This tutorial follows the steps in Watkins (2020). The first three chapters are introductory and I won’t cover them here. Also, the text is specific to Rstudio and I’m using Positron, so I’ll translate the code appropriately.

Importing and Saving Data and Results

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#load required libraries
library(psych)

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# Read  data files into R. Files were downloaded from the resources site (CH.2) as .xls and I have converted them to .csv using the 'Save-As' command in MS Excel.
# Create a dataframe called `df_iq`
# Display the first 6 rows of `df_iq`
df_iq <- read.csv(file = "stepwise-efa-data/iq.csv")
head(df_iq)

  vocab1 designs1 similar1 matrix1 veranal2 vocab2 matrix2 designs2
1    113      124      118     122      116    115     127      105
2    100       95      115      97      121    102     106      112
3    124      115      122     116      117    109     119      118
4    125      110      124     130      114    115     126      127
5    103       89      109      91      106    102     101       97
6     88      113       89     110       96     88     109      111

References

Watkins, M. (2020). A Step-by-Step Guide to Exploratory Factor Analysis with R and RStudio (1st ed.). Routledge. https://doi.org/10.4324/9781003120001