A general purpose toolbox for personality, psychometric theory and experimental psychology. Functions are primarily for multivariate analysis and scale construction using factor analysis, principal component analysis, cluster analysis and reliability analysis, although others provide basic descriptive statistics. Item Response Theory is done using factor analysis of tetrachoric and polychoric correlations. Functions for analyzing data at multiple levels include within and between group statistics, including correlations and factor analysis. Functions for simulating and testing particular item and test structures are included. Several functions serve as a useful front end for structural equation modeling. Graphical displays of path diagrams, factor analysis and structural equation models are created using basic graphics. Some of the functions are written to support a book on psychometric theory as well as publications in personality research. For more information, see the <https://personalityproject.org/r> web page.
Package details 


Author  William Revelle [aut, cre] (<https://orcid.org/0000000348809610>) 
Maintainer  William Revelle <revelle@northwestern.edu> 
License  GPL (>= 2) 
Version  1.9.12.31 
URL  https://personalityproject.org/r/psych https://personalityproject.org/r/psychmanual.pdf 
Package repository  View on CRAN 
Installation 
Install the latest version of this package by entering the following in R:

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