variable, 4, 4)      # a–g
  ) %>%
  left_join(bank_lookup, by = "bank_code") %>%
  mutate(
    attribute = case_when(
      qcode == "Q13" ~ "innovation",
      qcode == "Q14" ~ "customer_support",
      qcode == "Q15" ~ "reliability",
      TRUE ~ qcode
    )
  )

## 4. Build bank x attribute matrix for cluster 3 ----

cluster3 <- data_cluster %>%
  filter(cluster == "Feature-oriented adopters")

cluster3_percept <- cluster3 %>%
  select(all_of(percept_vars)) %>%
  mutate(across(everything(), as.numeric))

means_c3 <- cluster3_percept %>%
  summarise(across(everything(), ~ mean(.x, na.rm = TRUE)))

means_long <- means_c3 %>%
  pivot_longer(cols = everything(),
               names_to = "variable",
               values_to = "mean_score") %>%
  left_join(qmeta, by = "variable")

bank_attr_mat <- means_long %>%
  group_by(bank_label, attribute) %>%
  summarise(mean_score = mean(mean_score), .groups = "drop") %>%
  pivot_wider(
    id_cols = bank_label,
    names_from = attribute,
    values_from = mean_score
  ) %>%
  as.data.frame()

rownames(bank_attr_mat) <- bank_attr_mat$bank_label
bank_attr_mat$bank_label <- NULL

## 5. PCA for banks (cluster 3) ----

pca_banks_c3 <- prcomp(bank_attr_mat, scale. = TRUE)

scores_c3 <- as.data.frame(pca_banks_c3$x[, 1:2])
scores_c3$bank_label <- rownames(scores_c3)

loadings_c3 <- as.data.frame(pca_banks_c3$rotation[, 1:2])
loadings_c3$attribute <- rownames(loadings_c3)

arrow_scale <- 1.5
loadings_c3 <- loadings_c3 %>%
  mutate(PC1 = PC1 * arrow_scale,
         PC2 = PC2 * arrow_scale)

## 6. Plot: perceptual map of banks – cluster 3 ----

ggplot() +
  geom_point(data = scores_c3,
             aes(x = PC1, y = PC2),
             size = 2.8, colour = "black") +
  geom_text(data = scores_c3,
            aes(x = PC1, y = PC2, label = bank_label),
            vjust = -0.7, size = 3.2) +
  geom_segment(data = loadings_c3,
               aes(x = 0, y = 0, xend = PC1, yend = PC2),
               arrow = arrow(length = unit(0.2, "cm")),
               colour = "grey40") +
  geom_text(data = loadings_c3,
            aes(x = PC1, y = PC2, label = attribute),
            hjust = 0.5, vjust = -0.4, colour = "grey40", size = 3) +
  geom_hline(yintercept = 0, linetype = "dashed", colour = "grey75") +
  geom_vline(xintercept = 0, linetype = "dashed", colour = "grey75") +
  coord_equal(xlim = c(min(scores_c3$PC1) - 0.8, max(scores_c3$PC1) + 0.8),
              ylim = c(min(scores_c3$PC2) - 0.8, max(scores_c3$PC2) + 0.8),
              expand = TRUE) +
  labs(
    title = "Perceptual Map of Banks – Cluster 3",
    x = "Overall Digital Banking Performance",
    y = "Customer Support vs. Innovation"
  ) +
  theme_minimal(base_size = 12) +
  theme(
    plot.title = element_text(hjust = 0.5, face = "bold"),
    panel.grid.minor = element_blank()
  )

bank_attr_mat
# loadings for each attribute on PC1 and PC2
load_table <- as.data.frame(pca_banks_c3$rotation[, 1:2])
load_table$attribute <- rownames(load_table)
rownames(load_table) <- NULL

load_table
# bank attribute means we already had:
bank_attr_mat   # rows = banks, cols = innovation, customer_support, reliability

# join with scores on PC2
bank_pc2 <- scores_c3 %>%
  select(bank_label, PC2) %>%
  left_join(
    bank_attr_mat %>%
      tibble::rownames_to_column("bank_label"),
    by = "bank_label"
  )

bank_pc2
NA
bank_pc2 <- scores_c3 %>%
  select(bank_label, PC2) %>%
  left_join(
    bank_attr_mat %>%
      tibble::rownames_to_column("bank_label"),
    by = "bank_label"
  )

bank_pc2
# load_table: columns PC1, PC2, attribute (innovation, customer_support, reliability)
load_table

# 1) put PC2 loadings into a named vector
pc2_load <- load_table$PC2
names(pc2_load) <- load_table$attribute

# 2) compute contribution scores: attribute_mean * PC2 loading
contrib_pc2 <- bank_pc2 %>%
  mutate(
    contrib_customer_support = customer_support * pc2_load["customer_support"],
    contrib_innovation       = innovation       * pc2_load["innovation"],
    contrib_reliability      = reliability      * pc2_load["reliability"]
  )

contrib_pc2
NA
contrib_pc2_long <- contrib_pc2 %>%
  select(bank_label,
         contrib_customer_support,
         contrib_innovation,
         contrib_reliability) %>%
  tidyr::pivot_longer(
    cols = starts_with("contrib_"),
    names_to = "attribute",
    values_to = "contribution"
  ) %>%
  mutate(attribute = gsub("contrib_", "", attribute))

contrib_pc2_long
NA
ggplot(contrib_pc2_long,
       aes(x = attribute, y = contribution, fill = attribute)) +
  geom_col(show.legend = FALSE) +
  facet_wrap(~ bank_label) +
  theme_minimal() +
  labs(
    title = "Approximate attribute contributions to Dimension 2 (cluster 3)",
    x = "Attribute",
    y = "Contribution to Dim2"
  )

load_table3 <- as.data.frame(pca_banks_c3$rotation[, 1:2])
load_table3$attribute <- rownames(load_table3)
rownames(load_table3) <- NULL

load_table3
NA

Cluster 5

## Cluster 5: bank x attribute matrix ----

cluster5 <- data_cluster %>%
  filter(cluster == "AI-enthusiastic guidance seekers")   # cluster 5 label

cluster5_percept <- cluster5 %>%
  select(all_of(percept_vars)) %>%
  mutate(across(everything(), as.numeric))

means_c5 <- cluster5_percept %>%
  summarise(across(everything(), ~ mean(.x, na.rm = TRUE)))

means_c5_long <- means_c5 %>%
  pivot_longer(cols = everything(),
               names_to = "variable",
               values_to = "mean_score") %>%
  left_join(qmeta, by = "variable")

bank_attr_mat5 <- means_c5_long %>%
  group_by(bank_label, attribute) %>%
  summarise(mean_score = mean(mean_score), .groups = "drop") %>%
  pivot_wider(
    id_cols = bank_label,
    names_from = attribute,
    values_from = mean_score
  ) %>%
  as.data.frame()

rownames(bank_attr_mat5) <- bank_attr_mat5$bank_label
bank_attr_mat5$bank_label <- NULL
## PCA for banks – cluster 5 ----

pca_banks_c5 <- prcomp(bank_attr_mat5, scale. = TRUE)

scores_c5 <- as.data.frame(pca_banks_c5$x[, 1:2])
scores_c5$bank_label <- rownames(scores_c5)

loadings_c5 <- as.data.frame(pca_banks_c5$rotation[, 1:2])
loadings_c5$attribute <- rownames(loadings_c5)

arrow_scale <- 1.5
loadings_c5 <- loadings_c5 %>%
  mutate(PC1 = PC1 * arrow_scale,
         PC2 = PC2 * arrow_scale)

## Plot: perceptual map for cluster 5 ----

ggplot() +
  geom_point(data = scores_c5,
             aes(x = PC1, y = PC2),
             size = 2.8, colour = "black") +
  geom_text(data = scores_c5,
            aes(x = PC1, y = PC2, label = bank_label),
            vjust = -0.7, size = 3.2) +
  geom_segment(data = loadings_c5,
               aes(x = 0, y = 0, xend = PC1, yend = PC2),
               arrow = arrow(length = unit(0.2, "cm")),
               colour = "grey40") +
  geom_text(data = loadings_c5,
            aes(x = PC1, y = PC2, label = attribute),
            hjust = 0.5, vjust = -0.4, colour = "grey40", size = 3) +
  geom_hline(yintercept = 0, linetype = "dashed", colour = "grey75") +
  geom_vline(xintercept = 0, linetype = "dashed", colour = "grey75") +
  coord_equal(xlim = c(min(scores_c5$PC1) - 0.8, max(scores_c5$PC1) + 0.8),
              ylim = c(min(scores_c5$PC2) - 0.8, max(scores_c5$PC2) + 0.8),
              expand = TRUE) +
  labs(
    title = "Perceptual Map of Banks – Cluster 5",
    x = "Overall Digital Banking Performance",
    y = "Customer Support vs. Relaibility"
  ) +
  theme_minimal(base_size = 12) +
  theme(
    plot.title = element_text(hjust = 0.5, face = "bold"),
    panel.grid.minor = element_blank()
  )

## Loadings table for cluster 5 ----
load_table5 <- as.data.frame(pca_banks_c5$rotation[, 1:2])
load_table5$attribute <- rownames(load_table5)
rownames(load_table5) <- NULL

# PC2 loadings as named vector
pc2_load5 <- load_table5$PC2
names(pc2_load5) <- load_table5$attribute

# join PC2 scores with attribute means
bank_pc2_5 <- scores_c5 %>%
  select(bank_label, PC2) %>%
  left_join(
    bank_attr_mat5 %>% tibble::rownames_to_column("bank_label"),
    by = "bank_label"
  )

# contribution scores
contrib_pc2_5 <- bank_pc2_5 %>%
  mutate(
    contrib_customer_support = customer_support * pc2_load5["customer_support"],
    contrib_innovation       = innovation       * pc2_load5["innovation"],
    contrib_reliability      = reliability      * pc2_load5["reliability"]
  )

contrib_pc2_5
NA
contrib_pc2_5_long <- contrib_pc2_5 %>%
  select(bank_label,
         contrib_customer_support,
         contrib_innovation,
         contrib_reliability) %>%
  pivot_longer(
    cols = starts_with("contrib_"),
    names_to = "attribute",
    values_to = "contribution"
  ) %>%
  mutate(attribute = gsub("contrib_", "", attribute))

ggplot(contrib_pc2_5_long,
       aes(x = attribute, y = contribution, fill = attribute)) +
  geom_col(show.legend = FALSE) +
  facet_wrap(~ bank_label) +
  theme_minimal() +
  labs(
    title = "Approximate attribute contributions to Dimension 2 (cluster 5)",
    x = "Attribute",
    y = "Contribution to Dim2"
  )

bank_pc2_5 <- scores_c5 %>%
  select(bank_label, PC2) %>%
  left_join(
    bank_attr_mat5 %>%
      tibble::rownames_to_column("bank_label"),
    by = "bank_label"
  )

bank_pc2_5
NA
# loadings for cluster 5 (PC1 and PC2)
load_table5 <- as.data.frame(pca_banks_c5$rotation[, 1:2])
load_table5$attribute <- rownames(load_table5)
rownames(load_table5) <- NULL

load_table5
## loadings for cluster 5 already in load_table5
# pc2_load5: named vector of PC2 loadings
pc2_load5 <- load_table5$PC2
names(pc2_load5) <- load_table5$attribute

## bank_pc2_5 already created like this:
# bank_pc2_5 <- scores_c5 %>%
#   select(bank_label, PC2) %>%
#   left_join(
#     bank_attr_mat5 %>% tibble::rownames_to_column("bank_label"),
#     by = "bank_label"
#   )

contrib_pc2_5 <- bank_pc2_5 %>%
  mutate(
    contrib_customer_support = customer_support * pc2_load5["customer_support"],
    contrib_innovation       = innovation       * pc2_load5["innovation"],
    contrib_reliability      = reliability      * pc2_load5["reliability"]
  )

contrib_pc2_5
NA

Cluster 2

## Cluster 2: bank x attribute matrix ----

cluster2 <- data_cluster %>%
  filter(cluster == "Cautious guidance seekers")   # cluster 2 label

cluster2_percept <- cluster2 %>%
  select(all_of(percept_vars)) %>%
  mutate(across(everything(), as.numeric))

means_c2 <- cluster2_percept %>%
  summarise(across(everything(), ~ mean(.x, na.rm = TRUE)))

means_c2_long <- means_c2 %>%
  pivot_longer(cols = everything(),
               names_to = "variable",
               values_to = "mean_score") %>%
  left_join(qmeta, by = "variable")

bank_attr_mat2 <- means_c2_long %>%
  group_by(bank_label, attribute) %>%
  summarise(mean_score = mean(mean_score), .groups = "drop") %>%
  pivot_wider(
    id_cols = bank_label,
    names_from = attribute,
    values_from = mean_score
  ) %>%
  as.data.frame()

rownames(bank_attr_mat2) <- bank_attr_mat2$bank_label
bank_attr_mat2$bank_label <- NULL
## PCA for banks – cluster 2 ----

pca_banks_c2 <- prcomp(bank_attr_mat2, scale. = TRUE)

scores_c2 <- as.data.frame(pca_banks_c2$x[, 1:2])
scores_c2$bank_label <- rownames(scores_c2)

loadings_c2 <- as.data.frame(pca_banks_c2$rotation[, 1:2])
loadings_c2$attribute <- rownames(loadings_c2)

arrow_scale <- 1.5
loadings_c2 <- loadings_c2 %>%
  mutate(PC1 = PC1 * arrow_scale,
         PC2 = PC2 * arrow_scale)

## Plot: perceptual map for cluster 2 ----

ggplot() +
  geom_point(data = scores_c2,
             aes(x = PC1, y = PC2),
             size = 2.8, colour = "black") +
  geom_text(data = scores_c2,
            aes(x = PC1, y = PC2, label = bank_label),
            vjust = -0.7, size = 3.2) +
  geom_segment(data = loadings_c2,
               aes(x = 0, y = 0, xend = PC1, yend = PC2),
               arrow = arrow(length = unit(0.2, "cm")),
               colour = "grey40") +
  geom_text(data = loadings_c2,
            aes(x = PC1, y = PC2, label = attribute),
            hjust = 0.5, vjust = -0.4, colour = "grey40", size = 3) +
  geom_hline(yintercept = 0, linetype = "dashed", colour = "grey75") +
  geom_vline(xintercept = 0, linetype = "dashed", colour = "grey75") +
  coord_equal(xlim = c(min(scores_c2$PC1) - 0.8, max(scores_c2$PC1) + 0.8),
              ylim = c(min(scores_c2$PC2) - 0.8, max(scores_c2$PC2) + 0.8),
              expand = TRUE) +
  labs(
    title = "Perceptual Map of Banks – Cluster 2",
    x = "Overall Digital Banking Performance",
    y = "Customer Support vs. Reliability"
  ) +
  theme_minimal(base_size = 12) +
  theme(
    plot.title = element_text(hjust = 0.5, face = "bold"),
    panel.grid.minor = element_blank()
  )

bank_pc2_2 <- scores_c2 %>%
  select(bank_label, PC2) %>%
  left_join(
    bank_attr_mat2 %>%
      tibble::rownames_to_column("bank_label"),
    by = "bank_label"
  )

bank_pc2_2
NA
load_table2 <- as.data.frame(pca_banks_c2$rotation[, 1:2])
load_table2$attribute <- rownames(load_table2)
rownames(load_table2) <- NULL

load_table2
NA
pc2_load2 <- load_table2$PC2
names(pc2_load2) <- load_table2$attribute

contrib_pc2_2 <- bank_pc2_2 %>%
  mutate(
    contrib_customer_support = customer_support * pc2_load2["customer_support"],
    contrib_innovation       = innovation       * pc2_load2["innovation"],
    contrib_reliability      = reliability      * pc2_load2["reliability"]
  )

contrib_pc2_2
NA
library(ggplot2)
library(dplyr)
library(tidyr)

## PC2 loadings for cluster 2
pc2_load2 <- load_table2$PC2
names(pc2_load2) <- load_table2$attribute

## Contribution scores table for cluster 2
contrib_pc2_2 <- bank_pc2_2 %>%
  mutate(
    contrib_customer_support = customer_support * pc2_load2["customer_support"],
    contrib_innovation       = innovation       * pc2_load2["innovation"],
    contrib_reliability      = reliability      * pc2_load2["reliability"]
  )

## Long format for plotting
contrib_pc2_2_long <- contrib_pc2_2 %>%
  select(bank_label,
         contrib_customer_support,
         contrib_innovation,
         contrib_reliability) %>%
  pivot_longer(
    cols = starts_with("contrib_"),
    names_to = "attribute",
    values_to = "contribution"
  ) %>%
  mutate(attribute = gsub("contrib_", "", attribute))

## Bar plot
ggplot(contrib_pc2_2_long,
       aes(x = attribute, y = contribution, fill = attribute)) +
  geom_col(show.legend = FALSE) +
  facet_wrap(~ bank_label) +
  theme_minimal() +
  labs(
    title = "Approximate attribute contributions to Dimension 2 – Cluster 2",
    x = "Attribute",
    y = "Contribution to Dim2"
  )

library(dplyr)
library(purrr)
library(tidyr)

# make sure logical combo vars are numeric for testing
bank_groups_test <- bank_groups |>
  mutate(
    across(
      c(revolut_only, nlb_revolut, otp_revolut, revolut_other),
      ~ as.integer(.)
    )
  )

# helper: chi-square with simulated p-value fallback if expected counts are small
run_cluster_sig_test <- function(data, var_name) {
  tab <- table(data$cluster, data[[var_name]])

  chi <- suppressWarnings(chisq.test(tab))

  if (any(chi$expected < 5)) {
    chi_sim <- chisq.test(tab, simulate.p.value = TRUE, B = 10000)

    tibble(
      group = var_name,
      test = "Chi-square (simulated p-value)",
      statistic = unname(chi$statistic),
      p_value = chi_sim$p.value
    )
  } else {
    tibble(
      group = var_name,
      test = "Chi-square",
      statistic = unname(chi$statistic),
      p_value = chi$p.value
    )
  }
}

# overall significance for each bank-combo across clusters
combo_significance <- bind_rows(
  lapply(
    c("revolut_only", "nlb_revolut", "otp_revolut", "revolut_other"),
    function(x) run_cluster_sig_test(bank_groups_test, x)
  )
) |>
  mutate(p_adj_bh = p.adjust(p_value, method = "BH")) |>
  arrange(p_value)

combo_significance
pairwise_cluster_props <- function(data, var_name) {
  counts <- data |>
    group_by(cluster) |>
    summarise(
      users = sum(.data[[var_name]], na.rm = TRUE),
      n = n(),
      .groups = "drop"
    )

  pw <- pairwise.prop.test(
    x = counts$users,
    n = counts$n,
    p.adjust.method = "BH"
  )

  as.data.frame(as.table(pw$p.value)) |>
    filter(!is.na(Freq)) |>
    rename(
      cluster_1 = Var1,
      cluster_2 = Var2,
      p_adj_bh = Freq
    ) |>
    mutate(group = var_name, .before = 1)
}

pairwise_cluster_props(bank_groups_test, "revolut_only")
pairwise_cluster_props(bank_groups_test, "nlb_revolut")
pairwise_cluster_props(bank_groups_test, "otp_revolut")
pairwise_cluster_props(bank_groups_test, "revolut_other")
segment_tab <- table(bank_segments$cluster, bank_segments$segment)

segment_test <- chisq.test(segment_tab, simulate.p.value = TRUE, B = 10000)
segment_test

    Pearson's Chi-squared test with simulated p-value (based on 10000
    replicates)

data:  segment_tab
X-squared = 47.692, df = NA, p-value = 0.009699
run_segment_sig <- function(data, segment_name) {
  tmp <- data |>
    mutate(in_segment = as.integer(segment == segment_name))

  run_cluster_sig_test(tmp, "in_segment") |>
    mutate(segment = segment_name, .before = 1) |>
    select(segment, everything(), -group)
}

segment_significance <- bind_rows(
  run_segment_sig(bank_segments, "Revolut only"),
  run_segment_sig(bank_segments, "NLB + Revolut"),
  run_segment_sig(bank_segments, "OTP + Revolut")
) |>
  mutate(p_adj_bh = p.adjust(p_value, method = "BH"))

segment_significance
pairwise_segment_props <- function(data, segment_name) {
  counts <- data |>
    mutate(in_segment = as.integer(segment == segment_name)) |>
    group_by(cluster) |>
    summarise(
      users = sum(in_segment, na.rm = TRUE),
      n = n(),
      .groups = "drop"
    )

  pw <- pairwise.prop.test(
    x = counts$users,
    n = counts$n,
    p.adjust.method = "BH"
  )

  as.data.frame(as.table(pw$p.value)) |>
    filter(!is.na(Freq)) |>
    rename(
      cluster_1 = Var1,
      cluster_2 = Var2,
      p_adj_bh = Freq
    ) |>
    mutate(segment = segment_name, .before = 1)
}

pairwise_segment_props(bank_segments, "Revolut only")
pairwise_segment_props(bank_segments, "NLB + Revolut")
pairwise_segment_props(bank_segments, "OTP + Revolut")
cluster_5_wants_needs <- cluster_means_pca2_5_named |>
  filter(cluster == "AI-enthusiastic guidance seekers")

cluster_5_wants_needs
library(dplyr)
library(purrr)
library(tidyr)

# keep only clusters 2, 3, and 5
bank_groups_235 <- bank_groups |>
  filter(cluster %in% c(
    "Cautious guidance seekers",
    "Feature-oriented adopters",
    "AI-enthusiastic guidance seekers"
  )) |>
  mutate(
    cluster = droplevels(cluster),
    across(
      c(revolut_only, nlb_revolut, otp_revolut, revolut_other),
      ~ as.integer(.)
    )
  )
run_cluster_sig_test <- function(data, var_name) {
  tab <- table(data$cluster, data[[var_name]])
  chi <- suppressWarnings(chisq.test(tab))
  
  if (any(chi$expected < 5)) {
    chi_sim <- chisq.test(tab, simulate.p.value = TRUE, B = 10000)
    
    tibble(
      group = var_name,
      test = "Chi-square (simulated p-value)",
      statistic = unname(chi$statistic),
      p_value = chi_sim$p.value
    )
  } else {
    tibble(
      group = var_name,
      test = "Chi-square",
      statistic = unname(chi$statistic),
      p_value = chi$p.value
    )
  }
}

overall_sig_235 <- bind_rows(
  run_cluster_sig_test(bank_groups_235, "revolut_only"),
  run_cluster_sig_test(bank_groups_235, "nlb_revolut"),
  run_cluster_sig_test(bank_groups_235, "otp_revolut"),
  run_cluster_sig_test(bank_groups_235, "revolut_other")
) |>
  mutate(p_adj_bh = p.adjust(p_value, method = "BH")) |>
  arrange(p_value)

overall_sig_235
run_pair_test <- function(data, var_name, cl1, cl2) {
  tmp <- data |>
    filter(cluster %in% c(cl1, cl2)) |>
    mutate(cluster = droplevels(cluster))
  
  counts <- tmp |>
    group_by(cluster) |>
    summarise(
      users = sum(.data[[var_name]], na.rm = TRUE),
      n = n(),
      .groups = "drop"
    )
  
  test <- prop.test(
    x = counts$users,
    n = counts$n,
    correct = FALSE
  )
  
  tibble(
    group = var_name,
    cluster_1 = cl1,
    cluster_2 = cl2,
    users_1 = counts$users[1],
    n_1 = counts$n[1],
    pct_1 = round(100 * counts$users[1] / counts$n[1], 1),
    users_2 = counts$users[2],
    n_2 = counts$n[2],
    pct_2 = round(100 * counts$users[2] / counts$n[2], 1),
    statistic = unname(test$statistic),
    p_value = test$p.value
  )
}

cluster_pairs_235 <- list(
  c("Cautious guidance seekers", "Feature-oriented adopters"),
  c("Cautious guidance seekers", "AI-enthusiastic guidance seekers"),
  c("Feature-oriented adopters", "AI-enthusiastic guidance seekers")
)

bank_vars <- c("revolut_only", "nlb_revolut", "otp_revolut", "revolut_other")

pairwise_sig_235 <- map_dfr(bank_vars, function(v) {
  map_dfr(cluster_pairs_235, function(p) {
    run_pair_test(bank_groups_235, v, p[1], p[2])
  })
}) |>
  group_by(group) |>
  mutate(p_adj_bh = p.adjust(p_value, method = "BH")) |>
  ungroup() |>
  arrange(group, p_value)

pairwise_sig_235
pairwise_sig_235 |>
  filter(p_adj_bh < 0.05)
bank_groups_235 |>
  group_by(cluster) |>
  summarise(
    n_cluster = n(),
    revolut_only_n = sum(revolut_only, na.rm = TRUE),
    revolut_only_pct = round(100 * revolut_only_n / n_cluster, 1),
    nlb_revolut_n = sum(nlb_revolut, na.rm = TRUE),
    nlb_revolut_pct = round(100 * nlb_revolut_n / n_cluster, 1),
    otp_revolut_n = sum(otp_revolut, na.rm = TRUE),
    otp_revolut_pct = round(100 * otp_revolut_n / n_cluster, 1),
    revolut_other_n = sum(revolut_other, na.rm = TRUE),
    revolut_other_pct = round(100 * revolut_other_n / n_cluster, 1)
  )
---
title: "R Notebook"
output: html_notebook
---

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```{r}
library(readxl)
library(dplyr)
library(tidyr)
library(tibble)
```


```{r}
raw_sheet <- read_excel(
  "Questionnaire_results_EN.xlsx",
  sheet = "Podatki",
  col_names = FALSE
)

raw_sheet
```

```{r}
var_names <- raw_sheet |>
  slice(1) |>
  unlist(use.names = FALSE) |>
  as.character()

question_text <- raw_sheet |>
  slice(2) |>
  unlist(use.names = FALSE) |>
  as.character()

data_raw <- raw_sheet |>
  slice(-(1:2))

names(data_raw) <- var_names

data_raw <- data_raw |>
  mutate(respondent_id = row_number()) |>
  relocate(respondent_id)

glimpse(data_raw)
```

```{r}
question_lookup <- tibble(
  variable = var_names,
  question = question_text
)

question_lookup
```

```{r}
data_clean <- data_raw |>
  mutate(
    across(
      everything(),
      ~ replace(as.character(.), as.character(.) == "-1", NA)
    )
  )

glimpse(data_clean)
```

```{r}
ids_removed <- data_clean |>
  filter(is.na(Q22) | is.na(Q23)) |>
  pull(respondent_id)

ids_removed
```

```{r}
data_clean <- data_clean |>
  filter(!is.na(Q22), !is.na(Q23))

nrow(data_raw)
nrow(data_clean)
```

```{r}
missing_summary <- data_clean |>
  summarise(across(everything(), ~ sum(is.na(.)))) |>
  pivot_longer(
    cols = everything(),
    names_to = "variable",
    values_to = "n_missing"
  ) |>
  arrange(desc(n_missing))

missing_summary
```
```{r}
question_lookup |> 
  filter(grepl("Q13|Q14|Q15", variable))
```

```{r}
data_clean |>
  select(Q13a:Q15g) |>
  summarise(across(everything(), ~ paste(sort(unique(.)), collapse = ", "))) |>
  pivot_longer(
    cols = everything(),
    names_to = "variable",
    values_to = "values"
  )
```
```{r}
data_clean <- data_clean |>
  mutate(
    across(
      Q13a:Q15g,
      ~ as.numeric(replace(., . == "8", NA))
    )
  )
```

```{r}
data_clean |>
  select(Q13a:Q15g) |>
  summarise(across(everything(), ~ paste(sort(unique(.)), collapse = ", "))) |>
  pivot_longer(
    cols = everything(),
    names_to = "variable",
    values_to = "values"
  )
```
```{r}
bank_means <- tibble(
  bank = c("OTP", "Gorenjska Banka", "NLB", "Revolut", "N26", "Intesa SanPaolo", "UniCredit"),
  innovation = c(
    mean(data_clean$Q13a, na.rm = TRUE),
    mean(data_clean$Q13b, na.rm = TRUE),
    mean(data_clean$Q13c, na.rm = TRUE),
    mean(data_clean$Q13d, na.rm = TRUE),
    mean(data_clean$Q13e, na.rm = TRUE),
    mean(data_clean$Q13f, na.rm = TRUE),
    mean(data_clean$Q13g, na.rm = TRUE)
  ),
  customer_support = c(
    mean(data_clean$Q14a, na.rm = TRUE),
    mean(data_clean$Q14b, na.rm = TRUE),
    mean(data_clean$Q14c, na.rm = TRUE),
    mean(data_clean$Q14d, na.rm = TRUE),
    mean(data_clean$Q14e, na.rm = TRUE),
    mean(data_clean$Q14f, na.rm = TRUE),
    mean(data_clean$Q14g, na.rm = TRUE)
  ),
  reliability = c(
    mean(data_clean$Q15a, na.rm = TRUE),
    mean(data_clean$Q15b, na.rm = TRUE),
    mean(data_clean$Q15c, na.rm = TRUE),
    mean(data_clean$Q15d, na.rm = TRUE),
    mean(data_clean$Q15e, na.rm = TRUE),
    mean(data_clean$Q15f, na.rm = TRUE),
    mean(data_clean$Q15g, na.rm = TRUE)
  )
)

bank_means
```

```{r}
pca_result <- prcomp(
  bank_means[, c("innovation", "customer_support", "reliability")],
  scale. = TRUE
)

pca_result
```

```{r}
bank_coordinates <- as.data.frame(pca_result$x)
bank_coordinates$bank <- bank_means$bank

bank_coordinates
```

```{r}
plot(
  bank_coordinates$PC1,
  bank_coordinates$PC2,
  xlab = "PC1",
  ylab = "PC2",
  main = "Perception Map of Banks",
  pch = 19
)

text(
  bank_coordinates$PC1,
  bank_coordinates$PC2,
  labels = bank_coordinates$bank,
  pos = 3
)
```
```{r}
library(ggplot2)

ggplot(bank_coordinates, aes(x = PC1, y = PC2, label = bank)) +
  geom_point(size = 3) +
  geom_text(vjust = -0.7) +
  labs(
    title = "Perception Map of Banks",
    x = "Dimension 1",
    y = "Dimension 2"
  ) +
  theme_minimal()
```
```{r}
library(FactoMineR)
library(factoextra)
```
```{r}
mat <- bank_means |>
  tibble::column_to_rownames("bank") |>
  as.matrix()

pca_bank <- FactoMineR::PCA(mat, scale.unit = TRUE, graph = FALSE)

factoextra::fviz_pca_ind(
  pca_bank,
  repel = TRUE
) +
  ggplot2::ggtitle("Perceptual map of banks (Q13–Q15)")
```
```{r}
factoextra::fviz_pca_biplot(
  pca_bank,
  repel = TRUE,
  col.var = "gray30"
) +
  ggplot2::ggtitle("Perceptual map of banks with dimensions (Q13–Q15)")
```
```{r}
factoextra::fviz_pca_biplot(
  pca_bank,
  repel = TRUE,
  col.var = "gray35",
  col.ind = "steelblue",
  pointsize = 3
) +
  ggplot2::ggtitle("Perceptual Map of Banks") +
  ggplot2::xlab("Overall Digital Banking Performance") +
  ggplot2::ylab("Customer Support vs Innovation") +
  ggplot2::theme_minimal() +
  ggplot2::theme(
    plot.title = ggplot2::element_text(face = "bold"),
    axis.title = ggplot2::element_text(face = "bold")
  )
```
```{r}
factoextra::fviz_pca_biplot(
  pca_bank,
  repel = TRUE,
  col.var = "gray30"
) +
  ggplot2::ggtitle("Perceptual map of banks with dimensions (Q13–Q15)") +
  ggplot2::xlab("Dim1 (90.1%): Overall Digital Banking Performance") +
  ggplot2::ylab("Dim2 (8.5%): Customer Support vs Innovation")
```
```{r}
data_clean |>
  select(Q6a, Q6b, Q6d, Q6e, Q6h, Q6i, Q8a, Q8b, Q8c, Q8d, Q8e) |>
  summarise(across(everything(), ~ paste(sort(unique(.)), collapse = ", "))) |>
  pivot_longer(
    cols = everything(),
    names_to = "variable",
    values_to = "values"
  )
```
```{r}
cluster_data <- data_clean |>
  select(Q6a, Q6b, Q6d, Q6e, Q6h, Q6i, Q8a, Q8b, Q8c, Q8d, Q8e) |>
  mutate(across(everything(), as.numeric))

glimpse(cluster_data)
```

```{r}
cluster_data |>
  summarise(across(everything(), ~ sum(is.na(.)))) |>
  pivot_longer(
    cols = everything(),
    names_to = "variable",
    values_to = "n_missing"
  )
```
```{r}
cluster_data_complete <- cluster_data |>
  tidyr::drop_na()

nrow(cluster_data)
nrow(cluster_data_complete)
```
```{r}
cluster_scaled <- scale(cluster_data_complete)

cluster_scaled
```
```{r}
library(factoextra)

fviz_nbclust(cluster_scaled, kmeans, method = "wss")
```
```{r}
fviz_nbclust(cluster_scaled, kmeans, method = "silhouette")
```
```{r}
install.packages("NbClust")

library(NbClust)

nb <- NbClust(
  data = cluster_scaled,
  distance = "euclidean",
  min.nc = 2,
  max.nc = 6,
  method = "kmeans"
)
```
```{r}
set.seed(123)

k2 <- kmeans(cluster_scaled, centers = 2, nstart = 25)

k2
```
```{r}
cluster_profile <- cluster_data_complete |>
  mutate(cluster = factor(k2$cluster))

cluster_profile
```
```{r}
cluster_means <- cluster_profile |>
  group_by(cluster) |>
  summarise(across(everything(), mean))

cluster_means
```
```{r}
cluster_means_long <- cluster_means |>
  pivot_longer(
    cols = -cluster,
    names_to = "variable",
    values_to = "mean_score"
  )

ggplot(cluster_means_long, aes(x = variable, y = mean_score, group = cluster, color = cluster)) +
  geom_line(linewidth = 1) +
  geom_point(size = 2) +
  labs(
    title = "Cluster Profiles",
    x = "Variables",
    y = "Mean score"
  ) +
  theme_minimal()
```
```{r}
factoextra::fviz_cluster(
  k2,
  data = cluster_scaled,
  ellipse.type = "norm",
  repel = TRUE,
  show.clust.cent = TRUE
)
```
```{r}
factoextra::fviz_cluster(
  k2,
  data = cluster_scaled,
  geom = "point",
  ellipse.type = "norm",
  show.clust.cent = TRUE
)
```
```{r}
cor(cluster_data_complete)
```

```{r}
install.packages("hopkins")
library(hopkins)
```
```{r}
hopkins(cluster_data_complete)
```

```{r}
hc <- hclust(dist(cluster_scaled), method = "ward.D2")
```
```{r}
plot(hc, labels = FALSE, hang = -1, main = "Dendrogram")
```

```{r}
summary(aov(Q6a ~ cluster, data = cluster_profile))
```

```{r}
summary(aov(Q8a ~ cluster, data = cluster_profile))
```

```{r}
anova_results <- lapply(names(cluster_data_complete), function(var) {
  model <- aov(as.formula(paste(var, "~ cluster")), data = cluster_profile)
  data.frame(
    variable = var,
    p_value = summary(model)[[1]][["Pr(>F)"]][1]
  )
})

anova_results <- do.call(rbind, anova_results)

anova_results
```


3 groups now !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

```{r}
set.seed(123)

k3 <- kmeans(cluster_scaled, centers = 3, nstart = 25)

k3
```

```{r}
set.seed(123)

k4 <- kmeans(cluster_scaled, centers = 4, nstart = 25)

k4
```

```{r}
cluster_profile_4 <- cluster_data_complete |>
  mutate(cluster = factor(k4$cluster))
```

```{r}
cluster_means_4 <- cluster_profile_4 |>
  group_by(cluster) |>
  summarise(across(everything(), mean))

cluster_means_4
```

```{r}
factoextra::fviz_cluster(
  k4,
  data = cluster_scaled,
  geom = "point",
  ellipse.type = "none",
  show.clust.cent = TRUE
)
```

```{r}
cluster_sizes_4 <- data.frame(table(k4$cluster))
cluster_sizes_4$percent <- round(100 * cluster_sizes_4$Freq / sum(cluster_sizes_4$Freq), 1)

cluster_sizes_4
```

```{r}
cluster_means_4_long <- cluster_means_4 |>
  pivot_longer(
    cols = -cluster,
    names_to = "variable",
    values_to = "mean_score"
  )

ggplot(
  cluster_means_4_long,
  aes(x = variable, y = mean_score, group = cluster, color = cluster)
) +
  geom_line(linewidth = 1) +
  geom_point(size = 2) +
  labs(
    title = "Cluster Profiles (4-Cluster Solution)",
    x = "Variables",
    y = "Mean score",
    color = "Cluster"
  ) +
  theme_minimal()
```

```{r}
pca_cluster <- prcomp(cluster_data_complete, scale. = TRUE)

summary(pca_cluster)
```

```{r}
round(pca_cluster$rotation[, 1:3], 3)
```

```{r}
pca_scores_2 <- as.data.frame(pca_cluster$x[, 1:2])

head(pca_scores_2)
```

```{r}
fviz_nbclust(pca_scores_2, kmeans, method = "wss")
```

```{r}
fviz_nbclust(pca_scores_2, kmeans, method = "silhouette")
```

```{r}
nb_pca2 <- NbClust(
  data = pca_scores_2,
  distance = "euclidean",
  min.nc = 2,
  max.nc = 6,
  method = "kmeans"
)
```

```{r}
set.seed(123)

k4_pca2 <- kmeans(pca_scores_2, centers = 4, nstart = 25)

k4_pca2
```

```{r}
factoextra::fviz_cluster(
  k4_pca2,
  data = pca_scores_2,
  geom = "point",
  ellipse.type = "none",
  show.clust.cent = TRUE
)
```

```{r}
cluster_profile_pca4 <- cluster_data_complete |>
  mutate(cluster = factor(k4_pca2$cluster))
```

```{r}
cluster_means_pca4 <- cluster_profile_pca4 |>
  group_by(cluster) |>
  summarise(across(everything(), mean))

cluster_means_pca4
```

```{r}
pca_plot_data <- pca_scores_2 |>
  mutate(
    cluster = factor(
      k4_pca2$cluster,
      levels = c(1, 2, 3, 4),
      labels = c(
        "Cautious guidance seekers",
        "AI skeptics",
        "AI-enthusiastic guidance seekers",
        "Feature-oriented adopters"
      )
    )
  )

ggplot(pca_plot_data, aes(x = PC1, y = PC2, color = cluster, shape = cluster)) +
  geom_point(size = 2.5, alpha = 0.8) +
  labs(
    title = "PCA-based 4-cluster solution",
    x = "PC1",
    y = "PC2",
    color = "Cluster",
    shape = "Cluster"
  ) +
  theme_minimal()
```

```{r}
cluster_means_pca4_named <- cluster_means_pca4 |>
  mutate(
    cluster = factor(
      cluster,
      levels = c(1, 2, 3, 4),
      labels = c(
        "Cautious guidance seekers",
        "AI skeptics",
        "AI-enthusiastic guidance seekers",
        "Feature-oriented adopters"
      )
    )
  )

cluster_means_pca4_long <- cluster_means_pca4_named |>
  pivot_longer(
    cols = -cluster,
    names_to = "variable",
    values_to = "mean_score"
  )

ggplot(
  cluster_means_pca4_long,
  aes(x = variable, y = mean_score, group = cluster, color = cluster)
) +
  geom_line(linewidth = 1) +
  geom_point(size = 2) +
  labs(
    title = "Cluster Profiles (PCA-based 4-Cluster Solution)",
    x = "Variables",
    y = "Mean score",
    color = "Cluster"
  ) +
  theme_minimal()
```

```{r}
cor_matrix <- cor(cluster_data_complete)

round(cor_matrix, 3)
```

```{r}
library(corrplot)

corrplot(
  cor(cluster_data_complete),
  method = "color",
  type = "upper",
  tl.col = "black",
  tl.srt = 45
)
```

```{r}
pca_variance <- data.frame(
  Component = paste0("PC", 1:length(pca_cluster$sdev)),
  Eigenvalue = pca_cluster$sdev^2,
  Proportion_Variance = (pca_cluster$sdev^2) / sum(pca_cluster$sdev^2),
  Cumulative_Variance = cumsum((pca_cluster$sdev^2) / sum(pca_cluster$sdev^2))
)

pca_variance$Eigenvalue <- round(pca_variance$Eigenvalue, 3)
pca_variance$Proportion_Variance <- round(pca_variance$Proportion_Variance, 3)
pca_variance$Cumulative_Variance <- round(pca_variance$Cumulative_Variance, 3)

pca_variance
```

```{r}
pca_loadings <- as.data.frame(pca_cluster$rotation[, 1:3])

pca_loadings$Variable <- rownames(pca_loadings)
rownames(pca_loadings) <- NULL

pca_loadings <- pca_loadings[, c("Variable", "PC1", "PC2", "PC3")]

pca_loadings$PC1 <- round(pca_loadings$PC1, 3)
pca_loadings$PC2 <- round(pca_loadings$PC2, 3)
pca_loadings$PC3 <- round(pca_loadings$PC3, 3)

pca_loadings
```

```{r}
hopkins(cluster_data_complete)
```

```{r}
distance_matrix <- dist(cluster_data_complete, method = "euclidean")

distance_matrix
```

```{r}
distance_matrix_table <- as.matrix(distance_matrix)

distance_matrix_table[1:10, 1:10]
```

```{r}
hc <- hclust(dist(cluster_data_complete), method = "ward.D2")

plot(hc, labels = FALSE, hang = -1, main = "Dendrogram")
```

```{r}
cluster_sizes_pca4 <- data.frame(table(k4_pca2$cluster))
cluster_sizes_pca4$Percent <- round(
  100 * cluster_sizes_pca4$Freq / sum(cluster_sizes_pca4$Freq),
  1
)

names(cluster_sizes_pca4) <- c("Cluster", "Size", "Percent")

cluster_sizes_pca4
```

```{r}
cluster_sizes_pca4 <- data.frame(table(k4_pca2$cluster))
cluster_sizes_pca4$Percent <- round(
  100 * cluster_sizes_pca4$Freq / sum(cluster_sizes_pca4$Freq),
  1
)

cluster_sizes_pca4$Cluster_Name <- c(
  "Cautious guidance seekers",
  "AI skeptics",
  "AI-enthusiastic guidance seekers",
  "Feature-oriented adopters"
)

cluster_sizes_pca4 <- cluster_sizes_pca4[, c("Var1", "Cluster_Name", "Freq", "Percent")]
names(cluster_sizes_pca4) <- c("Cluster", "Cluster_Name", "Size", "Percent")

cluster_sizes_pca4
```

```{r}
cluster_mean_table <- cluster_means_pca4 |>
  mutate(
    cluster = factor(
      cluster,
      levels = c(1,2,3,4),
      labels = c(
        "Cautious guidance seekers",
        "AI skeptics",
        "AI-enthusiastic guidance seekers",
        "Feature-oriented adopters"
      )
    )
  )

cluster_mean_table
```

```{r}
ggplot(pca_plot_data, aes(x = PC1, y = PC2, color = cluster, shape = cluster)) +
  geom_point(size = 2.5, alpha = 0.8) +
  labs(
    title = "Customer Segmentation Based on PCA Clustering",
    x = "Interest in AI banking features (PC1)",
    y = "Need for financial guidance (PC2)",
    color = "Cluster",
    shape = "Cluster"
  ) +
  theme_minimal()
```

```{r}
set.seed(123)

k5_pca2 <- kmeans(pca_scores_2, centers = 5, nstart = 25)

k5_pca2
```

```{r}
cluster_profile_pca5 <- cluster_data_complete |>
  mutate(cluster = factor(k5_pca2$cluster))
```

```{r}
cluster_means_pca5 <- cluster_profile_pca5 |>
  group_by(cluster) |>
  summarise(across(everything(), mean))

cluster_means_pca5
```

```{r}
cluster_means_pca5_named <- cluster_means_pca5 |>
  mutate(
    cluster = factor(
      cluster,
      levels = c(1, 2, 3, 4, 5),
      labels = c(
        "Skeptical support seekers",
        "Cautious guidance seekers",
        "Feature-oriented adopters",
        "AI-resistant independents",
        "AI-enthusiastic guidance seekers"
      )
    )
  )

cluster_means_pca5_long <- cluster_means_pca5_named |>
  pivot_longer(
    cols = -cluster,
    names_to = "variable",
    values_to = "mean_score"
  )

ggplot(
  cluster_means_pca5_long,
  aes(x = variable, y = mean_score, group = cluster, color = cluster)
) +
  geom_line(linewidth = 1) +
  geom_point(size = 2) +
  labs(
    title = "Cluster Profiles (PCA-based 5-Cluster Solution)",
    x = "Variables",
    y = "Mean score",
    color = "Cluster"
  ) +
  theme_minimal()
```

```{r}
cluster_sizes_pca5 <- data.frame(table(k5_pca2$cluster))
cluster_sizes_pca5$Percent <- round(
  100 * cluster_sizes_pca5$Freq / sum(cluster_sizes_pca5$Freq),
  1
)

cluster_sizes_pca5$Cluster_Name <- c(
  "Skeptical support seekers",
  "Cautious guidance seekers",
  "Feature-oriented adopters",
  "AI-resistant independents",
  "AI-enthusiastic guidance seekers"
)

cluster_sizes_pca5 <- cluster_sizes_pca5[, c("Var1", "Cluster_Name", "Freq", "Percent")]
names(cluster_sizes_pca5) <- c("Cluster", "Cluster_Name", "Size", "Percent")

cluster_sizes_pca5
```

```{r}
cluster_profile_pca5 <- cluster_data_complete |>
  mutate(cluster = factor(k5_pca2$cluster))

cluster_means_pca5 <- cluster_profile_pca5 |>
  group_by(cluster) |>
  summarise(across(everything(), mean))

cluster_mean_table_pca5 <- cluster_means_pca5 |>
  mutate(
    cluster = factor(
      cluster,
      levels = c(1, 2, 3, 4, 5),
      labels = c(
        "Skeptical support seekers",
        "Cautious guidance seekers",
        "Feature-oriented adopters",
        "AI-resistant independents",
        "AI-enthusiastic guidance seekers"
      )
    )
  )

cluster_mean_table_pca5
```

```{r}
pca_plot_data_5 <- pca_scores_2 |>
  mutate(
    cluster = factor(
      k5_pca2$cluster,
      levels = c(1, 2, 3, 4, 5),
      labels = c(
        "Skeptical support seekers",
        "Cautious guidance seekers",
        "Feature-oriented adopters",
        "AI-resistant independents",
        "AI-enthusiastic guidance seekers"
      )
    )
  )

ggplot(pca_plot_data_5, aes(x = PC1, y = PC2, color = cluster, shape = cluster)) +
  geom_point(size = 2.5, alpha = 0.8) +
  labs(
    title = "PCA-based 5-Cluster Solution",
    x = "PC1",
    y = "PC2",
    color = "Cluster",
    shape = "Cluster"
  ) +
  theme_minimal()
```

```{r}
pca_plot_data_5 <- pca_scores_2 |>
  mutate(
    cluster = factor(
      k5_pca2$cluster,
      levels = c(1, 2, 3, 4, 5),
      labels = c(
        "Skeptical support seekers",
        "Cautious guidance seekers",
        "Feature-oriented adopters",
        "AI-resistant independents",
        "AI-enthusiastic guidance seekers"
      )
    )
  )

ggplot(pca_plot_data_5, aes(x = PC1, y = PC2, color = cluster, shape = cluster)) +
  geom_point(size = 2.8, alpha = 0.8) +
  labs(
    title = "Customer Segmentation (PCA-based 5-Cluster Solution)",
    x = "Interest in AI Banking Features (PC1)",
    y = "Need for Financial Guidance (PC2)",
    color = "Cluster",
    shape = "Cluster"
  ) +
  theme_minimal()
```

```{r}
cluster_profile_pca2_5 <- pca_scores_2 |>
  mutate(cluster = factor(k5_pca2$cluster))

cluster_means_pca2_5 <- cluster_profile_pca2_5 |>
  group_by(cluster) |>
  summarise(across(everything(), mean))

cluster_means_pca2_5_named <- cluster_means_pca2_5 |>
  mutate(
    cluster = factor(
      cluster,
      levels = c(1, 2, 3, 4, 5),
      labels = c(
        "Skeptical support seekers",
        "Cautious guidance seekers",
        "Feature-oriented adopters",
        "AI-resistant independents",
        "AI-enthusiastic guidance seekers"
      )
    )
  ) |>
  rename(
    `Interest in AI Banking Features` = PC1,
    `Need for Financial Guidance` = PC2
  )

cluster_means_pca2_5_long <- cluster_means_pca2_5_named |>
  pivot_longer(
    cols = -cluster,
    names_to = "component",
    values_to = "mean_score"
  )

ggplot(
  cluster_means_pca2_5_long,
  aes(x = component, y = mean_score, group = cluster, color = cluster)
) +
  geom_line(linewidth = 1) +
  geom_point(size = 2) +
  labs(
    title = "Cluster Profiles (5-Cluster Solution Based on 2 PCs)",
    x = "Principal Components",
    y = "Mean component score",
    color = "Cluster"
  ) +
  theme_minimal()
```

```{r}
cluster_profile_pca2_4 <- pca_scores_2 |>
  mutate(cluster = factor(k4_pca2$cluster))

cluster_means_pca2_4 <- cluster_profile_pca2_4 |>
  group_by(cluster) |>
  summarise(across(everything(), mean))

cluster_means_pca2_4_named <- cluster_means_pca2_4 |>
  mutate(
    cluster = factor(
      cluster,
      levels = c(1, 2, 3, 4),
      labels = c(
        "Cautious guidance seekers",
        "AI skeptics",
        "AI-enthusiastic guidance seekers",
        "Feature-oriented adopters"
      )
    )
  ) |>
  rename(
    `Interest in AI Banking Features` = PC1,
    `Need for Financial Guidance` = PC2
  )

cluster_means_pca2_4_long <- cluster_means_pca2_4_named |>
  pivot_longer(
    cols = -cluster,
    names_to = "component",
    values_to = "mean_score"
  )

ggplot(
  cluster_means_pca2_4_long,
  aes(x = component, y = mean_score, group = cluster, color = cluster)
) +
  geom_line(linewidth = 1) +
  geom_point(size = 2) +
  labs(
    title = "Cluster Profiles (4-Cluster Solution Based on 2 PCs)",
    x = "Principal Components",
    y = "Mean component score",
    color = "Cluster"
  ) +
  theme_minimal()
```

```{r}
data_clean_complete <- data_clean |>
  filter(
    !is.na(Q6a), !is.na(Q6b), !is.na(Q6d), !is.na(Q6e), !is.na(Q6h), !is.na(Q6i),
    !is.na(Q8a), !is.na(Q8b), !is.na(Q8c), !is.na(Q8d), !is.na(Q8e)
  )
```

```{r}
data_cluster_profile <- data_clean_complete |>
  mutate(cluster = factor(k4_pca2$cluster))
```

```{r}
data_cluster_profile_5 <- data_clean_complete |>
  mutate(cluster = factor(k5_pca2$cluster))
```

```{r}
data_cluster_profile_5 |>
  group_by(cluster) |>
  summarise(mean_age = mean(as.numeric(Q21), na.rm = TRUE))
```

```{r}
data_cluster_profile_5 <- data_cluster_profile_5 |>
  mutate(age = 2026 - as.numeric(Q21))
```

```{r}
data_cluster_profile_5 |>
  group_by(cluster) |>
  summarise(mean_age = mean(age, na.rm = TRUE))
```

```{r}
data_cluster_profile_5 |>
  group_by(cluster) |>
  summarise(mobile_banking_use = mean(as.numeric(Q2), na.rm = TRUE))
```

```{r}
data_cluster_profile_5 |>
  group_by(cluster) |>
  summarise(trust = mean(as.numeric(Q24), na.rm = TRUE))
```

```{r}
names(data_cluster_profile_5)
```

```{r}
data_cluster_profile_5 |>
  group_by(cluster, Q22) |>
  summarise(n = n(), .groups = "drop") |>
  group_by(cluster) |>
  mutate(percent = round(100 * n / sum(n), 1))
```

```{r}
data_cluster_profile_5 |>
  group_by(cluster) |>
  summarise(Q17_mean = mean(as.numeric(Q17), na.rm = TRUE))
```

```{r}
gender_profile_5 <- data_cluster_profile_5 |>
  group_by(cluster, Q22) |>
  summarise(n = n(), .groups = "drop") |>
  group_by(cluster) |>
  mutate(percent = round(100 * n / sum(n), 1)) |>
  ungroup()

male_profile_5 <- gender_profile_5 |>
  filter(Q22 == "1") |>
  select(cluster, male_percent = percent)

female_profile_5 <- gender_profile_5 |>
  filter(Q22 == "2") |>
  select(cluster, female_percent = percent)

profiling_table_5 <- data_cluster_profile_5 |>
  group_by(cluster) |>
  summarise(
    mean_birth_year = mean(as.numeric(Q21), na.rm = TRUE),
    mean_age = mean(age, na.rm = TRUE),
    mobile_banking_use = mean(as.numeric(Q2), na.rm = TRUE),
    trust = mean(as.numeric(Q24), na.rm = TRUE),
    Q17_mean = mean(as.numeric(Q17), na.rm = TRUE)
  ) |>
  left_join(male_profile_5, by = "cluster") |>
  left_join(female_profile_5, by = "cluster") |>
  mutate(
    cluster = factor(
      cluster,
      levels = c(1, 2, 3, 4, 5),
      labels = c(
        "Skeptical support seekers",
        "Cautious guidance seekers",
        "Feature-oriented adopters",
        "AI-resistant independents",
        "AI-enthusiastic guidance seekers"
      )
    )
  ) |>
  mutate(across(-cluster, ~ round(.x, 2)))

profiling_table_5
```

```{r}
pc_loadings <- as.data.frame(pca_cluster$rotation[, 1:2])

pc_loadings$Variable <- rownames(pc_loadings)
rownames(pc_loadings) <- NULL

pc_loadings <- pc_loadings[, c("Variable", "PC1", "PC2")]

pc_loadings$PC1 <- round(pc_loadings$PC1, 3)
pc_loadings$PC2 <- round(pc_loadings$PC2, 3)

pc_loadings
```

```{r}
cluster_bank_counts <- data_cluster_profile_5 |>
  group_by(cluster) |>
  summarise(
    OTP = sum(Q25a == 1, na.rm = TRUE),
    Gorenjska_Banka = sum(Q25b == 1, na.rm = TRUE),
    NLB = sum(Q25c == 1, na.rm = TRUE),
    Revolut = sum(Q25d == 1, na.rm = TRUE),
    N26 = sum(Q25e == 1, na.rm = TRUE),
    Intesa = sum(Q25f == 1, na.rm = TRUE),
    UniCredit = sum(Q25g == 1, na.rm = TRUE),
    Regional_Bank = sum(Q25h == 1, na.rm = TRUE),
    Workers_Savings = sum(Q25i == 1, na.rm = TRUE),
    Sparkasse = sum(Q25j == 1, na.rm = TRUE),
    Addiko = sum(Q25k == 1, na.rm = TRUE)
  )

cluster_bank_counts
```

```{r}
library(dplyr)
library(tidyr)
library(ggplot2)

cluster_bank_counts <- data_cluster_profile_5 |>
  group_by(cluster) |>
  summarise(
    OTP = sum(Q25a == 1, na.rm = TRUE),
    Gorenjska_Banka = sum(Q25b == 1, na.rm = TRUE),
    NLB = sum(Q25c == 1, na.rm = TRUE),
    Revolut = sum(Q25d == 1, na.rm = TRUE),
    N26 = sum(Q25e == 1, na.rm = TRUE),
    Intesa_SanPaolo = sum(Q25f == 1, na.rm = TRUE),
    UniCredit = sum(Q25g == 1, na.rm = TRUE),
    Regional_Bank = sum(Q25h == 1, na.rm = TRUE),
    Workers_Savings = sum(Q25i == 1, na.rm = TRUE),
    Sparkasse = sum(Q25j == 1, na.rm = TRUE),
    Addiko = sum(Q25k == 1, na.rm = TRUE),
    Other = sum(Q25l == 1, na.rm = TRUE)
  )

cluster_bank_counts
```

```{r}
cluster_bank_long <- cluster_bank_counts |>
  pivot_longer(
    cols = -cluster,
    names_to = "bank",
    values_to = "count"
  )

cluster_bank_long
```

```{r}
ggplot(cluster_bank_long, aes(x = bank, y = factor(cluster), fill = count)) +
  geom_tile(color = "white") +
  geom_text(aes(label = count), size = 4) +
  labs(
    title = "Banks Used by Each Cluster",
    x = "Bank",
    y = "Cluster",
    fill = "Count"
  ) +
  theme_minimal() +
  theme(
    axis.text.x = element_text(angle = 45, hjust = 1)
  )
```

```{r}
cluster_bank_percent_long <- cluster_bank_long |>
  group_by(cluster) |>
  mutate(percent = round(100 * count / sum(count), 1)) |>
  ungroup()

cluster_bank_percent_long
```

```{r}
ggplot(cluster_bank_percent_long, aes(x = bank, y = factor(cluster), fill = percent)) +
  geom_tile(color = "white") +
  geom_text(aes(label = paste0(percent, "%")), size = 4) +
  labs(
    title = "Bank Usage by Cluster (%)",
    x = "Bank",
    y = "Cluster",
    fill = "Percent"
  ) +
  theme_minimal() +
  theme(
    axis.text.x = element_text(angle = 45, hjust = 1)
  )
```

```{r}
library(dplyr)
library(tidyr)
library(ggplot2)

cluster_bank_counts_named <- data_cluster_profile_5 |>
  mutate(
    cluster = factor(
      cluster,
      levels = c(1, 2, 3, 4, 5),
      labels = c(
        "Skeptical support seekers",
        "Cautious guidance seekers",
        "Feature-oriented adopters",
        "AI-resistant independents",
        "AI-enthusiastic guidance seekers"
      )
    )
  ) |>
  filter(cluster %in% c(
    "Cautious guidance seekers",
    "Feature-oriented adopters",
    "AI-enthusiastic guidance seekers"
  )) |>
  group_by(cluster) |>
  summarise(
    OTP = sum(Q25a == 1, na.rm = TRUE),
    Gorenjska_Banka = sum(Q25b == 1, na.rm = TRUE),
    NLB = sum(Q25c == 1, na.rm = TRUE),
    Revolut = sum(Q25d == 1, na.rm = TRUE),
    N26 = sum(Q25e == 1, na.rm = TRUE),
    Intesa_SanPaolo = sum(Q25f == 1, na.rm = TRUE),
    UniCredit = sum(Q25g == 1, na.rm = TRUE),
    Regional_Bank = sum(Q25h == 1, na.rm = TRUE),
    Workers_Savings = sum(Q25i == 1, na.rm = TRUE),
    Sparkasse = sum(Q25j == 1, na.rm = TRUE),
    Addiko = sum(Q25k == 1, na.rm = TRUE),
    Other = sum(Q25l == 1, na.rm = TRUE)
  )

cluster_bank_percent_long_named <- cluster_bank_counts_named |>
  pivot_longer(
    cols = -cluster,
    names_to = "bank",
    values_to = "count"
  ) |>
  group_by(cluster) |>
  mutate(percent = round(100 * count / sum(count), 1)) |>
  ungroup()

ggplot(
  cluster_bank_percent_long_named,
  aes(x = bank, y = cluster, fill = percent)
) +
  geom_tile(color = "white") +
  geom_text(aes(label = paste0(percent, "%")), color = "white", size = 4) +
  labs(
    title = "Bank Usage by Selected Clusters (%)",
    x = "Bank",
    y = "Cluster",
    fill = "Percent"
  ) +
  theme_minimal() +
  theme(
    axis.text.x = element_text(angle = 45, hjust = 1)
  )
```

```{r}
library(dplyr)
library(tibble)
library(FactoMineR)
library(factoextra)
library(ggplot2)

data_cluster_profile_5 <- data_clean_complete |>
  mutate(cluster = factor(k5_pca2$cluster))

make_perception_map <- function(data, cluster_values, title_text) {
  
  subset_data <- data |>
    filter(cluster %in% cluster_values) |>
    mutate(
      across(Q13a:Q15g, as.numeric)
    )
  
  bank_means <- tibble(
    bank = c("OTP", "Gorenjska Banka", "NLB", "Revolut", "N26", "Intesa SanPaolo", "UniCredit"),
    innovation = c(
      mean(subset_data$Q13a, na.rm = TRUE),
      mean(subset_data$Q13b, na.rm = TRUE),
      mean(subset_data$Q13c, na.rm = TRUE),
      mean(subset_data$Q13d, na.rm = TRUE),
      mean(subset_data$Q13e, na.rm = TRUE),
      mean(subset_data$Q13f, na.rm = TRUE),
      mean(subset_data$Q13g, na.rm = TRUE)
    ),
    customer_support = c(
      mean(subset_data$Q14a, na.rm = TRUE),
      mean(subset_data$Q14b, na.rm = TRUE),
      mean(subset_data$Q14c, na.rm = TRUE),
      mean(subset_data$Q14d, na.rm = TRUE),
      mean(subset_data$Q14e, na.rm = TRUE),
      mean(subset_data$Q14f, na.rm = TRUE),
      mean(subset_data$Q14g, na.rm = TRUE)
    ),
    reliability = c(
      mean(subset_data$Q15a, na.rm = TRUE),
      mean(subset_data$Q15b, na.rm = TRUE),
      mean(subset_data$Q15c, na.rm = TRUE),
      mean(subset_data$Q15d, na.rm = TRUE),
      mean(subset_data$Q15e, na.rm = TRUE),
      mean(subset_data$Q15f, na.rm = TRUE),
      mean(subset_data$Q15g, na.rm = TRUE)
    )
  )
  
  mat <- bank_means |>
    column_to_rownames("bank") |>
    as.matrix()
  
  pca_bank <- FactoMineR::PCA(mat, scale.unit = TRUE, graph = FALSE)
  
  factoextra::fviz_pca_biplot(
    pca_bank,
    repel = TRUE,
    col.var = "gray30"
  ) +
    ggplot2::ggtitle(title_text) +
    ggplot2::xlab("Dim1: Overall Digital Banking Performance") +
    ggplot2::ylab("Dim2: Customer Support vs Innovation")
}
```

```{r}
make_perception_map(
  data = data_cluster_profile_5,
  cluster_values = c("2"),
  title_text = "Perceptual Map of Banks - Cluster 2"
)
```

```{r}
make_perception_map(
  data = data_cluster_profile_5,
  cluster_values = c("3"),
  title_text = "Perceptual Map of Banks - Cluster 3"
)
```

```{r}
make_perception_map(
  data = data_cluster_profile_5,
  cluster_values = c("5"),
  title_text = "Perceptual Map of Banks - Cluster 5"
)
```

```{r}
make_perception_map(
  data = data_cluster_profile_5,
  cluster_values = c("2", "3", "5"),
  title_text = "Perceptual Map of Banks - Clusters 2, 3, and 5"
)
```

```{r}
library(dplyr)
library(tidyr)
library(ggplot2)

cluster_q4_table_named <- data_cluster_profile_5 |>
  mutate(
    cluster = factor(
      cluster,
      levels = c(1, 2, 3, 4, 5),
      labels = c(
        "Skeptical support seekers",
        "Cautious guidance seekers",
        "Feature-oriented adopters",
        "AI-resistant independents",
        "AI-enthusiastic guidance seekers"
      )
    )
  ) |>
  filter(cluster %in% c(
    "Cautious guidance seekers",
    "Feature-oriented adopters",
    "AI-enthusiastic guidance seekers"
  )) |>
  group_by(cluster, Q4) |>
  summarise(n = n(), .groups = "drop") |>
  group_by(cluster) |>
  mutate(percent = round(100 * n / sum(n), 1)) |>
  ungroup() |>
  mutate(
    info_source = case_when(
      Q4 == "1" ~ "Web browsers",
      Q4 == "2" ~ "Family / friends",
      Q4 == "3" ~ "Financial media",
      Q4 == "4" ~ "ChatGPT / AI models",
      Q4 == "5" ~ "Other",
      TRUE ~ as.character(Q4)
    )
  ) |>
  select(cluster, info_source, n, percent)

cluster_q4_table_named
```

```{r}
ggplot(cluster_q4_table_named, aes(x = info_source, y = cluster, fill = percent)) +
  geom_tile(color = "white") +
  geom_text(aes(label = paste0(percent, "%")), color = "white", size = 4) +
  labs(
    title = "Information Source by Selected Clusters (%)",
    x = "Information Source",
    y = "Cluster",
    fill = "Percent"
  ) +
  theme_minimal() +
  theme(
    axis.text.x = element_text(angle = 45, hjust = 1)
  )
```

```{r}
cluster_q4_wide <- cluster_q4_table_named |>
  select(cluster, info_source, percent) |>
  pivot_wider(
    names_from = info_source,
    values_from = percent,
    values_fill = 0
  )

cluster_q4_wide
```

```{r}
library(dplyr)

cluster_vars <- c(
  "Q6a", "Q6b", "Q6d", "Q6e", "Q6h", "Q6i",
  "Q8a", "Q8b", "Q8c", "Q8d", "Q8e"
)

cluster_validation <- data_clean |>
  filter(
    !is.na(Q6a), !is.na(Q6b), !is.na(Q6d), !is.na(Q6e), !is.na(Q6h), !is.na(Q6i),
    !is.na(Q8a), !is.na(Q8b), !is.na(Q8c), !is.na(Q8d), !is.na(Q8e)
  ) |>
  mutate(
    cluster = factor(k5_pca2$cluster),
    across(all_of(cluster_vars), as.numeric)
  )
```

```{r}
anova_results <- lapply(cluster_vars, function(var) {
  model <- aov(as.formula(paste(var, "~ cluster")), data = cluster_validation)
  data.frame(
    variable = var,
    p_value = summary(model)[[1]][["Pr(>F)"]][1]
  )
})

anova_results <- do.call(rbind, anova_results)
anova_results$p_adjusted <- p.adjust(anova_results$p_value, method = "holm")

anova_results
```

```{r}
cluster_means_validation <- cluster_validation |>
  group_by(cluster) |>
  summarise(
    across(all_of(cluster_vars), ~ mean(.x, na.rm = TRUE)),
    .groups = "drop"
  )

cluster_means_validation
```

```{r}
library(dplyr)

age_data <- data_clean |>
  filter(
    !is.na(Q6a), !is.na(Q6b), !is.na(Q6d), !is.na(Q6e), !is.na(Q6h), !is.na(Q6i),
    !is.na(Q8a), !is.na(Q8b), !is.na(Q8c), !is.na(Q8d), !is.na(Q8e)
  ) |>
  mutate(
    cluster = factor(
      k5_pca2$cluster,
      levels = c(1, 2, 3, 4, 5),
      labels = c(
        "Skeptical support seekers",
        "Cautious guidance seekers",
        "Feature-oriented adopters",
        "AI-resistant independents",
        "AI-enthusiastic guidance seekers"
      )
    )
  ) |>
  filter(!is.na(Q21)) |>
  mutate(
    age = 2026 - as.numeric(Q21)
  )
```

```{r}
age_summary <- age_data |>
  group_by(cluster) |>
  summarise(
    n = n(),
    mean_age = mean(age, na.rm = TRUE),
    sd_age = sd(age, na.rm = TRUE),
    median_age = median(age, na.rm = TRUE),
    min_age = min(age, na.rm = TRUE),
    max_age = max(age, na.rm = TRUE)
  )

age_summary
```

```{r}
age_anova <- aov(age ~ cluster, data = age_data)
summary(age_anova)
```

```{r}
TukeyHSD(age_anova)
```

```{r}
age_summary <- age_data |>
  group_by(cluster) |>
  summarise(
    n = n(),
    mean_age = mean(age, na.rm = TRUE),
    sd_age = sd(age, na.rm = TRUE),
    median_age = median(age, na.rm = TRUE),
    min_age = min(age, na.rm = TRUE),
    max_age = max(age, na.rm = TRUE)
  )

age_summary
```

```{r}
age_summary
```

```{r}
library(dplyr)

gender_data <- data_clean |>
  filter(
    !is.na(Q6a), !is.na(Q6b), !is.na(Q6d), !is.na(Q6e), !is.na(Q6h), !is.na(Q6i),
    !is.na(Q8a), !is.na(Q8b), !is.na(Q8c), !is.na(Q8d), !is.na(Q8e)
  ) |>
  mutate(
    cluster = factor(
      k5_pca2$cluster,
      levels = c(1, 2, 3, 4, 5),
      labels = c(
        "Skeptical support seekers",
        "Cautious guidance seekers",
        "Feature-oriented adopters",
        "AI-resistant independents",
        "AI-enthusiastic guidance seekers"
      )
    )
  ) |>
  filter(!is.na(Q22)) |>
  mutate(
    gender = factor(
      Q22,
      levels = c("1", "2"),
      labels = c("Male", "Female")
    )
  )
```

```{r}
gender_table <- table(gender_data$cluster, gender_data$gender)
gender_table
```

```{r}
gender_chisq <- chisq.test(gender_table)
gender_chisq
```

```{r}
gender_chisq$expected
```

```{r}
library(dplyr)

mobile_data <- data_clean |>
  filter(
    !is.na(Q6a), !is.na(Q6b), !is.na(Q6d), !is.na(Q6e), !is.na(Q6h), !is.na(Q6i),
    !is.na(Q8a), !is.na(Q8b), !is.na(Q8c), !is.na(Q8d), !is.na(Q8e)
  ) |>
  mutate(
    cluster = factor(
      k5_pca2$cluster,
      levels = c(1, 2, 3, 4, 5),
      labels = c(
        "Skeptical support seekers",
        "Cautious guidance seekers",
        "Feature-oriented adopters",
        "AI-resistant independents",
        "AI-enthusiastic guidance seekers"
      )
    )
  ) |>
  filter(!is.na(Q2)) |>
  mutate(
    mobile_banking_use = as.numeric(Q2)
  )
```

```{r}
mobile_data <- data_clean |>
  filter(
    !is.na(Q6a), !is.na(Q6b), !is.na(Q6d), !is.na(Q6e), !is.na(Q6h), !is.na(Q6i),
    !is.na(Q8a), !is.na(Q8b), !is.na(Q8c), !is.na(Q8d), !is.na(Q8e)
  ) |>
  mutate(
    cluster = factor(
      k5_pca2$cluster,
      levels = c(1, 2, 3, 4, 5),
      labels = c(
        "Skeptical support seekers",
        "Cautious guidance seekers",
        "Feature-oriented adopters",
        "AI-resistant independents",
        "AI-enthusiastic guidance seekers"
      )
    ),
    mobile_banking_use = as.numeric(Q2),
    mobile_banking_use = ifelse(mobile_banking_use == -2, NA, mobile_banking_use)
  ) |>
  filter(!is.na(mobile_banking_use))
```

```{r}
table(mobile_data$mobile_banking_use)
mobile_data |>
  count(cluster, mobile_banking_use)
```

```{r}
mobile_summary <- mobile_data |>
  group_by(cluster) |>
  summarise(
    n = n(),
    mean_mobile_use = mean(mobile_banking_use, na.rm = TRUE),
    sd_mobile_use = sd(mobile_banking_use, na.rm = TRUE),
    median_mobile_use = median(mobile_banking_use, na.rm = TRUE),
    min_mobile_use = min(mobile_banking_use, na.rm = TRUE),
    max_mobile_use = max(mobile_banking_use, na.rm = TRUE)
  )

mobile_summary
```

```{r}
mobile_kw <- kruskal.test(mobile_banking_use ~ cluster, data = mobile_data)
mobile_kw
```

```{r}
library(dplyr)

education_data <- data_clean |>
  filter(
    !is.na(Q6a), !is.na(Q6b), !is.na(Q6d), !is.na(Q6e), !is.na(Q6h), !is.na(Q6i),
    !is.na(Q8a), !is.na(Q8b), !is.na(Q8c), !is.na(Q8d), !is.na(Q8e)
  ) |>
  mutate(
    cluster = factor(
      k5_pca2$cluster,
      levels = c(1,2,3,4,5),
      labels = c(
        "Skeptical support seekers",
        "Cautious guidance seekers",
        "Feature-oriented adopters",
        "AI-resistant independents",
        "AI-enthusiastic guidance seekers"
      )
    ),
    education = as.numeric(Q24)
  ) |>
  filter(!is.na(education))
```

```{r}
table(education_data$education)
```

```{r}
education_data |>
  count(cluster, education)
```

```{r}
education_table <- table(education_data$cluster, education_data$education)

education_table
```

```{r}
education_chisq <- chisq.test(education_table)

education_chisq
```

```{r}
education_chisq$expected
```

```{r}
table(education_data$education)

education_table

education_chisq
```

```{r}
income_data <- data_clean |>
  filter(
    !is.na(Q6a), !is.na(Q6b), !is.na(Q6d), !is.na(Q6e), !is.na(Q6h), !is.na(Q6i),
    !is.na(Q8a), !is.na(Q8b), !is.na(Q8c), !is.na(Q8d), !is.na(Q8e)
  ) |>
  mutate(
    cluster = factor(
      k5_pca2$cluster,
      levels = c(1,2,3,4,5),
      labels = c(
        "Skeptical support seekers",
        "Cautious guidance seekers",
        "Feature-oriented adopters",
        "AI-resistant independents",
        "AI-enthusiastic guidance seekers"
      )
    ),
    income = as.numeric(Q26)
  ) |>
  filter(!is.na(income))
```

```{r}
table(income_data$income)
```

```{r}
income_data |>
  count(cluster, income)
```

```{r}
income_table <- table(income_data$cluster, income_data$income)

income_table
```

```{r}
income_chisq <- chisq.test(income_table)

income_chisq
```

```{r}
income_chisq$expected
```

```{r}
table(income_data$income)

income_table

income_chisq
```

```{r}
income_data_grouped <- data_clean |>
  filter(
    !is.na(Q6a), !is.na(Q6b), !is.na(Q6d), !is.na(Q6e), !is.na(Q6h), !is.na(Q6i),
    !is.na(Q8a), !is.na(Q8b), !is.na(Q8c), !is.na(Q8d), !is.na(Q8e)
  ) |>
  mutate(
    cluster = factor(
      k5_pca2$cluster,
      levels = c(1, 2, 3, 4, 5),
      labels = c(
        "Skeptical support seekers",
        "Cautious guidance seekers",
        "Feature-oriented adopters",
        "AI-resistant independents",
        "AI-enthusiastic guidance seekers"
      )
    ),
    income = as.numeric(Q26),
    income_group = case_when(
      income %in% c(1, 2) ~ "Low income (0–999€)",
      income %in% c(3, 4) ~ "Lower-middle income (1000–1999€)",
      income %in% c(5, 6) ~ "Upper-middle income (2000–2999€)",
      income %in% c(7, 8) ~ "High income (3000€+)",
      TRUE ~ NA_character_
    )
  ) |>
  filter(!is.na(income_group))
```

```{r}
table(income_data_grouped$income_group)
```

```{r}
income_data_grouped |>
  count(cluster, income_group)
```

```{r}
income_group_table <- table(
  income_data_grouped$cluster,
  income_data_grouped$income_group
)

income_group_table
```

```{r}
income_group_chisq <- chisq.test(income_group_table)

income_group_chisq
```

```{r}
income_group_chisq$expected
```

```{r}
income_profile <- income_data_grouped |>
  count(cluster, income_group) |>
  group_by(cluster) |>
  mutate(percent = round(100 * n / sum(n), 1)) |>
  ungroup()

income_profile
```

```{r}
income_profile_wide <- income_profile |>
  select(cluster, income_group, percent) |>
  tidyr::pivot_wider(
    names_from = income_group,
    values_from = percent,
    values_fill = 0
  )

income_profile_wide
```

```{r}
bank_data <- data_clean |>
  filter(
    !is.na(Q6a), !is.na(Q6b), !is.na(Q6d), !is.na(Q6e), !is.na(Q6h), !is.na(Q6i),
    !is.na(Q8a), !is.na(Q8b), !is.na(Q8c), !is.na(Q8d), !is.na(Q8e)
  ) |>
  mutate(
    cluster = factor(
      k5_pca2$cluster,
      levels = c(1,2,3,4,5),
      labels = c(
        "Skeptical support seekers",
        "Cautious guidance seekers",
        "Feature-oriented adopters",
        "AI-resistant independents",
        "AI-enthusiastic guidance seekers"
      )
    )
  )
```

```{r}
bank_data <- bank_data |>
  mutate(
    across(Q25a:Q25l, ~ as.numeric(.))
  )
```

```{r}
revolut_table <- table(bank_data$cluster, bank_data$Q25d)

revolut_table

chisq.test(revolut_table)
```

```{r}
banks <- c("Q25a","Q25b","Q25c","Q25d","Q25e","Q25f","Q25g","Q25h","Q25i","Q25j","Q25k","Q25l")

bank_tests <- lapply(banks, function(var){

  tab <- table(bank_data$cluster, bank_data[[var]])
  test <- chisq.test(tab)

  data.frame(
    bank = var,
    chi_square = test$statistic,
    p_value = test$p.value
  )
})

bank_tests <- do.call(rbind, bank_tests)

bank_tests
```

```{r}
otp_profile <- bank_data |>
  group_by(cluster) |>
  summarise(
    otp_users = sum(Q25a == 1, na.rm = TRUE),
    n = n(),
    otp_percent = round(100 * otp_users / n, 1)
  )

otp_profile
```

```{r}
area_data <- data_clean |>
  filter(
    !is.na(Q6a), !is.na(Q6b), !is.na(Q6d), !is.na(Q6e), !is.na(Q6h), !is.na(Q6i),
    !is.na(Q8a), !is.na(Q8b), !is.na(Q8c), !is.na(Q8d), !is.na(Q8e)
  ) |>
  mutate(
    cluster = factor(
      k5_pca2$cluster,
      levels = c(1,2,3,4,5),
      labels = c(
        "Skeptical support seekers",
        "Cautious guidance seekers",
        "Feature-oriented adopters",
        "AI-resistant independents",
        "AI-enthusiastic guidance seekers"
      )
    ),
    area = as.numeric(Q23)
  ) |>
  filter(!is.na(area))
```

```{r}
table(area_data$area)
```

```{r}
area_table <- table(area_data$cluster, area_data$area)

area_table
```

```{r}
area_chisq <- chisq.test(area_table)

area_chisq
```

```{r}
area_chisq$expected
```

```{r}
area_profile <- area_data |>
  count(cluster, area) |>
  group_by(cluster) |>
  mutate(percent = round(100 * n / sum(n), 1))

area_profile
```

```{r}
area_profile <- area_data |>
  count(cluster, area) |>
  group_by(cluster) |>
  mutate(percent = round(100 * n / sum(n), 1)) |>
  ungroup()

area_profile
```

```{r}
ai_data <- data_clean |>
  filter(
    !is.na(Q6a), !is.na(Q6b), !is.na(Q6d), !is.na(Q6e), !is.na(Q6h), !is.na(Q6i),
    !is.na(Q8a), !is.na(Q8b), !is.na(Q8c), !is.na(Q8d), !is.na(Q8e)
  ) |>
  mutate(
    cluster = factor(
      k5_pca2$cluster,
      levels = c(1,2,3,4,5),
      labels = c(
        "Skeptical support seekers",
        "Cautious guidance seekers",
        "Feature-oriented adopters",
        "AI-resistant independents",
        "AI-enthusiastic guidance seekers"
      )
    ),
    ai_use = as.numeric(Q17)
  ) |>
  filter(!is.na(ai_use))
```

```{r}
ai_summary <- ai_data |>
  group_by(cluster) |>
  summarise(
    n = n(),
    mean_ai = mean(ai_use),
    sd_ai = sd(ai_use),
    median_ai = median(ai_use),
    min_ai = min(ai_use),
    max_ai = max(ai_use)
  )

ai_summary
```

```{r}
ai_anova <- aov(ai_use ~ cluster, data = ai_data)

summary(ai_anova)
```

```{r}
TukeyHSD(ai_anova)
```

```{r}
ai_summary
summary(ai_anova)
```

```{r}
# =========================================================
# HYPOTHESIS TEST – H1c
# Q17: Likelihood of using the AI personal banking agent
# =========================================================

# H0 (Null Hypothesis):
# There are no statistically significant differences in the likelihood
# of using the AI personal banking agent (Q17) between the clusters.

# H1c (Research Hypothesis):
# Feature-oriented adopters are more likely to use the AI personal
# banking agent than cautious guidance seekers.

# =========================================================
# 1 LOAD LIBRARIES
# =========================================================

library(dplyr)
library(ggplot2)

# =========================================================
# 2 PREPARE DATA
# =========================================================

# ensure cluster variable is factor
data_cluster_profile_5$cluster <- as.factor(data_cluster_profile_5$cluster)

# convert Q17 to numeric (Likert scale)
data_cluster_profile_5 <- data_cluster_profile_5 %>%
  mutate(Q17 = as.numeric(Q17))

# =========================================================
# 3 DESCRIPTIVE STATISTICS FOR EACH CLUSTER
# =========================================================

cluster_summary_Q17 <- data_cluster_profile_5 %>%
  group_by(cluster) %>%
  summarise(
    n = n(),
    mean = mean(Q17, na.rm = TRUE),
    median = median(Q17, na.rm = TRUE),
    sd = sd(Q17, na.rm = TRUE),
    min = min(Q17, na.rm = TRUE),
    max = max(Q17, na.rm = TRUE)
  )

print(cluster_summary_Q17)

# =========================================================
# 4 TEST DIFFERENCES BETWEEN CLUSTERS
# Kruskal–Wallis test (appropriate for Likert data)
# =========================================================

kruskal_test_Q17 <- kruskal.test(Q17 ~ cluster, data = data_cluster_profile_5)

print(kruskal_test_Q17)

# =========================================================
# 5 POST-HOC TEST (PAIRWISE COMPARISON)
# =========================================================

pairwise_results_Q17 <- pairwise.wilcox.test(
  data_cluster_profile_5$Q17,
  data_cluster_profile_5$cluster,
  p.adjust.method = "bonferroni"
)

print(pairwise_results_Q17)

# =========================================================
# 6 VISUALIZATION
# =========================================================

ggplot(data_cluster_profile_5, aes(x = cluster, y = Q17)) +
  geom_boxplot() +
  labs(
    title = "Likelihood of Using AI Personal Banking Agent by Cluster",
    x = "Cluster",
    y = "Likelihood of Use (Q17)"
  ) +
  theme_minimal()
```

```{r}
# =========================================================
# 4b EFFECT SIZE FOR KRUSKAL-WALLIS
# =========================================================

library(rstatix)

effect_size_Q17 <- data_cluster_profile_5 %>%
  kruskal_effsize(Q17 ~ cluster)

print(effect_size_Q17)
```


```{r}
# =====================================================
# ASSUMPTION CHECKS – H1c
# =====================================================

shapiro.test(data_cluster_profile_5$Q17)

ggplot(data_cluster_profile_5, aes(x = Q17)) +
  geom_histogram(binwidth = 1) +
  theme_minimal()

qqnorm(data_cluster_profile_5$Q17)
qqline(data_cluster_profile_5$Q17)

library(rstatix)

levene_test(Q17 ~ cluster, data = data_cluster_profile_5)

# =====================================================
# KRUSKAL-WALLIS TEST
# =====================================================

kruskal.test(Q17 ~ cluster, data = data_cluster_profile_5)
```

##H1e
```{r}
# =========================================================
# HYPOTHESIS TEST
# Q12g – Preference for human interaction
# =========================================================

# H0 (Null Hypothesis):
# There are no statistically significant differences in preference
# for human interaction (Q12g) between the clusters.

# H1 (Research Hypothesis):
# Cautious guidance seekers show a higher preference for human
# interaction than AI-enthusiastic guidance seekers and
# feature-oriented adopters.

# =========================================================
# 1 LOAD LIBRARIES
# =========================================================

library(dplyr)
library(ggplot2)

# =========================================================
# 2 PREPARE DATA
# =========================================================

# ensure cluster variable is factor
data_cluster_profile_5$cluster <- as.factor(data_cluster_profile_5$cluster)

# convert Likert variable to numeric
data_cluster_profile_5 <- data_cluster_profile_5 %>%
  mutate(Q12g = as.numeric(Q12g))

# =========================================================
# 3 DESCRIPTIVE STATISTICS FOR EACH CLUSTER
# =========================================================

cluster_summary <- data_cluster_profile_5 %>%
  group_by(cluster) %>%
  summarise(
    n = n(),
    mean = mean(Q12g, na.rm = TRUE),
    median = median(Q12g, na.rm = TRUE),
    sd = sd(Q12g, na.rm = TRUE),
    min = min(Q12g, na.rm = TRUE),
    max = max(Q12g, na.rm = TRUE)
  )

print(cluster_summary)

# =========================================================
# 4 TEST DIFFERENCES BETWEEN CLUSTERS
# Kruskal–Wallis test (appropriate for Likert scale)
# =========================================================

kruskal_test <- kruskal.test(Q12g ~ cluster, data = data_cluster_profile_5)

print(kruskal_test)

# =========================================================
# 5 POST-HOC TEST (PAIRWISE COMPARISON BETWEEN CLUSTERS)
# =========================================================

pairwise_results <- pairwise.wilcox.test(
  data_cluster_profile_5$Q12g,
  data_cluster_profile_5$cluster,
  p.adjust.method = "bonferroni"
)

print(pairwise_results)

# =========================================================
# 6 VISUALIZATION OF DIFFERENCES BETWEEN CLUSTERS
# =========================================================

ggplot(data_cluster_profile_5, aes(x = cluster, y = Q12g)) +
  geom_boxplot() +
  labs(
    title = "Preference for Human Interaction by Cluster",
    x = "Cluster",
    y = "Preference for Human Interaction (Q12g)"
  ) +
  theme_minimal()
```


```{r}
# =====================================================
# ASSUMPTION CHECKS – H1e
# =====================================================

library(ggplot2)
library(car)

# Normality test
shapiro.test(data_cluster_profile_5$Q12g)

# Histogram
ggplot(data_cluster_profile_5, aes(x = Q12g)) +
  geom_histogram(binwidth = 1) +
  theme_minimal()

# QQ plot
qqnorm(data_cluster_profile_5$Q12g)
qqline(data_cluster_profile_5$Q12g)

# Homogeneity of variances
leveneTest(Q12g ~ cluster, data = data_cluster_profile_5)

# =====================================================
# KRUSKAL-WALLIS TEST
# =====================================================

kruskal.test(Q12g ~ cluster, data = data_cluster_profile_5)
```

```{r}
# =========================================================
# 4b EFFECT SIZE FOR KRUSKAL-WALLIS
# =========================================================

library(rstatix)

effect_size_Q12g <- data_cluster_profile_5 %>%
  kruskal_effsize(Q12g ~ cluster)

print(effect_size_Q12g)
```

```{r}
install.packages("coin")
```


```{r}
library(dplyr)
library(rstatix)
library(coin)
library(purrr)

data_cluster_profile_5 <- data_cluster_profile_5 %>%
  mutate(
    cluster = as.factor(cluster),
    Q12g = as.numeric(as.character(Q12g))
  ) %>%
  filter(!is.na(cluster), !is.na(Q12g))

cluster_pairs <- combn(levels(data_cluster_profile_5$cluster), 2, simplify = FALSE)

pairwise_effects_Q12g <- map_dfr(cluster_pairs, function(x) {
  tmp <- data_cluster_profile_5 %>%
    filter(cluster %in% x) %>%
    droplevels()

  wilcox_effsize(data = tmp, Q12g ~ cluster) %>%
    mutate(comparison = paste(x, collapse = " vs "))
})

print(pairwise_effects_Q12g)
```




```{r}
# =========================================================
# HYPOTHESIS TEST – H2d
# The higher the importance of security, the higher the
# willingness to adopt AI agents in personal banking
# Variables:
# Q12a = Importance of security
# Q17  = Willingness to use AI banking agent
# =========================================================

# H0 (Null Hypothesis):
# There is no relationship between the importance of security (Q12a)
# and willingness to adopt AI banking agents (Q17).

# H1 (Research Hypothesis):
# Higher perceived importance of security is associated with a higher
# willingness to adopt AI banking agents.

# =========================================================
# 1 LOAD LIBRARIES
# =========================================================

library(dplyr)
library(ggplot2)

# =========================================================
# 2 PREPARE DATA
# =========================================================

data_cluster_profile_5 <- data_cluster_profile_5 %>%
  mutate(
    Q12a = as.numeric(Q12a),
    Q17 = as.numeric(Q17)
  )

# =========================================================
# 3 DESCRIPTIVE STATISTICS
# =========================================================

summary_stats <- data_cluster_profile_5 %>%
  summarise(
    mean_security = mean(Q12a, na.rm = TRUE),
    sd_security = sd(Q12a, na.rm = TRUE),
    mean_AI_adoption = mean(Q17, na.rm = TRUE),
    sd_AI_adoption = sd(Q17, na.rm = TRUE)
  )

print(summary_stats)

# =========================================================
# 4 CORRELATION TEST (Spearman for ordinal data)
# =========================================================

correlation_test <- cor.test(
  data_cluster_profile_5$Q12a,
  data_cluster_profile_5$Q17,
  method = "spearman",
  use = "complete.obs"
)

print(correlation_test)

# =========================================================
# 5 VISUALIZATION
# =========================================================

ggplot(data_cluster_profile_5, aes(x = Q12a, y = Q17)) +
  geom_jitter(alpha = 0.4) +
  geom_smooth(method = "lm", se = FALSE) +
  labs(
    title = "Relationship Between Security Importance and AI Agent Adoption",
    x = "Importance of Security (Q12a)",
    y = "Willingness to Use AI Banking Agent (Q17)"
  ) +
  theme_minimal()
```

```{r}
# =====================================================
# ASSUMPTION CHECKS – H2d
# =====================================================

# Normality tests
shapiro.test(data_cluster_profile_5$Q12a)
shapiro.test(data_cluster_profile_5$Q17)

# Histograms
ggplot(data_cluster_profile_5, aes(x = Q12a)) +
  geom_histogram(binwidth = 1) +
  theme_minimal()

ggplot(data_cluster_profile_5, aes(x = Q17)) +
  geom_histogram(binwidth = 1) +
  theme_minimal()

# QQ plots
qqnorm(data_cluster_profile_5$Q12a)
qqline(data_cluster_profile_5$Q12a)

qqnorm(data_cluster_profile_5$Q17)
qqline(data_cluster_profile_5$Q17)

# =====================================================
# SPEARMAN CORRELATION
# =====================================================

cor.test(
  data_cluster_profile_5$Q12a,
  data_cluster_profile_5$Q17,
  method = "spearman"
)
```


```{r}
# =========================================================
# HYPOTHESIS TEST – H2e
# AI-enthusiastic guidance seekers perceive less financial
# stress than cautious guidance seekers and feature-oriented adopters
# Variable: Q5b
# =========================================================

library(dplyr)
library(ggplot2)

# ensure cluster is factor
data_cluster_profile_5$cluster <- as.factor(data_cluster_profile_5$cluster)

# convert Likert variable to numeric
data_cluster_profile_5 <- data_cluster_profile_5 %>%
  mutate(Q5b = as.numeric(Q5b))

# =========================================================
# 1 DESCRIPTIVE STATISTICS
# =========================================================

cluster_summary_Q5b <- data_cluster_profile_5 %>%
  group_by(cluster) %>%
  summarise(
    n = n(),
    mean = mean(Q5b, na.rm = TRUE),
    median = median(Q5b, na.rm = TRUE),
    sd = sd(Q5b, na.rm = TRUE),
    min = min(Q5b, na.rm = TRUE),
    max = max(Q5b, na.rm = TRUE)
  )

print(cluster_summary_Q5b)

# =========================================================
# 2 KRUSKAL-WALLIS TEST
# =========================================================

kruskal_test_Q5b <- kruskal.test(Q5b ~ cluster, data = data_cluster_profile_5)

print(kruskal_test_Q5b)

# =========================================================
# 3 POST-HOC TEST (PAIRWISE COMPARISON)
# =========================================================

pairwise_results_Q5b <- pairwise.wilcox.test(
  data_cluster_profile_5$Q5b,
  data_cluster_profile_5$cluster,
  p.adjust.method = "bonferroni"
)

print(pairwise_results_Q5b)

# =========================================================
# 4 VISUALIZATION
# =========================================================

ggplot(data_cluster_profile_5, aes(x = cluster, y = Q5b)) +
  geom_boxplot() +
  labs(
    title = "Perceived Financial Stress by Cluster",
    x = "Cluster",
    y = "Financial Stress (Q5b)"
  ) +
  theme_minimal()
```

```{r}
# =====================================================
# ASSUMPTION CHECKS – H2e
# =====================================================

shapiro.test(data_cluster_profile_5$Q5b)

ggplot(data_cluster_profile_5, aes(x = Q5b)) +
  geom_histogram(binwidth = 1) +
  theme_minimal()

qqnorm(data_cluster_profile_5$Q5b)
qqline(data_cluster_profile_5$Q5b)

leveneTest(Q5b ~ cluster, data = data_cluster_profile_5)

# =====================================================
# KRUSKAL-WALLIS TEST
# =====================================================

kruskal.test(Q5b ~ cluster, data = data_cluster_profile_5)
```
```{r}
library(rstatix)

effect_size_Q5b <- data_cluster_profile_5 %>%
  kruskal_effsize(Q5b ~ cluster)

print(effect_size_Q5b)
```


##H2f

```{r}
# =====================================================
# CLEAN DATA (REMOVE INVALID AND MISSING VALUES)
# =====================================================

library(dplyr)
library(ggplot2)

data_clean <- data_cluster_profile_5 %>%
  mutate(Q19 = as.numeric(Q19)) %>%   # ensure numeric
  filter(Q19 >= 1)                    # remove invalid values (<1) and NA

# =====================================================
# DESCRIPTIVE STATISTICS BY CLUSTER
# =====================================================

cluster_summary_Q19 <- data_clean %>%
  group_by(cluster) %>%
  summarise(
    n = n(),
    mean = mean(Q19, na.rm = TRUE),
    median = median(Q19, na.rm = TRUE),
    sd = sd(Q19, na.rm = TRUE),
    min = min(Q19, na.rm = TRUE),
    max = max(Q19, na.rm = TRUE)
  )

print(cluster_summary_Q19)

# =====================================================
# KRUSKAL-WALLIS TEST
# =====================================================

kruskal_test_Q19 <- kruskal.test(Q19 ~ cluster, data = data_clean)

print(kruskal_test_Q19)

# =====================================================
# PAIRWISE WILCOXON TEST
# =====================================================

pairwise_results_Q19 <- pairwise.wilcox.test(
  data_clean$Q19,
  data_clean$cluster,
  p.adjust.method = "bonferroni"
)

print(pairwise_results_Q19)

# =====================================================
# VISUALIZATION
# =====================================================

ggplot(data_clean, aes(x = cluster, y = Q19)) +
  geom_boxplot() +
  labs(
    title = "Willingness to Pay for AI Banking Assistant by Cluster",
    x = "Cluster",
    y = "Monthly Willingness to Pay (€)"
  ) +
  theme_minimal()
```


```{r}
# =====================================================
# ASSUMPTION CHECKS – H2f
# =====================================================

shapiro.test(data_clean$Q19)

ggplot(data_clean, aes(x = Q19)) +
  geom_histogram(binwidth = 1) +
  theme_minimal()

qqnorm(data_clean$Q19)
qqline(data_clean$Q19)

leveneTest(Q19 ~ cluster, data = data_clean)

# =====================================================
# KRUSKAL-WALLIS TEST
# =====================================================

kruskal.test(Q19 ~ cluster, data = data_clean)
```



```{r}
df <- data_cluster_profile_5
```

```{r}
# =====================================================
# KRUSKAL-WALLIS TEST
# =====================================================

kruskal_test_Q19 <- kruskal.test(Q19 ~ cluster, data = data_clean)
print(kruskal_test_Q19)

# =====================================================
# EFFECT SIZE
# =====================================================

library(rstatix)

effect_size_Q19 <- data_clean %>%
  kruskal_effsize(Q19 ~ cluster)

print(effect_size_Q19)
```
```{r}
library(dplyr)
library(rstatix)
library(coin)
library(purrr)

data_clean <- data_cluster_profile_5 %>%
  mutate(
    cluster = as.factor(cluster),
    Q19 = as.numeric(as.character(Q19))
  ) %>%
  filter(!is.na(cluster), !is.na(Q19), Q19 >= 1)

cluster_pairs <- combn(levels(data_clean$cluster), 2, simplify = FALSE)

pairwise_effects_Q19 <- map_dfr(cluster_pairs, function(x) {
  tmp <- data_clean %>%
    filter(cluster %in% x) %>%
    droplevels()

  wilcox_effsize(data = tmp, Q19 ~ cluster) %>%
    mutate(comparison = paste(x, collapse = " vs "))
})

print(pairwise_effects_Q19)
```


```{r}
library(dplyr)
df <- df |>
  mutate(
    across(c(Q10a, Q10b, Q10c, Q10d,
             Q11a, Q11b, Q11c, Q11d, Q11e, Q11f,
             Q17), as.numeric),

    low_risk_delegate  = rowMeans(pick(Q11a, Q11b, Q11f), na.rm = TRUE),
    high_risk_delegate = rowMeans(pick(Q11c, Q11d, Q11e), na.rm = TRUE),

    confirm_required   = Q10c,
    autonomous_decisions = Q10d,

    trust_ai = rowMeans(pick(Q10a, Q10b, Q10c, Q10d), na.rm = TRUE),
    intention_use = Q17
  )

df$cluster <- factor(df$cluster)
table(df$cluster)
```


# Min and max
```{r}
df |>
  summarise(
    h1a_low_min = min(low_risk_delegate, na.rm = TRUE),
    h1a_low_max = max(low_risk_delegate, na.rm = TRUE),
    h1a_high_min = min(high_risk_delegate, na.rm = TRUE),
    h1a_high_max = max(high_risk_delegate, na.rm = TRUE),

    h1b_confirm_min = min(confirm_required, na.rm = TRUE),
    h1b_confirm_max = max(confirm_required, na.rm = TRUE),
    h1b_auto_min = min(autonomous_decisions, na.rm = TRUE),
    h1b_auto_max = max(autonomous_decisions, na.rm = TRUE),

    h2a_trust_min = min(trust_ai, na.rm = TRUE),
    h2a_trust_max = max(trust_ai, na.rm = TRUE),

    h2c_intention_min = min(intention_use, na.rm = TRUE),
    h2c_intention_max = max(intention_use, na.rm = TRUE)
  )
```


## H1a
```{r}
h1a_results <- df |>
  group_by(cluster) |>
  do({
    sub <- .
    test <- t.test(sub$low_risk_delegate, sub$high_risk_delegate, paired = TRUE)

    tibble(
      n = nrow(sub),
      low_mean = mean(sub$low_risk_delegate, na.rm = TRUE),
      high_mean = mean(sub$high_risk_delegate, na.rm = TRUE),
      t_value = unname(test$statistic),
      p_value = test$p.value
    )
  })

h1a_results
```

```{r}
df <- df |>
  mutate(
    h1a_diff = low_risk_delegate - high_risk_delegate
  )
```

# Normality
```{r}
by(df$h1a_diff, df$cluster, shapiro.test)
```


# Wilcoxon signed-rank
```{r}
h1a_wilcox_results <- df |>
  group_by(cluster) |>
  do({
    sub <- .
    test <- wilcox.test(sub$low_risk_delegate, sub$high_risk_delegate, paired = TRUE)

    tibble(
      n = nrow(sub),
      low_mean = mean(sub$low_risk_delegate, na.rm = TRUE),
      high_mean = mean(sub$high_risk_delegate, na.rm = TRUE),
      p_value = test$p.value
    )
  })

h1a_wilcox_results
```

```{r}
h1a_final_results <- df |>
  group_by(cluster) |>
  do({
    sub <- .
    
    t_res <- t.test(sub$low_risk_delegate, sub$high_risk_delegate, paired = TRUE)
    w_res <- wilcox.test(sub$low_risk_delegate, sub$high_risk_delegate, paired = TRUE)
    
    diff <- sub$low_risk_delegate - sub$high_risk_delegate
    diff <- diff[!is.na(diff)]
    
    dz <- if (sd(diff) == 0) NA_real_ else mean(diff) / sd(diff)
    
    diff_nz <- diff[diff != 0]
    if (length(diff_nz) == 0) {
      rbc <- NA_real_
    } else {
      ranks <- rank(abs(diff_nz))
      W_pos <- sum(ranks[diff_nz > 0])
      W_neg <- sum(ranks[diff_nz < 0])
      rbc <- (W_pos - W_neg) / (W_pos + W_neg)
    }

    tibble(
      n = length(diff),
      low_mean = mean(sub$low_risk_delegate, na.rm = TRUE),
      high_mean = mean(sub$high_risk_delegate, na.rm = TRUE),
      mean_diff = mean(diff),
      t_value = unname(t_res$statistic),
      t_p_value = t_res$p.value,
      wilcox_p_value = w_res$p.value,
      cohen_dz = dz,
      rank_biserial = rbc
    )
  })

h1a_final_results
```


## H1b
```{r}
h1b_results <- df |>
  group_by(cluster) |>
  do({
    sub <- .
    test <- t.test(sub$confirm_required, sub$autonomous_decisions, paired = TRUE)

    tibble(
      n = nrow(sub),
      confirm_mean = mean(sub$confirm_required, na.rm = TRUE),
      autonomous_mean = mean(sub$autonomous_decisions, na.rm = TRUE),
      t_value = unname(test$statistic),
      p_value = test$p.value
    )
  })

h1b_results
```

```{r}
df <- df |>
  mutate(
    h1b_diff = confirm_required - autonomous_decisions
  )
```


# Normality by cluster
```{r}
by(df$h1b_diff, df$cluster, shapiro.test)
```

# Wilcoxon signed-rank
```{r}
h1b_wilcox_results <- df |>
  group_by(cluster) |>
  do({
    sub <- .
    test <- wilcox.test(
      sub$confirm_required,
      sub$autonomous_decisions,
      paired = TRUE,
      exact = FALSE
    )

    tibble(
      n = nrow(sub),
      confirm_mean = mean(sub$confirm_required, na.rm = TRUE),
      autonomous_mean = mean(sub$autonomous_decisions, na.rm = TRUE),
      p_value = test$p.value
    )
  })

h1b_wilcox_results
```

```{r}
h1b_final_results <- df |>
  group_by(cluster) |>
  do({
    sub <- .
    
    t_res <- t.test(sub$confirm_required, sub$autonomous_decisions, paired = TRUE)
    w_res <- wilcox.test(
      sub$confirm_required,
      sub$autonomous_decisions,
      paired = TRUE,
      exact = FALSE
    )
    
    diff <- sub$confirm_required - sub$autonomous_decisions
    diff <- diff[!is.na(diff)]
    
    dz <- if (sd(diff) == 0) NA_real_ else mean(diff) / sd(diff)
    
    diff_nz <- diff[diff != 0]
    if (length(diff_nz) == 0) {
      rbc <- NA_real_
    } else {
      ranks <- rank(abs(diff_nz))
      W_pos <- sum(ranks[diff_nz > 0])
      W_neg <- sum(ranks[diff_nz < 0])
      rbc <- (W_pos - W_neg) / (W_pos + W_neg)
    }

    tibble(
      n = length(diff),
      confirm_mean = mean(sub$confirm_required, na.rm = TRUE),
      autonomous_mean = mean(sub$autonomous_decisions, na.rm = TRUE),
      mean_diff = mean(diff),
      t_value = unname(t_res$statistic),
      t_p_value = t_res$p.value,
      wilcox_p_value = w_res$p.value,
      cohen_dz = dz,
      rank_biserial = rbc
    )
  })

h1b_final_results
```


```{r}
library(dplyr)

# make sure variables are in the right format
df$cluster <- as.factor(df$cluster)
df$trust_ai <- as.numeric(df$trust_ai)

## H2a
h2a_model <- aov(trust_ai ~ cluster, data = df)
summary(h2a_model)

# Post-hoc option 1: Tukey
TukeyHSD(h2a_model)

# Post-hoc option 2: pairwise t-tests with Bonferroni
pairwise.t.test(
  x = df$trust_ai,
  g = df$cluster,
  p.adjust.method = "bonferroni"
)

# Descriptive means
aggregate(trust_ai ~ cluster, data = df, mean, na.rm = TRUE)
```

```{r}
install.packages("effectsize")
library(effectsize)
```


```{r}
library(dplyr)
library(effectsize)

df$cluster <- as.factor(df$cluster)
df$trust_ai <- as.numeric(df$trust_ai)

## H2a
h2a_model <- aov(trust_ai ~ cluster, data = df)
summary(h2a_model)

TukeyHSD(h2a_model)

aggregate(trust_ai ~ cluster, data = df, mean, na.rm = TRUE)

# Effect sizes
eta_squared(h2a_model)
omega_squared(h2a_model)
```
```{r}
h2a_eta <- eta_squared(h2a_model)
print(h2a_eta)

h2a_omega <- omega_squared(h2a_model)
print(h2a_omega)
```


## H2c
```{r}
h2c_results <- lapply(levels(df$cluster), function(cl) {
  sub <- df |>
    filter(cluster == cl)

  model <- lm(intention_use ~ trust_ai, data = sub)
  coefs <- summary(model)$coefficients

  tibble(
  cluster = cl,
  b_trust = coefs["trust_ai", "Estimate"],
  p_value = coefs["trust_ai", "Pr(>|t|)"],
  r_squared = summary(model)$r.squared
)
}) |>
  bind_rows()

h2c_results
```

# Normality of regression residuals by cluster

```{r}
for(cl in levels(df$cluster)) {
  sub <- df |>
    filter(cluster == cl)

  model <- lm(intention_use ~ trust_ai, data = sub)

  cat("\n====================================\n")
  cat("CLUSTER:", cl, "\n")
  cat("====================================\n")
  print(shapiro.test(residuals(model)))
}
```

## Spearman test
```{r}
h2c_spearman <- lapply(levels(df$cluster), function(cl) {
  sub <- df |>
    filter(cluster == cl)

  test <- cor.test(sub$trust_ai, sub$intention_use, method = "spearman")

  tibble(
    cluster = cl,
    rho = unname(test$estimate),
    p_value = test$p.value
  )
}) |>
  bind_rows()

h2c_spearman
```

```{r}
h2c_results <- lapply(levels(df$cluster), function(cl) {
  sub <- df |>
    filter(cluster == cl)

  model <- lm(intention_use ~ trust_ai, data = sub)
  coefs <- summary(model)$coefficients

  tibble(
    cluster = cl,
    b_trust = coefs["trust_ai", "Estimate"],
    p_value = coefs["trust_ai", "Pr(>|t|)"],
    r_squared = summary(model)$r.squared,
    adj_r_squared = summary(model)$adj.r.squared
  )
}) |>
  bind_rows()

h2c_results
```




```{r}
library(dplyr)
library(tidyr)
library(purrr)
library(tibble)

data_cluster_profile_5 <- data_cluster_profile_5 |>
  mutate(
    cluster_named = factor(
      cluster,
      levels = c(1, 2, 3, 4, 5),
      labels = c(
        "Skeptical support seekers",
        "Cautious guidance seekers",
        "Feature-oriented adopters",
        "AI-resistant independents",
        "AI-enthusiastic guidance seekers"
      )
    )
  )
```

```{r}
bank_labels <- c(
  a = "OTP",
  b = "Gorenjska Banka",
  c = "NLB",
  d = "Revolut",
  e = "N26",
  f = "Intesa SanPaolo",
  g = "UniCredit"
)

run_bank_pairwise_tests <- function(data, cluster_name) {
  
  subset_data <- data |>
    filter(cluster_named == cluster_name) |>
    mutate(across(Q13a:Q15g, as.numeric))
  
  compare_dimension <- function(df, vars, dimension_name) {
    
    pairs <- combn(vars, 2, simplify = FALSE)
    
    results <- lapply(pairs, function(pair) {
      v1 <- pair[1]
      v2 <- pair[2]
      
      x <- df[[v1]]
      y <- df[[v2]]
      
      complete_idx <- complete.cases(x, y)
      x <- x[complete_idx]
      y <- y[complete_idx]
      
      test <- wilcox.test(x, y, paired = TRUE, exact = FALSE)
      
      tibble(
        cluster = cluster_name,
        dimension = dimension_name,
        bank_1 = bank_labels[substr(v1, nchar(v1), nchar(v1))],
        bank_2 = bank_labels[substr(v2, nchar(v2), nchar(v2))],
        n = length(x),
        mean_bank_1 = mean(x, na.rm = TRUE),
        mean_bank_2 = mean(y, na.rm = TRUE),
        p_value = test$p.value
      )
    })
    
    bind_rows(results) |>
      mutate(
        p_adjusted = p.adjust(p_value, method = "bonferroni"),
        significant = ifelse(p_adjusted < 0.05, "Yes", "No")
      ) |>
      arrange(p_adjusted)
  }
  
  innovation_results <- compare_dimension(
    subset_data,
    vars = c("Q13a", "Q13b", "Q13c", "Q13d", "Q13e", "Q13f", "Q13g"),
    dimension_name = "Innovation"
  )
  
  support_results <- compare_dimension(
    subset_data,
    vars = c("Q14a", "Q14b", "Q14c", "Q14d", "Q14e", "Q14f", "Q14g"),
    dimension_name = "Customer support"
  )
  
  reliability_results <- compare_dimension(
    subset_data,
    vars = c("Q15a", "Q15b", "Q15c", "Q15d", "Q15e", "Q15f", "Q15g"),
    dimension_name = "Reliability"
  )
  
  bind_rows(
    innovation_results,
    support_results,
    reliability_results
  )
}
```

```{r}
all_cluster_bank_tests <- bind_rows(
  run_bank_pairwise_tests(data_cluster_profile_5, "Skeptical support seekers"),
  run_bank_pairwise_tests(data_cluster_profile_5, "Cautious guidance seekers"),
  run_bank_pairwise_tests(data_cluster_profile_5, "Feature-oriented adopters"),
  run_bank_pairwise_tests(data_cluster_profile_5, "AI-resistant independents"),
  run_bank_pairwise_tests(data_cluster_profile_5, "AI-enthusiastic guidance seekers")
)

all_cluster_bank_tests
```

```{r}
all_cluster_bank_tests_sig <- all_cluster_bank_tests |>
  filter(p_adjusted < 0.05)

all_cluster_bank_tests_sig
```

```{r}
all_cluster_bank_tests_sig <- all_cluster_bank_tests_sig |>
  arrange(cluster, dimension, p_adjusted)

all_cluster_bank_tests_sig
```

```{r}
all_cluster_bank_tests_sig |>
  count(cluster, dimension)
```

```{r}
write.csv(
  all_cluster_bank_tests,
  "all_cluster_bank_pairwise_tests.csv",
  row.names = FALSE
)

write.csv(
  all_cluster_bank_tests_sig,
  "significant_cluster_bank_pairwise_tests.csv",
  row.names = FALSE
)
```

```{r}
# Recreate readable output tables from all_cluster_bank_tests

interpretable_results <- all_cluster_bank_tests |>
  mutate(
    mean_bank_1 = round(mean_bank_1, 2),
    mean_bank_2 = round(mean_bank_2, 2),
    mean_difference = round(mean_bank_1 - mean_bank_2, 2),
    higher_rated_bank = case_when(
      mean_bank_1 > mean_bank_2 ~ bank_1,
      mean_bank_2 > mean_bank_1 ~ bank_2,
      TRUE ~ "Equal"
    ),
    interpretation = case_when(
      p_adjusted < 0.05 & mean_bank_1 > mean_bank_2 ~
        paste0(bank_1, " is rated significantly higher than ", bank_2),
      p_adjusted < 0.05 & mean_bank_2 > mean_bank_1 ~
        paste0(bank_2, " is rated significantly higher than ", bank_1),
      TRUE ~ "No significant difference"
    ),
    p_value = round(p_value, 4),
    p_adjusted = round(p_adjusted, 4)
  ) |>
  arrange(cluster, dimension, p_adjusted)

significant_results_clean <- interpretable_results |>
  filter(p_adjusted < 0.05) |>
  select(
    cluster,
    dimension,
    bank_1,
    bank_2,
    mean_bank_1,
    mean_bank_2,
    mean_difference,
    higher_rated_bank,
    p_value,
    p_adjusted,
    interpretation
  )

report_table <- significant_results_clean |>
  transmute(
    Cluster = cluster,
    Dimension = dimension,
    Comparison = paste(bank_1, "vs", bank_2),
    `Mean bank 1` = mean_bank_1,
    `Mean bank 2` = mean_bank_2,
    `Mean difference` = mean_difference,
    `Higher-rated bank` = higher_rated_bank,
    `Raw p-value` = p_value,
    `Adjusted p-value` = p_adjusted,
    Interpretation = interpretation
  )

# Show outputs
interpretable_results
significant_results_clean
report_table
```

```{r}
all_cluster_bank_tests |>
  mutate(
    mean_bank_1 = round(mean_bank_1, 2),
    mean_bank_2 = round(mean_bank_2, 2),
    p_adjusted = round(p_adjusted, 4),
    result = case_when(
      p_adjusted < 0.05 & mean_bank_1 > mean_bank_2 ~ paste(bank_1, ">", bank_2),
      p_adjusted < 0.05 & mean_bank_2 > mean_bank_1 ~ paste(bank_2, ">", bank_1),
      TRUE ~ "No significant difference"
    )
  ) |>
  filter(p_adjusted < 0.05) |>
  select(cluster, dimension, bank_1, bank_2, mean_bank_1, mean_bank_2, p_adjusted, result) |>
  arrange(cluster, dimension, p_adjusted)
```

```{r}
library(dplyr)

q19_cluster_summary <- data_cluster_profile_5 |>
  mutate(
    cluster = factor(
      cluster,
      levels = c(1, 2, 3, 4, 5),
      labels = c(
        "Skeptical support seekers",
        "Cautious guidance seekers",
        "Feature-oriented adopters",
        "AI-resistant independents",
        "AI-enthusiastic guidance seekers"
      )
    ),
    Q19 = as.numeric(Q19)
  ) |>
  filter(!is.na(Q19), Q19 >= 1) |>
  group_by(cluster) |>
  summarise(
    n = n(),
    mean_q19 = mean(Q19, na.rm = TRUE),
    median_q19 = median(Q19, na.rm = TRUE),
    sd_q19 = sd(Q19, na.rm = TRUE),
    min_q19 = min(Q19, na.rm = TRUE),
    max_q19 = max(Q19, na.rm = TRUE),
    .groups = "drop"
  ) |>
  mutate(
    mean_q19 = round(mean_q19, 2),
    median_q19 = round(median_q19, 2),
    sd_q19 = round(sd_q19, 2)
  ) |>
  arrange(desc(mean_q19))

q19_cluster_summary
```

```{r}
kruskal.test(Q19 ~ cluster, data = data_cluster_profile_5 |>
  mutate(
    cluster = factor(
      cluster,
      levels = c(1, 2, 3, 4, 5),
      labels = c(
        "Skeptical support seekers",
        "Cautious guidance seekers",
        "Feature-oriented adopters",
        "AI-resistant independents",
        "AI-enthusiastic guidance seekers"
      )
    ),
    Q19 = as.numeric(Q19)
  ) |>
  filter(!is.na(Q19), Q19 >= 1)
)
```

```{r}
library(dplyr)

nlb_revolut_n26_overlap <- data_cluster_profile_5 |>
  mutate(
    cluster = factor(
      cluster,
      levels = c(1, 2, 3, 4, 5),
      labels = c(
        "Skeptical support seekers",
        "Cautious guidance seekers",
        "Feature-oriented adopters",
        "AI-resistant independents",
        "AI-enthusiastic guidance seekers"
      )
    ),
    Q25c = as.numeric(Q25c),  # NLB
    Q25d = as.numeric(Q25d),  # Revolut
    Q25e = as.numeric(Q25e)   # N26
  ) |>
  group_by(cluster) |>
  summarise(
    cluster_n = n(),
    n_nlb_revolut_n26 = sum(Q25c == 1 & Q25d == 1 & Q25e == 1, na.rm = TRUE),
    percent_nlb_revolut_n26 = round(100 * n_nlb_revolut_n26 / cluster_n, 1),
    .groups = "drop"
  )

nlb_revolut_n26_overlap
```

```{r}
library(dplyr)

nlb_revolut_n26_combinations <- data_cluster_profile_5 |>
  mutate(
    cluster = factor(
      cluster,
      levels = c(1, 2, 3, 4, 5),
      labels = c(
        "Skeptical support seekers",
        "Cautious guidance seekers",
        "Feature-oriented adopters",
        "AI-resistant independents",
        "AI-enthusiastic guidance seekers"
      )
    ),
    Q25c = as.numeric(Q25c),  # NLB
    Q25d = as.numeric(Q25d),  # Revolut
    Q25e = as.numeric(Q25e)   # N26
  ) |>
  mutate(
    bank_combo = case_when(
      Q25c == 1 & Q25d == 1 & Q25e == 1 ~ "NLB + Revolut + N26",
      Q25c == 1 & Q25d == 1 & (is.na(Q25e) | Q25e != 1) ~ "NLB + Revolut",
      Q25c == 1 & Q25e == 1 & (is.na(Q25d) | Q25d != 1) ~ "NLB + N26",
      Q25d == 1 & Q25e == 1 & (is.na(Q25c) | Q25c != 1) ~ "Revolut + N26",
      Q25c == 1 & (is.na(Q25d) | Q25d != 1) & (is.na(Q25e) | Q25e != 1) ~ "NLB only",
      Q25d == 1 & (is.na(Q25c) | Q25c != 1) & (is.na(Q25e) | Q25e != 1) ~ "Revolut only",
      Q25e == 1 & (is.na(Q25c) | Q25c != 1) & (is.na(Q25d) | Q25d != 1) ~ "N26 only",
      TRUE ~ "None of these three"
    )
  ) |>
  group_by(cluster, bank_combo) |>
  summarise(n = n(), .groups = "drop_last") |>
  mutate(percent = round(100 * n / sum(n), 1)) |>
  ungroup()

nlb_revolut_n26_combinations
```

```{r}
library(dplyr)
library(tibble)
library(FactoMineR)
library(factoextra)
library(ggplot2)

cluster2_bank_means <- data_cluster_profile_5 |>
  filter(cluster == 2) |>
  mutate(
    across(Q13a:Q15g, as.numeric)
  ) |>
  summarise(
    OTP_innovation = mean(Q13a, na.rm = TRUE),
    Gorenjska_innovation = mean(Q13b, na.rm = TRUE),
    NLB_innovation = mean(Q13c, na.rm = TRUE),
    Revolut_innovation = mean(Q13d, na.rm = TRUE),
    N26_innovation = mean(Q13e, na.rm = TRUE),
    Intesa_innovation = mean(Q13f, na.rm = TRUE),
    UniCredit_innovation = mean(Q13g, na.rm = TRUE),

    OTP_support = mean(Q14a, na.rm = TRUE),
    Gorenjska_support = mean(Q14b, na.rm = TRUE),
    NLB_support = mean(Q14c, na.rm = TRUE),
    Revolut_support = mean(Q14d, na.rm = TRUE),
    N26_support = mean(Q14e, na.rm = TRUE),
    Intesa_support = mean(Q14f, na.rm = TRUE),
    UniCredit_support = mean(Q14g, na.rm = TRUE),

    OTP_reliability = mean(Q15a, na.rm = TRUE),
    Gorenjska_reliability = mean(Q15b, na.rm = TRUE),
    NLB_reliability = mean(Q15c, na.rm = TRUE),
    Revolut_reliability = mean(Q15d, na.rm = TRUE),
    N26_reliability = mean(Q15e, na.rm = TRUE),
    Intesa_reliability = mean(Q15f, na.rm = TRUE),
    UniCredit_reliability = mean(Q15g, na.rm = TRUE)
  )

cluster2_bank_means
```

```{r}
cluster2_bank_table <- tibble(
  bank = c("OTP", "Gorenjska Banka", "NLB", "Revolut", "N26", "Intesa SanPaolo", "UniCredit"),
  innovation = c(
    mean(data_cluster_profile_5 |> filter(cluster == 2) |> pull(Q13a), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 2) |> pull(Q13b), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 2) |> pull(Q13c), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 2) |> pull(Q13d), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 2) |> pull(Q13e), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 2) |> pull(Q13f), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 2) |> pull(Q13g), na.rm = TRUE)
  ),
  customer_support = c(
    mean(data_cluster_profile_5 |> filter(cluster == 2) |> pull(Q14a), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 2) |> pull(Q14b), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 2) |> pull(Q14c), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 2) |> pull(Q14d), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 2) |> pull(Q14e), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 2) |> pull(Q14f), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 2) |> pull(Q14g), na.rm = TRUE)
  ),
  reliability = c(
    mean(data_cluster_profile_5 |> filter(cluster == 2) |> pull(Q15a), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 2) |> pull(Q15b), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 2) |> pull(Q15c), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 2) |> pull(Q15d), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 2) |> pull(Q15e), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 2) |> pull(Q15f), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 2) |> pull(Q15g), na.rm = TRUE)
  )
)

cluster2_bank_table
```

```{r}
cluster2_mat <- cluster2_bank_table |>
  column_to_rownames("bank") |>
  as.matrix()

pca_cluster2 <- FactoMineR::PCA(cluster2_mat, scale.unit = TRUE, graph = FALSE)
```

```{r}
cluster2_coordinates <- as.data.frame(pca_cluster2$ind$coord)
cluster2_coordinates$bank <- rownames(cluster2_coordinates)
rownames(cluster2_coordinates) <- NULL

cluster2_coordinates
```

```{r}
cluster2_loadings <- as.data.frame(pca_cluster2$var$coord)
cluster2_loadings$dimension <- rownames(cluster2_loadings)
rownames(cluster2_loadings) <- NULL

cluster2_loadings
```

```{r}
cluster2_nlb_explanation <- cluster2_bank_table |>
  filter(bank == "NLB") |>
  mutate(
    Dim1_loading_innovation = pca_cluster2$var$coord["innovation", "Dim.1"],
    Dim1_loading_support = pca_cluster2$var$coord["customer_support", "Dim.1"],
    Dim1_loading_reliability = pca_cluster2$var$coord["reliability", "Dim.1"],
    Dim2_loading_innovation = pca_cluster2$var$coord["innovation", "Dim.2"],
    Dim2_loading_support = pca_cluster2$var$coord["customer_support", "Dim.2"],
    Dim2_loading_reliability = pca_cluster2$var$coord["reliability", "Dim.2"],
    NLB_Dim1 = pca_cluster2$ind$coord["NLB", "Dim.1"],
    NLB_Dim2 = pca_cluster2$ind$coord["NLB", "Dim.2"]
  )

cluster2_nlb_explanation
```

```{r}
factoextra::fviz_pca_biplot(
  pca_cluster2,
  repel = TRUE,
  col.var = "gray30",
  col.ind = "steelblue",
  pointsize = 3
) +
  ggplot2::ggtitle("Perception Map of Banks - Cluster 2") +
  ggplot2::xlab("Dim 1") +
  ggplot2::ylab("Dim 2") +
  ggplot2::theme_minimal()
```

```{r}
cluster2_bank_table
```

```{r}
cluster2_coordinates
```

```{r}
cluster2_loadings
```

```{r}
library(dplyr)
library(tibble)
library(FactoMineR)
library(factoextra)
library(ggplot2)

# --------------------------------------------
# 1) Bank mean table for cluster 3
# --------------------------------------------
cluster3_bank_table <- tibble(
  bank = c("OTP", "Gorenjska Banka", "NLB", "Revolut", "N26", "Intesa SanPaolo", "UniCredit"),
  innovation = c(
    mean(data_cluster_profile_5 |> filter(cluster == 3) |> pull(Q13a), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 3) |> pull(Q13b), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 3) |> pull(Q13c), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 3) |> pull(Q13d), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 3) |> pull(Q13e), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 3) |> pull(Q13f), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 3) |> pull(Q13g), na.rm = TRUE)
  ),
  customer_support = c(
    mean(data_cluster_profile_5 |> filter(cluster == 3) |> pull(Q14a), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 3) |> pull(Q14b), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 3) |> pull(Q14c), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 3) |> pull(Q14d), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 3) |> pull(Q14e), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 3) |> pull(Q14f), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 3) |> pull(Q14g), na.rm = TRUE)
  ),
  reliability = c(
    mean(data_cluster_profile_5 |> filter(cluster == 3) |> pull(Q15a), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 3) |> pull(Q15b), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 3) |> pull(Q15c), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 3) |> pull(Q15d), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 3) |> pull(Q15e), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 3) |> pull(Q15f), na.rm = TRUE),
    mean(data_cluster_profile_5 |> filter(cluster == 3) |> pull(Q15g), na.rm = TRUE)
  )
)

cluster3_bank_table
```

```{r}
# --------------------------------------------
# 2) PCA for cluster 3
# --------------------------------------------
cluster3_mat <- cluster3_bank_table |>
  column_to_rownames("bank") |>
  as.matrix()

pca_cluster3 <- FactoMineR::PCA(cluster3_mat, scale.unit = TRUE, graph = FALSE)
```

```{r}
# --------------------------------------------
# 3) Bank coordinates
# --------------------------------------------
cluster3_coordinates <- as.data.frame(pca_cluster3$ind$coord)
cluster3_coordinates$bank <- rownames(cluster3_coordinates)
rownames(cluster3_coordinates) <- NULL

cluster3_coordinates
```

```{r}
# --------------------------------------------
# 4) Variable loadings
# --------------------------------------------
cluster3_loadings <- as.data.frame(pca_cluster3$var$coord)
cluster3_loadings$dimension <- rownames(cluster3_loadings)
rownames(cluster3_loadings) <- NULL

cluster3_loadings
```

```{r}
# --------------------------------------------
# 5) NLB explanation table
# --------------------------------------------
cluster3_nlb_explanation <- cluster3_bank_table |>
  filter(bank == "NLB") |>
  mutate(
    Dim1_loading_innovation = pca_cluster3$var$coord["innovation", "Dim.1"],
    Dim1_loading_support = pca_cluster3$var$coord["customer_support", "Dim.1"],
    Dim1_loading_reliability = pca_cluster3$var$coord["reliability", "Dim.1"],
    Dim2_loading_innovation = pca_cluster3$var$coord["innovation", "Dim.2"],
    Dim2_loading_support = pca_cluster3$var$coord["customer_support", "Dim.2"],
    Dim2_loading_reliability = pca_cluster3$var$coord["reliability", "Dim.2"],
    NLB_Dim1 = pca_cluster3$ind$coord["NLB", "Dim.1"],
    NLB_Dim2 = pca_cluster3$ind$coord["NLB", "Dim.2"]
  )

cluster3_nlb_explanation
```

```{r}
# --------------------------------------------
# 6) Plot
# --------------------------------------------
factoextra::fviz_pca_biplot(
  pca_cluster3,
  repel = TRUE,
  col.var = "gray30",
  col.ind = "steelblue",
  pointsize = 3
) +
  ggplot2::ggtitle("Perception Map of Banks - Cluster 3") +
  ggplot2::xlab("Dim 1") +
  ggplot2::ylab("Dim 2") +
  ggplot2::theme_minimal()
```

```{r}
# --------------------------------------------
# 7) Compare NLB with Revolut and N26
# --------------------------------------------
cluster3_bank_table |>
  filter(bank %in% c("NLB", "Revolut", "N26"))
```

```{r}
cluster3_bank_table
```

```{r}
library(dplyr)
library(tidyr)
library(purrr)

# -----------------------------
# 1) Q12 item labels
# -----------------------------
q12_labels <- c(
  Q12a = "Security",
  Q12b = "Personal data protection",
  Q12c = "Trust in the bank",
  Q12d = "Ease of use",
  Q12e = "Transaction execution speed",
  Q12f = "Variety of functions",
  Q12g = "Availability of human support",
  Q12h = "Personalized financial insights",
  Q12i = "Understanding how the program makes decisions"
)

q12_vars <- names(q12_labels)

# -----------------------------
# 2) Attach the 5-cluster solution
# -----------------------------
cluster_labels <- c(
  "Skeptical support seekers",
  "Cautious guidance seekers",
  "Feature-oriented adopters",
  "AI-resistant independents",
  "AI-enthusiastic guidance seekers"
)

data_cluster_profile_5 <- data_clean_complete %>%
  mutate(
    cluster = factor(
      k5_pca2$cluster,
      levels = 1:5,
      labels = cluster_labels
    )
  )

# -----------------------------
# 3) Function to profile ONE cluster independently
# -----------------------------
profile_one_cluster_q12 <- function(data, cluster_name) {
  
  data %>%
    filter(cluster == cluster_name) %>%
    select(all_of(q12_vars)) %>%
    mutate(across(everything(), as.numeric)) %>%
    pivot_longer(
      cols = everything(),
      names_to = "item",
      values_to = "score"
    ) %>%
    group_by(item) %>%
    summarise(
      n = sum(!is.na(score)),
      mean = round(mean(score, na.rm = TRUE), 2),
      sd = round(sd(score, na.rm = TRUE), 2),
      median = round(median(score, na.rm = TRUE), 2),
      pct_6_7 = round(mean(score %in% c(6, 7), na.rm = TRUE) * 100, 1),
      pct_7 = round(mean(score == 7, na.rm = TRUE) * 100, 1),
      .groups = "drop"
    ) %>%
    mutate(
      label = q12_labels[item],
      cluster = cluster_name
    ) %>%
    select(cluster, item, label, n, mean, sd, median, pct_6_7, pct_7) %>%
    arrange(desc(mean))
}

# -----------------------------
# 4) Create a separate profile for each cluster
# -----------------------------
cluster_1_q12_profile <- profile_one_cluster_q12(
  data_cluster_profile_5,
  "Skeptical support seekers"
)

cluster_2_q12_profile <- profile_one_cluster_q12(
  data_cluster_profile_5,
  "Cautious guidance seekers"
)

cluster_3_q12_profile <- profile_one_cluster_q12(
  data_cluster_profile_5,
  "Feature-oriented adopters"
)

cluster_4_q12_profile <- profile_one_cluster_q12(
  data_cluster_profile_5,
  "AI-resistant independents"
)

cluster_5_q12_profile <- profile_one_cluster_q12(
  data_cluster_profile_5,
  "AI-enthusiastic guidance seekers"
)

# -----------------------------
# 5) View each cluster independently
# -----------------------------
cluster_1_q12_profile
cluster_2_q12_profile
cluster_3_q12_profile
cluster_4_q12_profile
cluster_5_q12_profile
```

```{r}
cluster_q12_profiles <- setNames(
  lapply(levels(data_cluster_profile_5$cluster), function(cl) {
    profile_one_cluster_q12(data_cluster_profile_5, cl)
  }),
  levels(data_cluster_profile_5$cluster)
)

# Example:
cluster_q12_profiles[["Skeptical support seekers"]]
cluster_q12_profiles[["AI-resistant independents"]]
```

```{r}
bank_data <- data_cluster_profile_5 |>
  mutate(across(Q25a:Q25l, as.numeric))

```


```{r}
bank_combinations <- bank_data |>
  mutate(

    # Revolut only
    revolut_only =
      Q25d == 1 &
      rowSums(across(Q25a:Q25c)) == 0 &
      rowSums(across(Q25e:Q25l)) == 0,

    # NLB + Revolut
    nlb_revolut =
      Q25c == 1 & Q25d == 1,

    # Revolut + any other bank except NLB
    revolut_other =
      Q25d == 1 &
      rowSums(across(c(Q25a, Q25b, Q25e:Q25l))) > 0,

    # Revolut + grouped "other banks" (all except NLB)
    revolut_group_other =
      Q25d == 1 &
      rowSums(across(c(Q25a, Q25b, Q25e:Q25l))) > 0
  )

```

```{r}
revolut_cluster_table <- bank_combinations |>
  group_by(cluster) |>
  summarise(

    n_cluster = n(),

    revolut_only = sum(revolut_only, na.rm = TRUE),
    nlb_revolut = sum(nlb_revolut, na.rm = TRUE),
    revolut_other = sum(revolut_other, na.rm = TRUE),
    revolut_group_other = sum(revolut_group_other, na.rm = TRUE),

    revolut_only_pct = round(100 * revolut_only / n_cluster, 1),
    nlb_revolut_pct = round(100 * nlb_revolut / n_cluster, 1),
    revolut_other_pct = round(100 * revolut_other / n_cluster, 1),
    revolut_group_other_pct = round(100 * revolut_group_other / n_cluster, 1)

  )

revolut_cluster_table

```

```{r}
library(tidyr)

revolut_cluster_table |>
  select(
    cluster,
    revolut_only_pct,
    nlb_revolut_pct,
    revolut_other_pct
  ) |>
  pivot_longer(
    cols = -cluster,
    names_to = "combination",
    values_to = "percent"
  )

```

```{r}
bank_data <- data_cluster_profile_5 |>
  mutate(across(Q25a:Q25l, as.numeric))

```

```{r}
bank_groups <- bank_data |>
  mutate(

    # Revolut only
    revolut_only =
      Q25d == 1 &
      rowSums(across(c(Q25a, Q25b, Q25c, Q25e:Q25l))) == 0,

    # NLB + Revolut
    nlb_revolut =
      Q25c == 1 & Q25d == 1,

    # OTP + Revolut
    otp_revolut =
      Q25a == 1 & Q25d == 1,

    # Revolut + any other bank except NLB and OTP
    revolut_other =
      Q25d == 1 &
      rowSums(across(c(Q25b, Q25e:Q25l))) > 0
  )

```

```{r}
revolut_cluster_summary <- bank_groups |>
  group_by(cluster) |>
  summarise(

    n_cluster = n(),

    revolut_only = sum(revolut_only, na.rm = TRUE),
    nlb_revolut = sum(nlb_revolut, na.rm = TRUE),
    otp_revolut = sum(otp_revolut, na.rm = TRUE),
    revolut_other = sum(revolut_other, na.rm = TRUE),

    revolut_only_pct = round(100 * revolut_only / n_cluster, 1),
    nlb_revolut_pct = round(100 * nlb_revolut / n_cluster, 1),
    otp_revolut_pct = round(100 * otp_revolut / n_cluster, 1),
    revolut_other_pct = round(100 * revolut_other / n_cluster, 1)

  )

revolut_cluster_summary

```

```{r}
library(tidyr)

revolut_cluster_summary |>
  select(
    cluster,
    revolut_only_pct,
    nlb_revolut_pct,
    otp_revolut_pct,
    revolut_other_pct
  ) |>
  pivot_longer(
    cols = -cluster,
    names_to = "group",
    values_to = "percent"
  )

```

```{r}
library(dplyr)

bank_segments <- data_cluster_profile_5 |>
  mutate(across(Q25a:Q25l, as.numeric)) |>
  mutate(

    segment = case_when(

      Q25c == 1 & Q25d == 0 & Q25a == 0 ~ "NLB only",
      Q25d == 1 & Q25c == 0 & Q25a == 0 ~ "Revolut only",
      Q25a == 1 & Q25c == 0 & Q25d == 0 ~ "OTP only",

      Q25c == 1 & Q25d == 1 & Q25a == 0 ~ "NLB + Revolut",
      Q25c == 1 & Q25a == 1 & Q25d == 0 ~ "NLB + OTP",
      Q25a == 1 & Q25d == 1 & Q25c == 0 ~ "OTP + Revolut",

      Q25a == 1 & Q25c == 1 & Q25d == 1 ~ "NLB + Revolut + OTP",

      TRUE ~ "None of these three"
    )
  )
```

```{r}
segment_table <- bank_segments |>
  group_by(cluster, segment) |>
  summarise(n = n(), .groups = "drop") |>
  group_by(cluster) |>
  mutate(
    percent = round(100 * n / sum(n), 1)
  ) |>
  arrange(cluster, desc(percent))

segment_table
```

```{r}
conversion_table <- data_cluster_profile_5 |>
  mutate(across(Q25a:Q25l, as.numeric)) |>
  group_by(cluster) |>
  summarise(

    cluster_size = n(),

    revolut_users = sum(Q25d == 1, na.rm = TRUE),
    nlb_users = sum(Q25c == 1, na.rm = TRUE),

    nlb_revolut_users = sum(Q25c == 1 & Q25d == 1, na.rm = TRUE),

    revolut_without_nlb = sum(Q25d == 1 & Q25c == 0, na.rm = TRUE),

    revolut_users_pct = round(100 * revolut_users / cluster_size, 1),

    revolut_without_nlb_pct =
      round(100 * revolut_without_nlb / cluster_size, 1)

  )

conversion_table
```



##Cluster 3
```{r}
library(readxl)
library(dplyr)
library(tidyr)
library(tibble)
library(ggplot2)

## 1. Load and clean data ----

raw_sheet <- read_excel(
  "Questionnaire_results_EN.xlsx",
  sheet = "Podatki",
  col_names = FALSE
)

var_names <- raw_sheet |>
  slice(1) |>
  unlist(use.names = FALSE) |>
  as.character()

question_text <- raw_sheet |>
  slice(2) |>
  unlist(use.names = FALSE) |>
  as.character()

data_raw <- raw_sheet |>
  slice(-(1:2))

names(data_raw) <- var_names

data_raw <- data_raw |>
  mutate(respondent_id = row_number()) |>
  relocate(respondent_id)

data_clean <- data_raw |>
  mutate(across(everything(),
                ~ replace(as.character(.), as.character(.) == "-1", NA))) |>
  filter(!is.na(Q22), !is.na(Q23))

data_clean <- data_clean |>
  mutate(
    across(
      Q13a:Q15g,
      ~ as.numeric(replace(., . == "8", NA))
    )
  )

## 2. Rebuild the 5 respondent clusters (same logic as before) ----

cluster_data <- data_clean |>
  select(Q6a, Q6b, Q6d, Q6e, Q6h, Q6i,
         Q8a, Q8b, Q8c, Q8d, Q8e) |>
  mutate(across(everything(), as.numeric))

cluster_data_complete <- cluster_data |>
  drop_na()

pca_cluster <- prcomp(cluster_data_complete, scale. = TRUE)
pca_scores_2 <- as.data.frame(pca_cluster$x[, 1:2])

set.seed(123)
k5_pca2 <- kmeans(pca_scores_2, centers = 5, nstart = 25)

data_clean_complete <- data_clean |>
  filter(
    !is.na(Q6a), !is.na(Q6b), !is.na(Q6d), !is.na(Q6e), !is.na(Q6h), !is.na(Q6i),
    !is.na(Q8a), !is.na(Q8b), !is.na(Q8c), !is.na(Q8d), !is.na(Q8e)
  )

data_cluster <- data_clean_complete |>
  mutate(
    cluster = factor(
      k5_pca2$cluster,
      levels = c(1, 2, 3, 4, 5),
      labels = c(
        "Skeptical support seekers",
        "Cautious guidance seekers",
        "Feature-oriented adopters",   # cluster 3
        "AI-resistant independents",
        "AI-enthusiastic guidance seekers"
      )
    )
  )

## 3. Hard-code banks and perception items (Q13–Q15) ----

# Q13: innovation, Q14: customer support, Q15: reliability
percept_vars <- c(
  "Q13a","Q13b","Q13c","Q13d","Q13e","Q13f","Q13g",
  "Q14a","Q14b","Q14c","Q14d","Q14e","Q14f","Q14g",
  "Q15a","Q15b","Q15c","Q15d","Q15e","Q15f","Q15g"
)

# explicit mapping from column suffix (a–g) to bank name
bank_lookup <- tibble(
  bank_code  = letters[1:7],
  bank_label = c("OTP",
                 "Gorenjska Banka",
                 "NLB",
                 "Revolut",
                 "N26",
                 "Intesa SanPaolo",
                 "UniCredit")
)

# helper table describing each Q13–15 variable
qmeta <- tibble(variable = percept_vars) %>%
  mutate(
    qcode     = substr(variable, 1, 3),     # Q13, Q14, Q15
    bank_code = substr(variable, 4, 4)      # a–g
  ) %>%
  left_join(bank_lookup, by = "bank_code") %>%
  mutate(
    attribute = case_when(
      qcode == "Q13" ~ "innovation",
      qcode == "Q14" ~ "customer_support",
      qcode == "Q15" ~ "reliability",
      TRUE ~ qcode
    )
  )

## 4. Build bank x attribute matrix for cluster 3 ----

cluster3 <- data_cluster %>%
  filter(cluster == "Feature-oriented adopters")

cluster3_percept <- cluster3 %>%
  select(all_of(percept_vars)) %>%
  mutate(across(everything(), as.numeric))

means_c3 <- cluster3_percept %>%
  summarise(across(everything(), ~ mean(.x, na.rm = TRUE)))

means_long <- means_c3 %>%
  pivot_longer(cols = everything(),
               names_to = "variable",
               values_to = "mean_score") %>%
  left_join(qmeta, by = "variable")

bank_attr_mat <- means_long %>%
  group_by(bank_label, attribute) %>%
  summarise(mean_score = mean(mean_score), .groups = "drop") %>%
  pivot_wider(
    id_cols = bank_label,
    names_from = attribute,
    values_from = mean_score
  ) %>%
  as.data.frame()

rownames(bank_attr_mat) <- bank_attr_mat$bank_label
bank_attr_mat$bank_label <- NULL

## 5. PCA for banks (cluster 3) ----

pca_banks_c3 <- prcomp(bank_attr_mat, scale. = TRUE)

scores_c3 <- as.data.frame(pca_banks_c3$x[, 1:2])
scores_c3$bank_label <- rownames(scores_c3)

loadings_c3 <- as.data.frame(pca_banks_c3$rotation[, 1:2])
loadings_c3$attribute <- rownames(loadings_c3)

arrow_scale <- 1.5
loadings_c3 <- loadings_c3 %>%
  mutate(PC1 = PC1 * arrow_scale,
         PC2 = PC2 * arrow_scale)

## 6. Plot: perceptual map of banks – cluster 3 ----

ggplot() +
  geom_point(data = scores_c3,
             aes(x = PC1, y = PC2),
             size = 2.8, colour = "black") +
  geom_text(data = scores_c3,
            aes(x = PC1, y = PC2, label = bank_label),
            vjust = -0.7, size = 3.2) +
  geom_segment(data = loadings_c3,
               aes(x = 0, y = 0, xend = PC1, yend = PC2),
               arrow = arrow(length = unit(0.2, "cm")),
               colour = "grey40") +
  geom_text(data = loadings_c3,
            aes(x = PC1, y = PC2, label = attribute),
            hjust = 0.5, vjust = -0.4, colour = "grey40", size = 3) +
  geom_hline(yintercept = 0, linetype = "dashed", colour = "grey75") +
  geom_vline(xintercept = 0, linetype = "dashed", colour = "grey75") +
  coord_equal(xlim = c(min(scores_c3$PC1) - 0.8, max(scores_c3$PC1) + 0.8),
              ylim = c(min(scores_c3$PC2) - 0.8, max(scores_c3$PC2) + 0.8),
              expand = TRUE) +
  labs(
    title = "Perceptual Map of Banks – Cluster 3",
    x = "Overall Digital Banking Performance",
    y = "Customer Support vs. Innovation"
  ) +
  theme_minimal(base_size = 12) +
  theme(
    plot.title = element_text(hjust = 0.5, face = "bold"),
    panel.grid.minor = element_blank()
  )

```
```{r}
bank_attr_mat
```

```{r}
# loadings for each attribute on PC1 and PC2
load_table <- as.data.frame(pca_banks_c3$rotation[, 1:2])
load_table$attribute <- rownames(load_table)
rownames(load_table) <- NULL

load_table
```

```{r}
# bank attribute means we already had:
bank_attr_mat   # rows = banks, cols = innovation, customer_support, reliability

# join with scores on PC2
bank_pc2 <- scores_c3 %>%
  select(bank_label, PC2) %>%
  left_join(
    bank_attr_mat %>%
      tibble::rownames_to_column("bank_label"),
    by = "bank_label"
  )

bank_pc2

```
```{r}
bank_pc2 <- scores_c3 %>%
  select(bank_label, PC2) %>%
  left_join(
    bank_attr_mat %>%
      tibble::rownames_to_column("bank_label"),
    by = "bank_label"
  )

bank_pc2
```

```{r}
# load_table: columns PC1, PC2, attribute (innovation, customer_support, reliability)
load_table

# 1) put PC2 loadings into a named vector
pc2_load <- load_table$PC2
names(pc2_load) <- load_table$attribute

# 2) compute contribution scores: attribute_mean * PC2 loading
contrib_pc2 <- bank_pc2 %>%
  mutate(
    contrib_customer_support = customer_support * pc2_load["customer_support"],
    contrib_innovation       = innovation       * pc2_load["innovation"],
    contrib_reliability      = reliability      * pc2_load["reliability"]
  )

contrib_pc2

```
```{r}
contrib_pc2_long <- contrib_pc2 %>%
  select(bank_label,
         contrib_customer_support,
         contrib_innovation,
         contrib_reliability) %>%
  tidyr::pivot_longer(
    cols = starts_with("contrib_"),
    names_to = "attribute",
    values_to = "contribution"
  ) %>%
  mutate(attribute = gsub("contrib_", "", attribute))

contrib_pc2_long

```


```{r}
ggplot(contrib_pc2_long,
       aes(x = attribute, y = contribution, fill = attribute)) +
  geom_col(show.legend = FALSE) +
  facet_wrap(~ bank_label) +
  theme_minimal() +
  labs(
    title = "Approximate attribute contributions to Dimension 2 (cluster 3)",
    x = "Attribute",
    y = "Contribution to Dim2"
  )
```
```{r}
load_table3 <- as.data.frame(pca_banks_c3$rotation[, 1:2])
load_table3$attribute <- rownames(load_table3)
rownames(load_table3) <- NULL

load_table3

```

## Cluster 5
```{r}
## Cluster 5: bank x attribute matrix ----

cluster5 <- data_cluster %>%
  filter(cluster == "AI-enthusiastic guidance seekers")   # cluster 5 label

cluster5_percept <- cluster5 %>%
  select(all_of(percept_vars)) %>%
  mutate(across(everything(), as.numeric))

means_c5 <- cluster5_percept %>%
  summarise(across(everything(), ~ mean(.x, na.rm = TRUE)))

means_c5_long <- means_c5 %>%
  pivot_longer(cols = everything(),
               names_to = "variable",
               values_to = "mean_score") %>%
  left_join(qmeta, by = "variable")

bank_attr_mat5 <- means_c5_long %>%
  group_by(bank_label, attribute) %>%
  summarise(mean_score = mean(mean_score), .groups = "drop") %>%
  pivot_wider(
    id_cols = bank_label,
    names_from = attribute,
    values_from = mean_score
  ) %>%
  as.data.frame()

rownames(bank_attr_mat5) <- bank_attr_mat5$bank_label
bank_attr_mat5$bank_label <- NULL

```

```{r}
## PCA for banks – cluster 5 ----

pca_banks_c5 <- prcomp(bank_attr_mat5, scale. = TRUE)

scores_c5 <- as.data.frame(pca_banks_c5$x[, 1:2])
scores_c5$bank_label <- rownames(scores_c5)

loadings_c5 <- as.data.frame(pca_banks_c5$rotation[, 1:2])
loadings_c5$attribute <- rownames(loadings_c5)

arrow_scale <- 1.5
loadings_c5 <- loadings_c5 %>%
  mutate(PC1 = PC1 * arrow_scale,
         PC2 = PC2 * arrow_scale)

## Plot: perceptual map for cluster 5 ----

ggplot() +
  geom_point(data = scores_c5,
             aes(x = PC1, y = PC2),
             size = 2.8, colour = "black") +
  geom_text(data = scores_c5,
            aes(x = PC1, y = PC2, label = bank_label),
            vjust = -0.7, size = 3.2) +
  geom_segment(data = loadings_c5,
               aes(x = 0, y = 0, xend = PC1, yend = PC2),
               arrow = arrow(length = unit(0.2, "cm")),
               colour = "grey40") +
  geom_text(data = loadings_c5,
            aes(x = PC1, y = PC2, label = attribute),
            hjust = 0.5, vjust = -0.4, colour = "grey40", size = 3) +
  geom_hline(yintercept = 0, linetype = "dashed", colour = "grey75") +
  geom_vline(xintercept = 0, linetype = "dashed", colour = "grey75") +
  coord_equal(xlim = c(min(scores_c5$PC1) - 0.8, max(scores_c5$PC1) + 0.8),
              ylim = c(min(scores_c5$PC2) - 0.8, max(scores_c5$PC2) + 0.8),
              expand = TRUE) +
  labs(
    title = "Perceptual Map of Banks – Cluster 5",
    x = "Overall Digital Banking Performance",
    y = "Customer Support vs. Relaibility"
  ) +
  theme_minimal(base_size = 12) +
  theme(
    plot.title = element_text(hjust = 0.5, face = "bold"),
    panel.grid.minor = element_blank()
  )

```
```{r}
## Loadings table for cluster 5 ----
load_table5 <- as.data.frame(pca_banks_c5$rotation[, 1:2])
load_table5$attribute <- rownames(load_table5)
rownames(load_table5) <- NULL

# PC2 loadings as named vector
pc2_load5 <- load_table5$PC2
names(pc2_load5) <- load_table5$attribute

# join PC2 scores with attribute means
bank_pc2_5 <- scores_c5 %>%
  select(bank_label, PC2) %>%
  left_join(
    bank_attr_mat5 %>% tibble::rownames_to_column("bank_label"),
    by = "bank_label"
  )

# contribution scores
contrib_pc2_5 <- bank_pc2_5 %>%
  mutate(
    contrib_customer_support = customer_support * pc2_load5["customer_support"],
    contrib_innovation       = innovation       * pc2_load5["innovation"],
    contrib_reliability      = reliability      * pc2_load5["reliability"]
  )

contrib_pc2_5

```

```{r}
contrib_pc2_5_long <- contrib_pc2_5 %>%
  select(bank_label,
         contrib_customer_support,
         contrib_innovation,
         contrib_reliability) %>%
  pivot_longer(
    cols = starts_with("contrib_"),
    names_to = "attribute",
    values_to = "contribution"
  ) %>%
  mutate(attribute = gsub("contrib_", "", attribute))

ggplot(contrib_pc2_5_long,
       aes(x = attribute, y = contribution, fill = attribute)) +
  geom_col(show.legend = FALSE) +
  facet_wrap(~ bank_label) +
  theme_minimal() +
  labs(
    title = "Approximate attribute contributions to Dimension 2 (cluster 5)",
    x = "Attribute",
    y = "Contribution to Dim2"
  )

```
```{r}
bank_pc2_5 <- scores_c5 %>%
  select(bank_label, PC2) %>%
  left_join(
    bank_attr_mat5 %>%
      tibble::rownames_to_column("bank_label"),
    by = "bank_label"
  )

bank_pc2_5

```

```{r}
# loadings for cluster 5 (PC1 and PC2)
load_table5 <- as.data.frame(pca_banks_c5$rotation[, 1:2])
load_table5$attribute <- rownames(load_table5)
rownames(load_table5) <- NULL

load_table5
```
```{r}
## loadings for cluster 5 already in load_table5
# pc2_load5: named vector of PC2 loadings
pc2_load5 <- load_table5$PC2
names(pc2_load5) <- load_table5$attribute

## bank_pc2_5 already created like this:
# bank_pc2_5 <- scores_c5 %>%
#   select(bank_label, PC2) %>%
#   left_join(
#     bank_attr_mat5 %>% tibble::rownames_to_column("bank_label"),
#     by = "bank_label"
#   )

contrib_pc2_5 <- bank_pc2_5 %>%
  mutate(
    contrib_customer_support = customer_support * pc2_load5["customer_support"],
    contrib_innovation       = innovation       * pc2_load5["innovation"],
    contrib_reliability      = reliability      * pc2_load5["reliability"]
  )

contrib_pc2_5

```

## Cluster 2
```{r}
## Cluster 2: bank x attribute matrix ----

cluster2 <- data_cluster %>%
  filter(cluster == "Cautious guidance seekers")   # cluster 2 label

cluster2_percept <- cluster2 %>%
  select(all_of(percept_vars)) %>%
  mutate(across(everything(), as.numeric))

means_c2 <- cluster2_percept %>%
  summarise(across(everything(), ~ mean(.x, na.rm = TRUE)))

means_c2_long <- means_c2 %>%
  pivot_longer(cols = everything(),
               names_to = "variable",
               values_to = "mean_score") %>%
  left_join(qmeta, by = "variable")

bank_attr_mat2 <- means_c2_long %>%
  group_by(bank_label, attribute) %>%
  summarise(mean_score = mean(mean_score), .groups = "drop") %>%
  pivot_wider(
    id_cols = bank_label,
    names_from = attribute,
    values_from = mean_score
  ) %>%
  as.data.frame()

rownames(bank_attr_mat2) <- bank_attr_mat2$bank_label
bank_attr_mat2$bank_label <- NULL

```

```{r}
## PCA for banks – cluster 2 ----

pca_banks_c2 <- prcomp(bank_attr_mat2, scale. = TRUE)

scores_c2 <- as.data.frame(pca_banks_c2$x[, 1:2])
scores_c2$bank_label <- rownames(scores_c2)

loadings_c2 <- as.data.frame(pca_banks_c2$rotation[, 1:2])
loadings_c2$attribute <- rownames(loadings_c2)

arrow_scale <- 1.5
loadings_c2 <- loadings_c2 %>%
  mutate(PC1 = PC1 * arrow_scale,
         PC2 = PC2 * arrow_scale)

## Plot: perceptual map for cluster 2 ----

ggplot() +
  geom_point(data = scores_c2,
             aes(x = PC1, y = PC2),
             size = 2.8, colour = "black") +
  geom_text(data = scores_c2,
            aes(x = PC1, y = PC2, label = bank_label),
            vjust = -0.7, size = 3.2) +
  geom_segment(data = loadings_c2,
               aes(x = 0, y = 0, xend = PC1, yend = PC2),
               arrow = arrow(length = unit(0.2, "cm")),
               colour = "grey40") +
  geom_text(data = loadings_c2,
            aes(x = PC1, y = PC2, label = attribute),
            hjust = 0.5, vjust = -0.4, colour = "grey40", size = 3) +
  geom_hline(yintercept = 0, linetype = "dashed", colour = "grey75") +
  geom_vline(xintercept = 0, linetype = "dashed", colour = "grey75") +
  coord_equal(xlim = c(min(scores_c2$PC1) - 0.8, max(scores_c2$PC1) + 0.8),
              ylim = c(min(scores_c2$PC2) - 0.8, max(scores_c2$PC2) + 0.8),
              expand = TRUE) +
  labs(
    title = "Perceptual Map of Banks – Cluster 2",
    x = "Overall Digital Banking Performance",
    y = "Customer Support vs. Reliability"
  ) +
  theme_minimal(base_size = 12) +
  theme(
    plot.title = element_text(hjust = 0.5, face = "bold"),
    panel.grid.minor = element_blank()
  )

```

```{r}
bank_pc2_2 <- scores_c2 %>%
  select(bank_label, PC2) %>%
  left_join(
    bank_attr_mat2 %>%
      tibble::rownames_to_column("bank_label"),
    by = "bank_label"
  )

bank_pc2_2

```
```{r}
load_table2 <- as.data.frame(pca_banks_c2$rotation[, 1:2])
load_table2$attribute <- rownames(load_table2)
rownames(load_table2) <- NULL

load_table2

```

```{r}
pc2_load2 <- load_table2$PC2
names(pc2_load2) <- load_table2$attribute

contrib_pc2_2 <- bank_pc2_2 %>%
  mutate(
    contrib_customer_support = customer_support * pc2_load2["customer_support"],
    contrib_innovation       = innovation       * pc2_load2["innovation"],
    contrib_reliability      = reliability      * pc2_load2["reliability"]
  )

contrib_pc2_2

```

```{r}
library(ggplot2)
library(dplyr)
library(tidyr)

## PC2 loadings for cluster 2
pc2_load2 <- load_table2$PC2
names(pc2_load2) <- load_table2$attribute

## Contribution scores table for cluster 2
contrib_pc2_2 <- bank_pc2_2 %>%
  mutate(
    contrib_customer_support = customer_support * pc2_load2["customer_support"],
    contrib_innovation       = innovation       * pc2_load2["innovation"],
    contrib_reliability      = reliability      * pc2_load2["reliability"]
  )

## Long format for plotting
contrib_pc2_2_long <- contrib_pc2_2 %>%
  select(bank_label,
         contrib_customer_support,
         contrib_innovation,
         contrib_reliability) %>%
  pivot_longer(
    cols = starts_with("contrib_"),
    names_to = "attribute",
    values_to = "contribution"
  ) %>%
  mutate(attribute = gsub("contrib_", "", attribute))

## Bar plot
ggplot(contrib_pc2_2_long,
       aes(x = attribute, y = contribution, fill = attribute)) +
  geom_col(show.legend = FALSE) +
  facet_wrap(~ bank_label) +
  theme_minimal() +
  labs(
    title = "Approximate attribute contributions to Dimension 2 – Cluster 2",
    x = "Attribute",
    y = "Contribution to Dim2"
  )

```

```{r}
library(dplyr)
library(purrr)
library(tidyr)

# make sure logical combo vars are numeric for testing
bank_groups_test <- bank_groups |>
  mutate(
    across(
      c(revolut_only, nlb_revolut, otp_revolut, revolut_other),
      ~ as.integer(.)
    )
  )

# helper: chi-square with simulated p-value fallback if expected counts are small
run_cluster_sig_test <- function(data, var_name) {
  tab <- table(data$cluster, data[[var_name]])

  chi <- suppressWarnings(chisq.test(tab))

  if (any(chi$expected < 5)) {
    chi_sim <- chisq.test(tab, simulate.p.value = TRUE, B = 10000)

    tibble(
      group = var_name,
      test = "Chi-square (simulated p-value)",
      statistic = unname(chi$statistic),
      p_value = chi_sim$p.value
    )
  } else {
    tibble(
      group = var_name,
      test = "Chi-square",
      statistic = unname(chi$statistic),
      p_value = chi$p.value
    )
  }
}

# overall significance for each bank-combo across clusters
combo_significance <- bind_rows(
  lapply(
    c("revolut_only", "nlb_revolut", "otp_revolut", "revolut_other"),
    function(x) run_cluster_sig_test(bank_groups_test, x)
  )
) |>
  mutate(p_adj_bh = p.adjust(p_value, method = "BH")) |>
  arrange(p_value)

combo_significance
```

```{r}
pairwise_cluster_props <- function(data, var_name) {
  counts <- data |>
    group_by(cluster) |>
    summarise(
      users = sum(.data[[var_name]], na.rm = TRUE),
      n = n(),
      .groups = "drop"
    )

  pw <- pairwise.prop.test(
    x = counts$users,
    n = counts$n,
    p.adjust.method = "BH"
  )

  as.data.frame(as.table(pw$p.value)) |>
    filter(!is.na(Freq)) |>
    rename(
      cluster_1 = Var1,
      cluster_2 = Var2,
      p_adj_bh = Freq
    ) |>
    mutate(group = var_name, .before = 1)
}

pairwise_cluster_props(bank_groups_test, "revolut_only")
pairwise_cluster_props(bank_groups_test, "nlb_revolut")
pairwise_cluster_props(bank_groups_test, "otp_revolut")
pairwise_cluster_props(bank_groups_test, "revolut_other")
```

```{r}
segment_tab <- table(bank_segments$cluster, bank_segments$segment)

segment_test <- chisq.test(segment_tab, simulate.p.value = TRUE, B = 10000)
segment_test
```

```{r}
run_segment_sig <- function(data, segment_name) {
  tmp <- data |>
    mutate(in_segment = as.integer(segment == segment_name))

  run_cluster_sig_test(tmp, "in_segment") |>
    mutate(segment = segment_name, .before = 1) |>
    select(segment, everything(), -group)
}

segment_significance <- bind_rows(
  run_segment_sig(bank_segments, "Revolut only"),
  run_segment_sig(bank_segments, "NLB + Revolut"),
  run_segment_sig(bank_segments, "OTP + Revolut")
) |>
  mutate(p_adj_bh = p.adjust(p_value, method = "BH"))

segment_significance
```

```{r}
pairwise_segment_props <- function(data, segment_name) {
  counts <- data |>
    mutate(in_segment = as.integer(segment == segment_name)) |>
    group_by(cluster) |>
    summarise(
      users = sum(in_segment, na.rm = TRUE),
      n = n(),
      .groups = "drop"
    )

  pw <- pairwise.prop.test(
    x = counts$users,
    n = counts$n,
    p.adjust.method = "BH"
  )

  as.data.frame(as.table(pw$p.value)) |>
    filter(!is.na(Freq)) |>
    rename(
      cluster_1 = Var1,
      cluster_2 = Var2,
      p_adj_bh = Freq
    ) |>
    mutate(segment = segment_name, .before = 1)
}

pairwise_segment_props(bank_segments, "Revolut only")
pairwise_segment_props(bank_segments, "NLB + Revolut")
pairwise_segment_props(bank_segments, "OTP + Revolut")
```

```{r}
cluster_5_wants_needs <- cluster_means_pca2_5_named |>
  filter(cluster == "AI-enthusiastic guidance seekers")

cluster_5_wants_needs
```

```{r}
library(dplyr)
library(purrr)
library(tidyr)

# keep only clusters 2, 3, and 5
bank_groups_235 <- bank_groups |>
  filter(cluster %in% c(
    "Cautious guidance seekers",
    "Feature-oriented adopters",
    "AI-enthusiastic guidance seekers"
  )) |>
  mutate(
    cluster = droplevels(cluster),
    across(
      c(revolut_only, nlb_revolut, otp_revolut, revolut_other),
      ~ as.integer(.)
    )
  )
```

```{r}
run_cluster_sig_test <- function(data, var_name) {
  tab <- table(data$cluster, data[[var_name]])
  chi <- suppressWarnings(chisq.test(tab))
  
  if (any(chi$expected < 5)) {
    chi_sim <- chisq.test(tab, simulate.p.value = TRUE, B = 10000)
    
    tibble(
      group = var_name,
      test = "Chi-square (simulated p-value)",
      statistic = unname(chi$statistic),
      p_value = chi_sim$p.value
    )
  } else {
    tibble(
      group = var_name,
      test = "Chi-square",
      statistic = unname(chi$statistic),
      p_value = chi$p.value
    )
  }
}

overall_sig_235 <- bind_rows(
  run_cluster_sig_test(bank_groups_235, "revolut_only"),
  run_cluster_sig_test(bank_groups_235, "nlb_revolut"),
  run_cluster_sig_test(bank_groups_235, "otp_revolut"),
  run_cluster_sig_test(bank_groups_235, "revolut_other")
) |>
  mutate(p_adj_bh = p.adjust(p_value, method = "BH")) |>
  arrange(p_value)

overall_sig_235
```

```{r}
run_pair_test <- function(data, var_name, cl1, cl2) {
  tmp <- data |>
    filter(cluster %in% c(cl1, cl2)) |>
    mutate(cluster = droplevels(cluster))
  
  counts <- tmp |>
    group_by(cluster) |>
    summarise(
      users = sum(.data[[var_name]], na.rm = TRUE),
      n = n(),
      .groups = "drop"
    )
  
  test <- prop.test(
    x = counts$users,
    n = counts$n,
    correct = FALSE
  )
  
  tibble(
    group = var_name,
    cluster_1 = cl1,
    cluster_2 = cl2,
    users_1 = counts$users[1],
    n_1 = counts$n[1],
    pct_1 = round(100 * counts$users[1] / counts$n[1], 1),
    users_2 = counts$users[2],
    n_2 = counts$n[2],
    pct_2 = round(100 * counts$users[2] / counts$n[2], 1),
    statistic = unname(test$statistic),
    p_value = test$p.value
  )
}

cluster_pairs_235 <- list(
  c("Cautious guidance seekers", "Feature-oriented adopters"),
  c("Cautious guidance seekers", "AI-enthusiastic guidance seekers"),
  c("Feature-oriented adopters", "AI-enthusiastic guidance seekers")
)

bank_vars <- c("revolut_only", "nlb_revolut", "otp_revolut", "revolut_other")

pairwise_sig_235 <- map_dfr(bank_vars, function(v) {
  map_dfr(cluster_pairs_235, function(p) {
    run_pair_test(bank_groups_235, v, p[1], p[2])
  })
}) |>
  group_by(group) |>
  mutate(p_adj_bh = p.adjust(p_value, method = "BH")) |>
  ungroup() |>
  arrange(group, p_value)

pairwise_sig_235
```

```{r}
pairwise_sig_235 |>
  filter(p_adj_bh < 0.05)
```

```{r}
bank_groups_235 |>
  group_by(cluster) |>
  summarise(
    n_cluster = n(),
    revolut_only_n = sum(revolut_only, na.rm = TRUE),
    revolut_only_pct = round(100 * revolut_only_n / n_cluster, 1),
    nlb_revolut_n = sum(nlb_revolut, na.rm = TRUE),
    nlb_revolut_pct = round(100 * nlb_revolut_n / n_cluster, 1),
    otp_revolut_n = sum(otp_revolut, na.rm = TRUE),
    otp_revolut_pct = round(100 * otp_revolut_n / n_cluster, 1),
    revolut_other_n = sum(revolut_other, na.rm = TRUE),
    revolut_other_pct = round(100 * revolut_other_n / n_cluster, 1)
  )
```