psych - Procedures for Psychological, Psychometric, and Personality
Research
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.
