Creating a Composite Variable

Load Packages

haven

if(!require(haven)){
  install.packages("haven", dependencies = TRUE)
  library(haven)
}

Loading required package: haven

tidyverse

if(!require(tidyverse)){
  install.packages("tidyverse", dependencies = TRUE)
  library(tidyverse)
}

Loading required package: tidyverse

── Attaching core tidyverse packages ──────────────────────── tidyverse 2.0.0 ──
✔ dplyr     1.1.4     ✔ readr     2.1.5
✔ forcats   1.0.0     ✔ stringr   1.5.1
✔ ggplot2   3.4.4     ✔ tibble    3.2.1
✔ lubridate 1.9.3     ✔ tidyr     1.3.1
✔ purrr     1.0.2     
── Conflicts ────────────────────────────────────────── tidyverse_conflicts() ──
✖ dplyr::filter() masks stats::filter()
✖ dplyr::lag()    masks stats::lag()
ℹ Use the conflicted package (<http://conflicted.r-lib.org/>) to force all conflicts to become errors

psych

if(!require(psych)){
  install.packages("psych", dependencies = TRUE)
  library(psych)
}

Loading required package: psych

Attaching package: 'psych'

The following objects are masked from 'package:ggplot2':

    %+%, alpha

Import Data

dataset <- read_sav("https://osf.io/kd4ej/download")

Scoring Variable

Extraversion <- data.frame (dataset$FFM_1, dataset$FFM_6, dataset$FFM_11, dataset$FFM_16, dataset$FFM_21, dataset$FFM_26, dataset$FFM_31, dataset$FFM_36)

Extraversion.keys <- make.keys(Extraversion, list(Extraversion=c(1,-2,3,4,-5,6,-7,8)))

Extraversion.scales <- scoreItems (Extraversion.keys, Extraversion)

Extraversion.scores <- Extraversion.scales$scores

dataset$Extraversion <- Extraversion.scores[,]

Extraversion.scales$alpha

      Extraversion
alpha    0.8141661