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psych (version 1.0-27)

Procedures for Personality and Psychological Research

Description

A number of routines for personality, psychometrics and experimental psychology. Functions are primarily for scale construction and reliability analysis, although others are basic descriptive stats. For more information, see the personality-project.org/r.

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Version

Install

install.packages('psych')

Monthly Downloads

242,751

Version

1.0-27

License

GPL version 2 or newer

Homepage

http://personality-project.org/r

Maintainer

William Revelle

Last Published

March 21st, 2025

Functions in psych (1.0-27)

factor.congruence

Coefficient of factor congruence

Compare real and random VSS solutions

sort items by absolute size of cluster loadins

Draw an ICLUST graph using the Rgraphviz package

Scree plots of data or correlation matrix compared to random ``parallel" matrices

Plot x and y error bars

Find correlations of composite variables from a larger matrix

factor.residuals

matrix.addition

A function to add two vectors or matrices

Find the harmonic mean of a vector, matrix, or columns of a data.frame

Count number of pairwise cases for a data set with missing (NA) data.

ICLUST: Item Cluster Analysis -- Hierarchical cluster analysis using psychometric principles

Apply the Very Simple Structure criterion to determine the appropriate number of factors.

Find dis-attenuated correlations and give alpha reliabilities

Cronbach alpha for a scale

Plot a scree test

Fisher z transform of r

circ.simulation

Simulations of circumplex and simple structure

Item Response Theory estimate of theta (ability) using a Rasch (like) model

cluster Fit: fit of the cluster model to a correlation matrix

Find R = F F' + U2 is the basic factor model

Basic descriptive statistics useful for psychometrics

Principal Axis Factor Analysis

``Hand" rotate a factor loading matrix

irt.item.diff.rasch

Simple function to estimate item difficulties using IRT concepts

cluster.loadings

Find item by cluster correlations, corrected for overlap and reliability

create control code for ICLUST graphical output

Simulate a congeneric data set

Basic summary statistics by group

How well does the factor model fit a correlation matrix. Part of the VSS package

Graph hierarchical factor structures

Calculate the omega estimate of factor saturation

Multiple Regression from matrix input

Extract cluster definitions from factor loadings

Graph factor loading matrices

Test the difference between paired correlations

Apply four tests of circumplex versus simple structure

make.hierarchical

Create a population or sample correlation matrix with hierachical structure.

Principal components analysis

Generate simulated data structures for circumplex or simple structure

Find the geometric mean of a vector or columns of a data.frame.

Find polychoric correlations of item data

00psych-package

A package for personality, psychometric, and psychological research

SPLOM, histograms and correlations for a data matrix

Function to form hierarchical cluster analysis of items

create VSS like data

Calculate skew for a vector, matrix, or data.frame

Testing of functions in the psych package

Find the phi coefficient of correlation between two dichotomous variables

Create demo data for psychometrics

Multiple histograms on one screen

Score scales and find Cronbach's alpha as well as associated statistics

Score item composite scales and find Cronbach's alpha as well as associated statistics

Convert eigen vectors and eigen values to the more normal (for psychologists) component loadings

Kurtosis of a vector, matrix, or data frame

Apply the Schmid Leiman transformation to a correlation matrix

shortcut for reading from the clipboard

Convert a phi coefficient to a polychoric correlation

polychor.matrix

Actually, what does this do? Convert a matrix of phi coefficients to a matrix of polycoric correlations