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psych (version 1.0-63)

Procedures for Personality, Psychometric, and Psychological Research

Description

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

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Install

install.packages('psych')

Monthly Downloads

133,643

Version

1.0-63

License

GPL version 2 or newer

Homepage

http://personality-project.org/r

Maintainer

William Revelle

Last Published

June 23rd, 2025

Functions in psych (1.0-63)

Alternative estimates of test reliabiity

From a two by two table, find the Yule coefficients of association, convert to phi, or polychoric, recreate table the table to create the Yule coefficient.

Apply the Very Simple Structure and MAP criteria to determine the appropriate number of factors.

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

Two data sets showing a bifactor solution.

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

Plot data and 1 and 2 sigma correlation ellipses

Find the interpolated sample median, quartiles, or specific quantiles for a vector, matrix, or data frame

cortest.bartlett

Bartlett's test that a correlation matrix is an identity matrix

13 personality scales from the Eysenck Personality Inventory and Big 5 inventory

Find correlations of composite variables from a larger matrix

Plot x and y error bars

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

matrix.addition

A function to add two vectors or matrices

Plot a scree test

Calculate the omega estimate of factor saturation

Graph hierarchical factor structures

Galton's example of the relationship between height and 'cubit' or forearm length

Function to form hierarchical cluster analysis of items

Find the Standard deviation for a vector, matrix, or data.frame - do not return error if there are no cases

Convert base rates of two diagnoses and their comorbidity into phi, Yule, and tetrachorics

Galton's Mid parent child height data

structure.graph

Draw a structural equation model specified by two measurement models and a structural model

create control code for ICLUST graphical output

Plot means and confidence intervals

Functions for analysis of circadian or diurnal data

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

Functions to simulate psychological/psychometric data

factor.residuals

Apply four tests of circumplex versus simple structure

Find dis-attenuated correlations given correlations and reliabilities

Test the adequacy of simple choice, logistic, or Thurstonian scaling.

Fisher r to z and z to r and confidence intervals

Paired comparison of preferences for 9 vegetables

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

Perform promax rotation and return the inter factor angles

Chi square tests of whether a single matrix is an identity matrix, or a pair of matrices are equal.

Multiple Regression from matrix input

Extract cluster definitions from factor loadings

Compare real and random VSS solutions

Print and summary functions for the psych class

14 multiple choice IQ items

factor.congruence

Coefficient of factor congruence

cluster.loadings

Find item by cluster correlations, corrected for overlap and reliability

irt.item.diff.rasch

Simple function to estimate item difficulties using IRT concepts

Multiple histograms with density and normal fits on one page

Principal Axis Factor Analysis

Find the Winsorized scores or means for a vector, matrix, or data.frame

Combine calls to head and tail

Principal components analysis

Convert Cartesian factor loadings into polar coordinates

Form a super matrix from two sub matrices.

Find the phi coefficient of correlation between two dichotomous variables

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

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

25 Personality items representing 5 factors

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

Sort items by absolute size of cluster loadings

Create correlation matrices or data matrices with a particular measurement and structural model

Convert a cluster vector (from e.g., kmeans) to a keys matrix suitable for scoring item clusters.

Basic summary statistics by group

shortcut for reading from the clipboard

Basic descriptive statistics useful for psychometrics

Simulate a congeneric data set

Intraclass Correlations (ICC1, ICC2, ICC3 from Shrout and Fleiss)

Distances between 11 US cities

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

Draw an ICLUST graph using the Rgraphviz package

Find Cohen's kappa and weighted kappa coefficients for correlation of two raters

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

Create a keys matrix for use by score.items or cluster.cor

Thurstone Case V scaling

Apply the Schmid Leiman transformation to a correlation matrix

Tests of significance for correlations

Testing of functions in the psych package

Find the trace of a square matrix

Convert a phi coefficient to a polychoric correlation

``Hand" rotate a factor loading matrix

Graph factor loading matrices

Find the Squared Multiple Correlation (SMC) of each variable with the remaining variables in a matrix

Create demo data for psychometrics

Function to convert scores to ``conventional " metrics

Generate simulated data structures for circumplex or simple structure

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

Create factor model matrices from an input list

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

score.multiple.choice

Score multiple choice items and provide basic test statistics

Find the partial correlations for a set (x) of variables with set (y) removed.

Test the difference between (un)paired correlations

SPLOM, histograms and correlations for a data matrix

Find polychoric correlations of item data

Cronbach alpha for a scale

create VSS like data

Plot means and confidence intervals for multiple groups

A data.frame of the Galton (1888) height and cubit data set.

Find the probability of replication for an F, t, or r and estimate effect size

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

Convert a table with counts to a matrix or data.frame representing those counts.

simulation.circ

Simulations of circumplex and simple structure

Plotting functions for the psych package of class ``psych"

3 Measures of ability: SATV, SATQ, ACT

Plot factor/cluster loadings and assign items to clusters by their highest loading.

polychor.matrix

Phi or Yule coefficient matrix to polychoric coefficient matrix

A package for personality, psychometric, and psychological research

sim.hierarchical

Create a population or sample correlation matrix, perhaps with hierarchical structure.