Procedures for Personality and Psychological Research


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Documentation for package ‘psych’ version 1.0-42

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A B C D E F G H I K M O P R S T V W Y

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00.psych-package A package for personality, psychometric, and psychological research
psych-package A package for personality, psychometric, and psychological research

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%+% A function to add two vectors or matrices

-- A --

alpha.scale Cronbach alpha for a scale

-- B --

bfi 25 Personality items representing 5 factors

-- C --

circ.sim Generate simulated data structures for circumplex or simple structure
circ.sim.plot Simulations of circumplex and simple structure
circ.simulation Simulations of circumplex and simple structure
circ.tests Apply four tests of circumplex versus simple structure
cluster.cor Find correlations of composite variables from a larger matrix
cluster.fit cluster Fit: fit of the cluster model to a correlation matrix
cluster.loadings Find item by cluster correlations, corrected for overlap and reliability
cluster.plot Plot factor/cluster loadings and assign items to clusters by their highest loading
congeneric.sim Simulate a congeneric data set
correct.cor Find dis-attenuated correlations and give alpha reliabilities
count.pairwise Count number of pairwise cases for a data set with missing (NA) data.
cubits Galton's example of the relationship between height and 'cubit' or forearm length

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describe Basic descriptive statistics useful for psychometrics
describe.by Basic summary statistics by group

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eigen.loadings Convert eigen vectors and eigen values to the more normal (for psychologists) component loadings
ellipses Plot data and 1 and 2 sigma correlation ellipses
error.bars Plot means and confidence intervals
error.bars.by Plot means and confidence intervals for multiple groups
error.crosses Plot x and y error bars

-- F --

fa.graph Graph factor loading matrices
fa.parallel Scree plots of data or correlation matrix compared to random “parallel" matrices
factor.congruence Coefficient of factor congruence
factor.fit How well does the factor model fit a correlation matrix. Part of the VSS package
factor.model Find R = F F' + U2 is the basic factor model
factor.pa Principal Axis Factor Analysis
factor.residuals R* = R- F F'
factor.rotate “Hand" rotate a factor loading matrix
factor2cluster Extract cluster definitions from factor loadings
fisherz Fisher r to z and z to r and confidence intervals
fisherz2r Fisher r to z and z to r and confidence intervals

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galton Galton's Mid parent child height data
geometric.mean Find the geometric mean of a vector or columns of a data.frame.

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harmonic.mean Find the harmonic mean of a vector, matrix, or columns of a data.frame
headtail Combine calls to head and tail
heights A data.frame of the Galton (1888) height and cubit data set.
histo.density Multiple histograms with density and normal fits on one page

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ICLUST ICLUST: Item Cluster Analysis - Hierarchical cluster analysis using psychometric principles
ICLUST.cluster Function to form hierarchical cluster analysis of items
ICLUST.graph create control code for ICLUST graphical output
ICLUST.rgraph Draw an ICLUST graph using the Rgraphviz package
ICLUST.sort Sort items by absolute size of cluster loadings
interp.boxplot Find the interpolated sample median, quartiles, or specific quantiles for a vector, matrix, or data frame
interp.median Find the interpolated sample median, quartiles, or specific quantiles for a vector, matrix, or data frame
interp.q Find the interpolated sample median, quartiles, or specific quantiles for a vector, matrix, or data frame
interp.qplot.by Find the interpolated sample median, quartiles, or specific quantiles for a vector, matrix, or data frame
interp.quantiles Find the interpolated sample median, quartiles, or specific quantiles for a vector, matrix, or data frame
interp.quart Find the interpolated sample median, quartiles, or specific quantiles for a vector, matrix, or data frame
interp.quartiles Find the interpolated sample median, quartiles, or specific quantiles for a vector, matrix, or data frame
interp.values Find the interpolated sample median, quartiles, or specific quantiles for a vector, matrix, or data frame
iqitems 14 multiple choice IQ items
irt.0p Item Response Theory estimate of theta (ability) using a Rasch (like) model
irt.1p Item Response Theory estimate of theta (ability) using a Rasch (like) model
irt.2p Item Response Theory estimate of theta (ability) using a Rasch (like) model
irt.discrim Simple function to estimate item difficulties using IRT concepts
irt.item.diff.rasch Simple function to estimate item difficulties using IRT concepts
irt.person.rasch Item Response Theory estimate of theta (ability) using a Rasch (like) model
item.dichot Generate simulated data structures for circumplex or simple structure
item.sim Generate simulated data structures for circumplex or simple structure

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kurtosi Kurtosis of a vector, matrix, or data frame

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make.hierarchical Create a population or sample correlation matrix with hierachical structure.
mat.regress Multiple Regression from matrix input
multi.hist Multiple histograms with density and normal fits on one page

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omega Calculate the omega estimate of factor saturation
omega.graph Graph hierarchical factor structures

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p.ellipse SPLOM, histograms and correlations for a data matrix
p.rep Find the probability of replication for an F, t, or r and estimate effect size
paired.r Test the difference between (un)paired correlations
pairs.panels SPLOM, histograms and correlations for a data matrix
panel.cor SPLOM, histograms and correlations for a data matrix
panel.ellipse SPLOM, histograms and correlations for a data matrix
panel.hist SPLOM, histograms and correlations for a data matrix
panel.lm SPLOM, histograms and correlations for a data matrix
panel.smoothie SPLOM, histograms and correlations for a data matrix
peas Galton's Peas
phi Find the phi coefficient of correlation between two dichotomous variables
phi.demo Create demo data for psychometrics
phi2poly Convert a phi coefficient to a polychoric correlation
phi2poly.matrix Phi or Yule coefficient matrix to polychoric coefficient matrix
polar Convert Cartesian factor loadings into polar coordinates
poly.mat Find polychoric correlations of item data
polychor.matrix Phi or Yule coefficient matrix to polychoric coefficient matrix
principal Principal components analysis
psych A package for personality, psychometric, and psychological research

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r.con Fisher r to z and z to r and confidence intervals
r.test Tests of significance for correlations
r2t Fisher r to z and z to r and confidence intervals
read.clipboard shortcut for reading from the clipboard
rescale Function to convert scores to “conventional " metrics

-- S --

sat.act 3 Measures of ability: SATV, SATQ, ACT
schmid Apply the Schmid Leiman transformation to a correlation matrix
score.alpha Score scales and find Cronbach's alpha as well as associated statistics
score.items Score item composite scales and find Cronbach's alpha as well as associated statistics
score.multiple.choice Score multiple choice items and provide basic test statistics
skew Calculate skew for a vector, matrix, or data.frame

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table2df Convert a table with counts to a matrix or data.frame representing those counts.
table2matrix Convert a table with counts to a matrix or data.frame representing those counts.
test.psych Testing of functions in the psych package

-- V --

VSS Apply the Very Simple Structure criterion to determine the appropriate number of factors.
VSS.parallel Compare real and random VSS solutions
VSS.plot Plot VSS fits
VSS.scree Plot a scree test
VSS.simulate create VSS like data

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winsor Find the Winsorized mean for a vector, matrix, or data.frame

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Yule From a two by two table, find the Yule coefficient, convert to phi, or polychoric, recreate table the table to create the Yule coefficient.
Yule2phi From a two by two table, find the Yule coefficient, convert to phi, or polychoric, recreate table the table to create the Yule coefficient.
Yule2phi.matrix Phi or Yule coefficient matrix to polychoric coefficient matrix
Yule2poly From a two by two table, find the Yule coefficient, convert to phi, or polychoric, recreate table the table to create the Yule coefficient.
Yule2poly.matrix Phi or Yule coefficient matrix to polychoric coefficient matrix