`install.packages('psych')`

201,650

1.8.12

GPL (>= 2)

January 12th, 2019

Garcia

Data from the sexism (protest) study of Garcia, Schmitt, Branscome, and Ellemers (2010)

Gleser

Example data from Gleser, Cronbach and Rajaratnam (1965) to show basic principles of generalizability theory.

VSS

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

ICLUST.graph

create control code for ICLUST graphical output

SD

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

VSS.parallel

Compare real and random VSS solutions

bfi

25 Personality items representing 5 factors

bi.bars

Draw pairs of bargraphs based on two groups

blot

Bond's Logical Operations Test -- BLOT

Schmid

12 variables created by Schmid and Leiman to show the Schmid-Leiman Transformation

VSS.plot

Plot VSS fits

bock

Bock and Liberman (1970) data set of 1000 observations of the LSAT

cluster2keys

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

VSS.scree

Plot the successive eigen values for a scree test

00.psych

A package for personality, psychometric, and psychological research

cohen.d

Find Cohen d and confidence intervals

AUC

Decision Theory measures of specificity, sensitivity, and d prime

Schutz

The Schutz correlation matrix example from Shapiro and ten Berge

KMO

Find the Kaiser, Meyer, Olkin Measure of Sampling Adequacy

Promax

Perform Procustes,bifactor, promax or targeted rotations and return the inter factor angles.

burt

11 emotional variables from Burt (1915)

Tucker

9 Cognitive variables discussed by Tucker and Lewis (1973)

cor.wt

The sample size weighted correlation may be used in correlating aggregated data

Yule

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

cattell

12 cognitive variables from Cattell (1963)

ability

16 ability items scored as correct or incorrect.

affect

Two data sets of affect and arousal scores as a function of personality and movie conditions

bassAckward

The Bass-Ackward factoring algorithm discussed by Goldberg

comorbidity

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

bestScales

A bootstrap aggregation (bagging) function for choosing most predictive items

cor2dist

Convert correlations to distances (necessary to do multidimensional scaling of correlation data)

circ.tests

Apply four tests of circumplex versus simple structure

densityBy

Create a 'violin plot' or density plot of the distribution of a set of variables

alpha

Find two estimates of reliability: Cronbach's alpha and Guttman's Lambda 6.

fa.poly

Deprecated Exploratory Factor analysis functions. Please use fa

Bechtoldt

Seven data sets showing a bifactor solution.

cities

Distances between 11 US cities

eigen.loadings

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

cor.plot

Create an image plot for a correlation or factor matrix

cor.ci

Bootstrapped confidence intervals for raw and composite correlations

cluster.loadings

Find item by cluster correlations, corrected for overlap and reliability

biplot.psych

Draw biplots of factor or component scores by factor or component loadings

ellipses

Plot data and 1 and 2 sigma correlation ellipses

cor.smooth

Smooth a non-positive definite correlation matrix to make it positive definite

cluster.plot

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

corFiml

Find a Full Information Maximum Likelihood (FIML) correlation or covariance matrix from a data matrix with missing data

ICC

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

corr.test

Find the correlations, sample sizes, and probability values between elements of a matrix or data.frame.

cortest.mat

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

correct.cor

Find dis-attenuated correlations given correlations and reliabilities

iclust

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

scoreOverlap

Find correlations of composite variables (corrected for overlap) from a larger matrix.

cosinor

Functions for analysis of circadian or diurnal data

ICLUST.rgraph

Draw an ICLUST graph using the Rgraphviz package

cubits

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

cluster.fit

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

fa

Exploratory Factor analysis using MinRes (minimum residual) as well as EFA by Principal Axis, Weighted Least Squares or Maximum Likelihood

fa.diagram

Graph factor loading matrices

ICLUST.sort

Sort items by absolute size of cluster loadings

factor.fit

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

blant

A 29 x 29 matrix that produces weird factor analytic results

diagram

Helper functions for drawing path model diagrams

draw.tetra

Draw a correlation ellipse and two normal curves to demonstrate tetrachoric correlation

factor.model

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

cushny

A data set from Cushny and Peebles (1905) on the effect of three drugs on hours of sleep, used by Student (1908)

pairwiseCount

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

error.bars

Plot means and confidence intervals

cta

Simulate the C(ues) T(endency) A(ction) model of motivation

cortest.bartlett

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

block.random

Create a block randomized structure for n independent variables

dummy.code

Create dummy coded variables

error.bars.by

Plot means and confidence intervals for multiple groups

errorCircles

Two way plots of means, error bars, and sample sizes

Dwyer

8 cognitive variables used by Dwyer for an example.

heights

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

iclust.diagram

Draw an ICLUST hierarchical cluster structure diagram

income

US family income from US census 2008

error.crosses

Plot x and y error bars

describe

Basic descriptive statistics useful for psychometrics

describeBy

Basic summary statistics by group

fa.multi

Multi level (hierarchical) factor analysis

interp.median

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

fa.sort

Sort factor analysis or principal components analysis loadings

fa.parallel

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

factor.congruence

Coefficient of factor congruence

df2latex

Convert a data frame, correlation matrix, or factor analysis output to a LaTeX table

fisherz

Transformations of r, d, and t including Fisher r to z and z to r and confidence intervals

fparse

Parse and exten formula input from a model and return the DV, IV, and associated terms.

fa.random

A first approximation to Random Effects Exploratory Factor Analysis

irt.responses

Plot probability of multiple choice responses as a function of a latent trait

factor.residuals

R* = R- F F'

multilevel.reliability

Find and plot various reliability/gneralizability coefficients for multilevel data

dfOrder

Sort (order) a dataframe or matrix by multiple columns

kaiser

Apply the Kaiser normalization when rotating factors

faCor

Correlations between two factor analysis solutions

error.dots

Show a dot.chart with error bars for different groups or variables

factor.scores

Various ways to estimate factor scores for the factor analysis model

epi

Eysenck Personality Inventory (EPI) data for 3570 participants

factor.stats

Find various goodness of fit statistics for factor analysis and principal components

epi.bfi

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

factor.rotate

``Hand" rotate a factor loading matrix

glb.algebraic

Find the greatest lower bound to reliability.

psych.misc

Miscellaneous helper functions for the psych package

esem

Perform and Exploratory Structural Equation Model (ESEM) by using factor extension techniques

splitHalf

Alternative estimates of test reliabiity

mixedCor

Find correlations for mixtures of continuous, polytomous, and dichotomous variables

polychor.matrix

Phi or Yule coefficient matrix to polychoric coefficient matrix

galton

Galton's Mid parent child height data

predict.psych

Prediction function for factor analysis or principal components

fa.lookup

A set of functions for factorial and empirical scale construction

fa.extension

Apply Dwyer's factor extension to find factor loadings for extended variables

sai

State Anxiety data from the PMC lab over multiple occasions.

cohen.kappa

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

neo

NEO correlation matrix from the NEO_PI_R manual

factor2cluster

Extract cluster definitions from factor loadings

irt.item.diff.rasch

Simple function to estimate item difficulties using IRT concepts

geometric.mean

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

irt.1p

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

Utility

Useful utility functions for file/directory exploration and manipulation.

harmonic.mean

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

logistic

Logistic transform from x to p and logit transform from p to x

matrix.addition

A function to add two vectors or matrices

manhattan

"Manhattan" plots of correlations with a set of criteria.

sat.act

3 Measures of ability: SATV, SATQ, ACT

headTail

Combine calls to head and tail

mediate

Estimate and display direct and indirect effects of mediators and moderator in path models

multi.hist

Multiple histograms with density and normal fits on one page

mssd

Find von Neuman's Mean Square of Successive Differences

msq

75 mood items from the Motivational State Questionnaire for 3896 participants

parcels

Find miniscales (parcels) of size 2 or 3 from a set of items

msqR

75 mood items from the Motivational State Questionnaire for 3032 unique participants

peas

Galton`s Peas

scoreIrt

Find Item Response Theory (IRT) based scores for dichotomous or polytomous items

outlier

Find and graph Mahalanobis squared distances to detect outliers

partial.r

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

mat.sort

Sort the elements of a correlation matrix to reflect factor loadings

omega

Calculate McDonald's omega estimates of general and total factor saturation

phi.demo

A simple demonstration of the Pearson, phi, and polychoric corelation

omega.graph

Graph hierarchical factor structures

iqitems

16 multiple choice IQ items

scoreItems

Score item composite scales and find Cronbach's alpha, Guttman lambda 6 and item whole correlations

phi

Find the phi coefficient of correlation between two dichotomous variables

phi2tetra

Convert a phi coefficient to a tetrachoric correlation

read.file

Shortcuts for reading from the clipboard or a file

rescale

Function to convert scores to ``conventional
" metrics

irt.fa

Item Response Analysis by Exploratory Factor Analysis of tetrachoric/polychoric correlations

lowerUpper

Combine two square matrices to have a lower off diagonal for one, upper off diagonal for the other

sim.item

Generate simulated data structures for circumplex, spherical, or simple structure

make.keys

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

r.test

Tests of significance for correlations

p.rep

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

schmid

Apply the Schmid Leiman transformation to a correlation matrix

scaling.fits

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

scatterHist

Draw a scatter plot with associated X and Y histograms, densities and correlation

principal

Principal components analysis (PCA)

rangeCorrection

Correct correlations for restriction of range. (Thorndike Case 2)

paired.r

Test the difference between (un)paired correlations

print.psych

Print and summary functions for the psych class

score.alpha

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

structure.list

Create factor model matrices from an input list

sim.structure

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

sim.multilevel

Simulate multilevel data with specified within group and between group correlations

test.irt

A simple demonstration (and test) of various IRT scoring algorthims.

pairs.panels

SPLOM, histograms and correlations for a data matrix

test.psych

Testing of functions in the psych package

sim.anova

Simulate a 3 way balanced ANOVA or linear model, with or without repeated measures.

sim.VSS

create VSS like data

superMatrix

Form a super matrix from two sub matrices.

testRetest

Find various test-retest statistics, including test, person and item reliability

thurstone

Thurstone Case V scaling

tetrachoric

Tetrachoric, polychoric, biserial and polyserial correlations from various types of input

setCor

Multiple Regression and Set Correlation from matrix or raw input

sim

Functions to simulate psychological/psychometric data.

plot.psych

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

polar

Convert Cartesian factor loadings into polar coordinates

residuals.psych

Extract residuals from various psych objects

reverse.code

Reverse the coding of selected items prior to scale analysis

score.multiple.choice

Score multiple choice items and provide basic test statistics

tr

Find the trace of a square matrix

mardia

Calculate univariate or multivariate (Mardia's test) skew and kurtosis for a vector, matrix, or data.frame

scrub

A utility for basic data cleaning and recoding. Changes values outside of minimum and maximum limits to NA.

sim.congeneric

Simulate a congeneric data set

simulation.circ

Simulations of circumplex and simple structure

spi

A sample from the SAPA Personality Inventory including an item dictionary and scoring keys.

spider

Make "radar" or "spider" plots.

smc

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

table2matrix

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

sim.hierarchical

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

Tal_Or

Data set testing causal direction in presumed media influence

statsBy

Find statistics (including correlations) within and between groups for basic multilevel analyses

structure.diagram

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

unidim

Several indices of the unidimensionality of a set of variables.

vegetables

Paired comparison of preferences for 9 vegetables

winsor

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

withinBetween

An example of the distinction between within group and between group correlations

ICLUST.cluster

Function to form hierarchical cluster analysis of items

Gorsuch

Example data set from Gorsuch (1997) for an example factor extension.

Harman

Five data sets from Harman (1967). 9 cognitive variables from Holzinger and 8 emotional variables from Burt