Learning R: Creating Composite Variables

Load Packages

haven

Import and Export SPSS, STATA, and SAS files

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

Loading required package: haven

psych

Procedures for psychological, psychometric, and personality research

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

Loading required package: psych

summarytools

A collection of tools to quickly and neatly summarize the data.

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

Loading required package: summarytools

Warning in fun(libname, pkgname): couldn't connect to display ":0"

system might not have X11 capabilities; in case of errors when using dfSummary(), set st_options(use.x11 = FALSE)

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

Reliability

Extraversion alpha 0.8141661