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psych (version 1.0-91)

Procedures for Psychological, Psychometric, and Personality 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. Functions for simulating particular item and test structures are included. Several functions serve as a useful front end for structural equation modeling. Graphical displays of path diagrams, factor analysis and structural equation models are created using basic graphics. Some of the functions are written to support a book on psychometrics as well as publications in personality research. For more information, see the personality-project.org/r webpage.

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Install

install.packages('psych')

Monthly Downloads

240,452

Version

1.0-91

License

GPL (>= 2)

Homepage

http://personality-project.org/r

Maintainer

William Revelle

Last Published

September 15th, 2010

Functions in psych (1.0-91)

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

9 Cognitive variables discussed by Tucker and Lewis (1973)

Plot the successive eigen values for a scree test

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

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

Create a block randomized structure for n independent variables

US family income from US census 2008

Sort items by absolute size of cluster loadings

25 Personality items representing 5 factors

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

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

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

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

Function to convert scores to ``conventional " metrics

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.

Distances between 11 US cities

Alternative estimates of test reliabiity

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

irt.item.diff.rasch

Simple function to estimate item difficulties using IRT concepts

Create an image plot for a correlation or factor matrix

Functions for analysis of circadian or diurnal data

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

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

Perform promax or targeted rotations and return the inter factor angles

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

Convert a phi coefficient to a polychoric correlation

Plot x and y error bars

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

Principal components analysis

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

Galton's Mid parent child height data

14 multiple choice IQ items

Graph factor loading matrices

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

Sort factor analysis or principal components analysis loadings

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

Bond's Logical Operations Test -- BLOT

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

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

Multiple histograms with density and normal fits on one page

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

Seven data sets showing a bifactor solution.

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

Plot means and confidence intervals

Compare real and random VSS solutions

Item Response Analysis by factor analysis of tetrachoric/polychoric correlations

Tests of significance for correlations

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

cortest.bartlett

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

Plot data and 1 and 2 sigma correlation ellipses

Basic summary statistics by group

score.multiple.choice

Score multiple choice items and provide basic test statistics

Function to form hierarchical cluster analysis of items

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

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

Multiple Regression from matrix input

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

factor.residuals

Sort the elements of a correlation matrix to reflect factor loadings

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

factor.congruence

Coefficient of factor congruence

Functions to simulate psychological/psychometric data.

Plot means and confidence intervals for multiple groups

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

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

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

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

Fisher r to z and z to r and confidence intervals

Apply four tests of circumplex versus simple structure

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

matrix.addition

A function to add two vectors or matrices

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

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

structure.diagram

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

Find the greatest lower bound to reliability.

Generate simulated data structures for circumplex or simple structure

11 emotional variables from Burt (1915)

NEO correlation matrix from the NEO_PI_R manual

Find the trace of a square matrix

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

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

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

Simulate a congeneric data set

Combine calls to head and tail

A package for personality, psychometric, and psychological research

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

Helper functions for drawing path model diagrams

Find dis-attenuated correlations given correlations and reliabilities

Draw an ICLUST graph using the Rgraphviz package

Basic descriptive statistics useful for psychometrics

create VSS like data

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

create control code for ICLUST graphical output

Extract cluster definitions from factor loadings

SPLOM, histograms and correlations for a data matrix

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

Find the phi coefficient of correlation between two dichotomous variables

75 mood items from the Motivational State Questionnaire for 3896 participants

simulation.circ

Simulations of circumplex and simple structure

Test the difference between (un)paired correlations

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

``Hand" rotate a factor loading matrix

polychor.matrix

Phi or Yule coefficient matrix to polychoric coefficient matrix

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

Graph hierarchical factor structures

Convert Cartesian factor loadings into polar coordinates

Paired comparison of preferences for 9 vegetables

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

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

Create factor model matrices from an input list

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

Print and summary functions for the psych class

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

Testing of functions in the psych package

Thurstone Case V scaling

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

shortcut for reading from the clipboard

3 Measures of ability: SATV, SATQ, ACT

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

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

Reverse the coding of selected items prior to scale analysis

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

Form a super matrix from two sub matrices.

Draw an ICLUST hierarchical cluster structure diagram

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

Find correlations of composite variables from a larger matrix

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

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

cluster.loadings

Find item by cluster correlations, corrected for overlap and reliability

sim.hierarchical

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