| 00.psych-package | A package for personality, psychometric, and psychological... |
| alpha | Find two estimates of reliability: Cronbach's alpha and... |
| anova.psych | Model comparison for regression, mediation, cluster and... |
| AUC | Decision Theory measures of specificity, sensitivity, and d... |
| bassAckward | The Bass-Ackward factoring algorithm discussed by Goldberg |
| best.scales | A bootstrap aggregation function for choosing most predictive... |
| bfi | 25 Personality items representing 5 factors |
| bi.bars | Draw pairs of bargraphs based on two groups |
| bifactor | Seven data sets showing a bifactor solution. |
| bigCor | Find large correlation matrices by stitching together smaller... |
| biplot.psych | Draw biplots of factor or component scores by factor or... |
| block.random | Create a block randomized structure for n independent... |
| bock.table | Bock and Liberman (1970) data set of 1000 observations of the... |
| cattell | 12 cognitive variables from Cattell (1963) |
| circ.tests | Apply four tests of circumplex versus simple structure |
| cluster2keys | Convert a cluster vector (from e.g., kmeans) to a keys matrix... |
| cluster.cor | Find correlations of composite variables (corrected for... |
| cluster.fit | cluster Fit: fit of the cluster model to a correlation matrix |
| cluster.loadings | Find item by cluster correlations, corrected for overlap and... |
| cluster.plot | Plot factor/cluster loadings and assign items to clusters by... |
| cohen.d | Find Cohen d and confidence intervals |
| comorbidity | Convert base rates of two diagnoses and their comorbidity... |
| congruence | Matrix and profile congruences and distances |
| cor2dist | Convert correlations to distances (necessary to do... |
| cor.ci | Bootstrapped and normal confidence intervals for raw and... |
| corFiml | Find a Full Information Maximum Likelihood (FIML) correlation... |
| cor.plot | Create an image plot for a correlation or factor matrix |
| correct.cor | Find dis-attenuated correlations given correlations and... |
| corr.test | Find the correlations, sample sizes, and probability values... |
| cor.smooth | Smooth a non-positive definite correlation matrix to make it... |
| cortest.bartlett | Bartlett's test that a correlation matrix is an identity... |
| cortest.mat | Chi square tests of whether a single matrix is an identity... |
| cor.wt | The sample size weighted correlation may be used in... |
| cosinor | Functions for analysis of circadian or diurnal data |
| count.pairwise | Count number of pairwise cases for a data set with missing... |
| cta | Simulate the C(ues) T(endency) A(ction) model of motivation |
| densityBy | Create a 'violin plot' or density plot of the distribution of... |
| deprecated | Deprecated Exploratory Factor analysis functions. Please use... |
| describe | Basic descriptive statistics useful for psychometrics |
| describe.by | Basic summary statistics by group |
| diagram | Helper functions for drawing path model diagrams |
| draw.tetra | Draw a correlation ellipse and two normal curves to... |
| dummy.code | Create dummy coded variables |
| dwyer | 8 cognitive variables used by Dwyer for an example. |
| eigen.loadings | Convert eigen vectors and eigen values to the more normal... |
| 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.circles | Two way plots of means, error bars, and sample sizes |
| error.crosses | Plot x and y error bars |
| error.dots | Show a dot.chart with error bars for different groups or... |
| esem | Perform and Exploratory Structural Equation Model (ESEM) by... |
| fa | Exploratory Factor analysis using MinRes (minimum residual)... |
| faCor | Correlations between two factor analysis solutions |
| factor2cluster | Extract cluster definitions from factor loadings |
| factor.congruence | Coefficient of factor congruence |
| factor.fit | How well does the factor model fit a correlation matrix. Part... |
| factor.model | Find R = F F' + U2 is the basic factor model |
| factor.residuals | R* = R- F F' |
| factor.rotate | "Hand" rotate a factor loading matrix |
| factor.scores | Various ways to estimate factor scores for the factor... |
| factor.stats | Find various goodness of fit statistics for factor analysis... |
| fa.diagram | Graph factor loading matrices |
| fa.extension | Apply Dwyer's factor extension to find factor loadings for... |
| fa.lookup | A set of functions for factorial and empirical scale... |
| faMulti | Multi level (hierarchical) factor analysis |
| fa.parallel | Scree plots of data or correlation matrix compared to random... |
| fa.random | A first approximation to Random Effects Exploratory Factor... |
| faRotate | Multiple rotations of factor loadings to find local minima |
| fa.sort | Sort factor analysis or principal components analysis... |
| fisherz | Transformations of r, d, and t including Fisher r to z and z... |
| fparse | Parse and exten formula input from a model and return the DV,... |
| Garcia | Data from the sexism (protest) study of Garcia, Schmitt,... |
| geometric.mean | Find the geometric mean of a vector or columns of a... |
| glb.algebraic | Find the greatest lower bound to reliability. |
| Gleser | Example data from Gleser, Cronbach and Rajaratnam (1965) to... |
| Gorsuch | Example data set from Gorsuch (1997) for an example factor... |
| guttman | Alternative estimates of test reliabiity |
| Harman | Five data sets from Harman (1967). 9 cognitive variables from... |
| harmonic.mean | Find the harmonic mean of a vector, matrix, or columns of a... |
| headtail | Combine calls to head and tail |
| ICC | Intraclass Correlations (ICC1, ICC2, ICC3 from Shrout and... |
| ICLUST | iclust: Item Cluster Analysis - Hierarchical cluster analysis... |
| ICLUST.cluster | Function to form hierarchical cluster analysis of items |
| iclust.diagram | Draw an ICLUST hierarchical cluster structure diagram |
| 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.median | Find the interpolated sample median, quartiles, or specific... |
| irt.fa | Item Response Analysis by Exploratory Factor Analysis of... |
| irt.item.diff.rasch | Simple function to estimate item difficulties using IRT... |
| irt.person.rasch | Item Response Theory estimate of theta (ability) using a... |
| irt.responses | Plot probability of multiple choice responses as a function... |
| kaiser | Apply the Kaiser normalization when rotating factors |
| kappa | Find Cohen's kappa and weighted kappa coefficients for... |
| KMO | Find the Kaiser, Meyer, Olkin Measure of Sampling Adequacy |
| lmCor | Multiple Regression, Canonical and Set Correlation from... |
| logistic | Logistic transform from x to p and logit transform from p to... |
| lowerUpper | Combine two square matrices to have a lower off diagonal for... |
| make.keys | Create a keys matrix for use by score.items or cluster.cor |
| manhattan | "Manhattan" plots of correlations with a set of criteria. |
| matrix.addition | A function to add two vectors or matrices |
| mat.sort | Sort the elements of a correlation matrix to reflect factor... |
| mediate | Estimate and display direct and indirect effects of mediators... |
| misc | Miscellaneous helper functions for the psych package |
| mixed.cor | Find correlations for mixtures of continuous, polytomous, and... |
| mssd | Find von Neuman's Mean Square of Successive Differences |
| multi.hist | Multiple histograms with density and normal fits on one page |
| multilevel.reliability | Find and plot various reliability/gneralizability... |
| omega | Calculate McDonald's omega estimates of general and total... |
| omega.graph | Graph hierarchical factor structures |
| outlier | Find and graph Mahalanobis squared distances to detect... |
| paired.r | Test the difference between (un)paired correlations |
| pairs.panels | SPLOM, histograms and correlations for a data matrix |
| parcels | Find miniscales (parcels) of size 2 or 3 from a set of items |
| partial.r | Find the partial correlations for a set (x) of variables with... |
| phi | Find the phi coefficient of correlation between two... |
| phi2poly | Convert a phi coefficient to a tetrachoric correlation |
| phi.demo | A simple demonstration of the Pearson, phi, and polychoric... |
| Pinv | Compute the Moore-Penrose Pseudo Inverse of a matrix |
| plot.psych | Plotting functions for the psych package of class "psych" |
| polar | Convert Cartesian factor loadings into polar coordinates |
| polychor.matrix | Phi or Yule coefficient matrix to polychoric coefficient... |
| predicted.validity | Find the predicted validities of a set of scales based on... |
| predict.psych | Prediction function for factor analysis, principal components... |
| p.rep | Find the probability of replication for an F, t, or r and... |
| principal | Principal components analysis (PCA) |
| print.psych | Print and summary functions for the psych class |
| Promax | Perform Procustes,bifactor, promax or targeted rotations and... |
| range.correction | Correct correlations for restriction of range. (Thorndike... |
| reliability | Reports 7 different estimates of scale reliabity including... |
| rescale | Function to convert scores to "conventional " metrics |
| residuals.psych | Extract residuals from various psych objects |
| reverse.code | Reverse the coding of selected items prior to scale analysis |
| RMSEA | Root Mean Squared Error of Approximation from chisq, df, and... |
| r.test | Tests of significance for correlations |
| RV | Three measures of the correlations between sets of variables |
| sat.act | 3 Measures of ability: SATV, SATQ, ACT |
| scaling.fits | Test the adequacy of simple choice, logistic, or Thurstonian... |
| scatter.hist | Draw a scatter plot with associated X and Y histograms,... |
| schmid | Apply the Schmid Leiman transformation to a correlation... |
| Schmid.Leiman | 12 variables created by Schmid and Leiman to show the... |
| score.alpha | Score scales and find Cronbach's alpha as well as associated... |
| score.irt | Find Item Response Theory (IRT) based scores for dichotomous... |
| score.items | Score item composite scales and find Cronbach's alpha,... |
| score.multiple.choice | Score multiple choice items and provide basic test statistics |
| scoreWtd | Score items using regression or correlation based weights |
| scrub | A utility for basic data cleaning and recoding. Changes... |
| SD | Find the Standard deviation for a vector, matrix, or... |
| sim | Functions to simulate psychological/psychometric data. |
| sim.anova | Simulate a 3 way balanced ANOVA or linear model, with or... |
| sim.congeneric | Simulate a congeneric data set with or without minor factors |
| sim.hierarchical | Create a population or sample correlation matrix, perhaps... |
| sim.irt | Functions to simulate psychological/psychometric data. |
| sim.item | Generate simulated data structures for circumplex, spherical,... |
| sim.multilevel | Simulate multilevel data with specified within group and... |
| sim.omega | Further functions to simulate psychological/psychometric... |
| sim.structural | Create correlation matrices or data matrices with a... |
| simulation.circ | Simulations of circumplex and simple structure |
| sim.VSS | create VSS like data |
| skew | Calculate univariate or multivariate (Mardia's test) skew and... |
| small.msq | A small example data set taken from a larger data set |
| smc | Find the Squared Multiple Correlation (SMC) of each variable... |
| spider | Make "radar" or "spider" plots. |
| statsBy | Find statistics (including correlations) within and between... |
| structure.diagram | Draw a structural equation model specified by two measurement... |
| structure.list | Create factor model matrices from an input list |
| super.matrix | Form a super matrix from two sub matrices. |
| table2matrix | Convert a table with counts to a matrix or data.frame... |
| tal_or | Data set testing causal direction in presumed media influence |
| test.irt | A simple demonstration (and test) of various IRT scoring... |
| test.psych | Testing of functions in the psych package |
| testRetest | Find various test-retest statistics, including test, person... |
| tetrachor | Tetrachoric, polychoric, biserial and polyserial correlations... |
| thurstone | Thurstone Case V scaling |
| tr | Find the trace of a square matrix |
| Tucker | 9 Cognitive variables discussed by Tucker and Lewis (1973) |
| unidim | Several indices of the unidimensionality of a set of... |
| VSS | Apply the Very Simple Structure, MAP, and other criteria to... |
| VSS.parallel | Compare real and random VSS solutions |
| VSS.plot | Plot VSS fits |
| VSS.scree | Plot the successive eigen values for a scree test |
| winsor | Find the Winsorized scores, means, sds or variances for a... |
| withinBetween | An example of the distinction between within group and... |
| Yule | From a two by two table, find the Yule coefficients of... |
