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psych (version 1.0-25)

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

1.0-25

License

GPL version 2 or newer

Homepage

http://personality-project.org/r

Maintainer

William Revelle

Last Published

March 21st, 2025

Functions in psych (1.0-25)

Plot a scree test

create control code for ICLUST graphical output

factor.congruence

Coefficient of factor congruence

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

Find correlations of composite variables from a larger matrix

Basic descriptive statistics useful for psychometrics

Simulate a congeneric data set

create VSS like data

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

factor.residuals

circ.simulation

Simulations of circumplex and simple structure

Find dis-attenuated correlations and give alpha reliabilities

Cronbach alpha for a scale

"Hand" rotate a factor loading matrix

Generate simulated data structures for circumplex or simple structure

Draw an ICLUST graph using the Rgraphviz package

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

Fisher z transform of r

Create demo data for psychometrics

Find polychoric correlations of item data

matrix.addition

A function to add two vectors or matrices

Apply four tests of circumplex versus simple structure

Graph factor loading matrices

cluster.loadings

Find item by cluster correlations, corrected for overlap and reliability

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

Plot x and y error bars

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

Function to form hierarchical cluster analysis of items

sort items by absolute size of cluster loadins

Testing of functions in the psych package

make.hierarchical

Create a population or sample correlation matrix with hierachical structure.

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

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

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

Calculate the omega estimate of factor saturation

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

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

Compare real and random VSS solutions

irt.item.diff.rasch

Simple function to estimate item difficulties using IRT concepts

Graph hierarchical factor structures

SPLOM, histograms and correlations for a data matrix

Extract cluster definitions from factor loadings

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

Basic summary statistics by group

Kurtosis of a vector, matrix, or data frame

00psych-package

A package for personality, psychometric, and psychological research

Test the difference between paired correlations

polychor.matrix

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

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

Principal Axis Factor Analysis

Convert a phi coefficient to a polychoric correlation

Multiple histograms on one screen

Find the phi coefficient of correlation between two dichotomous variables

Multiple Regression from matrix input

Principal components analysis

Apply the Schmid Leiman transformation to a correlation matrix

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

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

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