Package: psych
Version: 2.6.9
Date: 2026-09-22
Title: Procedures for Psychological, Psychometric, and Personality
        Research
Authors@R: person("William", "Revelle", role =c("aut","cre"), email="revelle@northwestern.edu", comment=c(ORCID  = "0000-0003-4880-9610") )
Description: A general purpose toolbox developed originally 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.  Validation and
        cross validation of scales developed using basic machine
        learning algorithms are provided, as are functions for
        simulating and testing particular item and test structures.
        Several functions serve as a useful front end for structural
        equation modeling.  Graphical displays of path diagrams,
        including mediation models, 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://personality-project.org/r/> web
        page.
License: GPL (>= 2)
Imports:
        mnormt,parallel,stats,graphics,grDevices,methods,lattice,nlme,GPArotation
Suggests: psychTools, lavaan, lme4, Rcsdp, graph, knitr, Rgraphviz
LazyData: yes
ByteCompile: true
VignetteBuilder: knitr
URL: https://personality-project.org/r/psych/
        https://personality-project.org/r/psych-manual.pdf
NeedsCompilation: no
Packaged: 2026-09-30 19:42:08 UTC; root
Author: William Revelle [aut, cre] (ORCID:
        <https://orcid.org/0000-0003-4880-9610>)
Maintainer: William Revelle <revelle@northwestern.edu>
Repository: https://rforms.r-universe.dev
Date/Publication: 2026-09-30 15:50:02 UTC
RemoteUrl: https://github.com/cran/psych
RemoteRef: HEAD
RemoteSha: f0e9e6f5beeaf5206c2b846f45a94edabb294d76
Built: R 4.6.0; ; 2026-09-30 19:45:07 UTC; unix
