# Procedures for Psychological, Psychometric, and Personality Research

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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

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

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 Bechtoldt Seven data sets showing a bifactor solution. Bechtoldt.1 Seven data sets showing a bifactor solution. Bechtoldt.2 Seven data sets showing a bifactor solution. bfi 25 Personality items representing 5 factors bifactor Seven data sets showing a bifactor solution.

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

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 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.minres Principal Axis and MinRes (minimum residual) Factor Analysis factor.model Find R = F F' + U2 is the basic factor model factor.pa Principal Axis and MinRes (minimum residual) Factor Analysis factor.plot Plot factor/cluster loadings and assign items to clusters by their highest loading. 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. glb Alternative estimates of test reliabiity guttman Alternative estimates of test reliabiity

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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 Holzinger Seven data sets showing a bifactor solution. Holzinger.9 Seven data sets showing a bifactor solution.

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 ICC Intraclass Correlations (ICC1, ICC2, ICC3 from Shrout and Fleiss) ICLUST ICLUST: Item Cluster Analysis - Hierarchical cluster analysis using psychometric principles 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 Calculate skew or kurtosis for a vector, matrix, or data.frame

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 make.congeneric Simulate a congeneric data set make.hierarchical Create a population or sample correlation matrix, perhaps with hierarchical structure. make.keys Create a keys matrix for use by score.items or cluster.cor make.structural Create correlation matrices or data matrices with a particular measurement and structural model MAP Apply the Very Simple Structure and MAP criteria to determine the appropriate number of factors. mat.regress Multiple Regression from matrix input matrix.addition A function to add two vectors or matrices msq 75 mood items from the Motivational State Questionnaire for 3896 participants multi.hist Multiple histograms with density and normal fits on one page

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 neo NEO correlation matrix from the NEO_PI_R manual

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 omega Calculate McDonald's omega estimates of general and total factor saturation omega.graph Graph hierarchical factor structures omega.sem 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 p.rep.f Find the probability of replication for an F, t, or r and estimate effect size p.rep.r Find the probability of replication for an F, t, or r and estimate effect size p.rep.t 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.cor.scale 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.hist.density SPLOM, histograms and correlations for a data matrix panel.lm SPLOM, histograms and correlations for a data matrix panel.lm.ellipse SPLOM, histograms and correlations for a data matrix panel.smoothie SPLOM, histograms and correlations for a data matrix partial.r Find the partial correlations for a set (x) of variables with set (y) removed. peas Galton's Peas phi Find the phi coefficient of correlation between two dichotomous variables phi.demo Create demo data for psychometrics phi.list Create factor model matrices from an input list phi2poly Convert a phi coefficient to a polychoric correlation phi2poly.matrix Phi or Yule coefficient matrix to polychoric coefficient matrix plot.psych Plotting functions for the psych package of class "psych" 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 print.psych Print and summary functions for the psych class Promax Perform promax or targeted rotations and return the inter factor angles 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 read.clipboard.csv shortcut for reading from the clipboard read.clipboard.lower shortcut for reading from the clipboard read.clipboard.upper shortcut for reading from the clipboard Reise Seven data sets showing a bifactor solution. rescale Function to convert scores to "conventional " metrics

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 sat.act 3 Measures of ability: SATV, SATQ, ACT scaling.fits Test the adequacy of simple choice, logistic, or Thurstonian scaling. 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, Guttman lambda 6 and item whole correlations score.multiple.choice Score multiple choice items and provide basic test statistics SD Find the Standard deviation for a vector, matrix, or data.frame - do not return error if there are no cases sim Functions to simulate psychological/psychometric data. sim.anova Simulate a 3 way balanced ANOVA or linear model, with or without repeated measures. sim.circ Generate simulated data structures for circumplex or simple structure sim.congeneric Simulate a congeneric data set sim.dichot Generate simulated data structures for circumplex or simple structure sim.hierarchical Create a population or sample correlation matrix, perhaps with hierarchical structure. sim.item Generate simulated data structures for circumplex or simple structure sim.structural Create correlation matrices or data matrices with a particular measurement and structural model sim.structure Create correlation matrices or data matrices with a particular measurement and structural model sim.VSS create VSS like data simulation.circ Simulations of circumplex and simple structure simulation.circ Simulations of circumplex and simple structure skew Calculate skew or kurtosis for a vector, matrix, or data.frame SMC Find the Squared Multiple Correlation (SMC) of each variable with the remaining variables in a matrix smc Find the Squared Multiple Correlation (SMC) of each variable with the remaining variables in a matrix structure.graph Draw a structural equation model specified by two measurement models and a structural model structure.list Create factor model matrices from an input list structure.sem Draw a structural equation model specified by two measurement models and a structural model summary.psych Print and summary functions for the psych class super.matrix Form a super matrix from two sub matrices.

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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. target.rot Perform promax or targeted rotations and return the inter factor angles tenberge Alternative estimates of test reliabiity test.psych Testing of functions in the psych package Thurstone Seven data sets showing a bifactor solution. thurstone Thurstone Case V scaling Thurstone.33 Seven data sets showing a bifactor solution. tr Find the trace of a square matrix

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 veg Paired comparison of preferences for 9 vegetables vegetables Paired comparison of preferences for 9 vegetables VSS Apply the Very Simple Structure and MAP criteria 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.sim create VSS like data VSS.simulate create VSS like data

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 winsor Find the Winsorized scores or means for a vector, matrix, or data.frame winsor.means Find the Winsorized scores or means for a vector, matrix, or data.frame wkappa Find Cohen's kappa and weighted kappa coefficients for correlation of two raters

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 Yule 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. Yule.inv 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. Yule2phi 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. Yule2phi.matrix Phi or Yule coefficient matrix to polychoric coefficient matrix Yule2poly 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. Yule2poly.matrix Phi or Yule coefficient matrix to polychoric coefficient matrix