# psych v1.0-42

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## Procedures for Personality and Psychological Research

A number of routines for personality, psychometrics and experimental
psychology. Functions are primarily for scale construction, cluster analysis and
reliability analysis, although others provide basic descriptive
statistics. For more information, see the personality-project.org/r.

## Functions in psych

Name | Description | |

headtail | Combine calls to head and tail | |

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. | |

omega.graph | Graph hierarchical factor structures | |

phi.demo | Create demo data for psychometrics | |

psych | A package for personality, psychometric, and psychological research | |

ICLUST.sort | Sort items by absolute size of cluster loadings | |

ICLUST.cluster | Function to form hierarchical cluster analysis of items | |

score.items | Score item composite scales and find Cronbach's alpha as well as associated statistics | |

galton | Galton's Mid parent child height data | |

VSS.scree | Plot a scree test | |

VSS | Apply the Very Simple Structure criterion to determine the appropriate number of factors. | |

ellipses | Plot data and 1 and 2 sigma correlation ellipses | |

circ.simulation | Simulations of circumplex and simple structure | |

error.bars.by | Plot means and confidence intervals for multiple groups | |

circ.tests | Apply four tests of circumplex versus simple structure | |

paired.r | Test the difference between (un)paired correlations | |

mat.regress | Multiple Regression from matrix input | |

ICLUST.graph | create control code for ICLUST graphical output | |

bfi | 25 Personality items representing 5 factors | |

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

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

correct.cor | Find dis-attenuated correlations and give alpha reliabilities | |

ICLUST.rgraph | Draw an ICLUST graph using the Rgraphviz package | |

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

error.crosses | Plot x and y error bars | |

omega | Calculate the omega estimate of factor saturation | |

VSS.plot | Plot VSS fits | |

VSS.simulate | create VSS like data | |

ICLUST | ICLUST: Item Cluster Analysis -- Hierarchical cluster analysis using psychometric principles | |

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

read.clipboard | shortcut for reading from the clipboard | |

VSS.parallel | Compare real and random VSS solutions | |

fa.graph | Graph factor loading matrices | |

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

irt.1p | Item Response Theory estimate of theta (ability) using a Rasch (like) model | |

phi | Find the phi coefficient of correlation between two dichotomous variables | |

factor.congruence | Coefficient of factor congruence | |

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

schmid | Apply the Schmid Leiman transformation to a correlation matrix | |

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

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

cluster.loadings | Find item by cluster correlations, corrected for overlap and reliability | |

alpha.scale | Cronbach alpha for a scale | |

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

item.sim | Generate simulated data structures for circumplex or simple structure | |

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

error.bars | Plot means and confidence intervals | |

factor.rotate | ``Hand" rotate a factor loading matrix | |

fisherz | Fisher r to z and z to r and confidence intervals | |

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

factor2cluster | Extract cluster definitions from factor loadings | |

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

describe | Basic descriptive statistics useful for psychometrics | |

factor.pa | Principal Axis Factor Analysis | |

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

cluster.cor | Find correlations of composite variables from a larger matrix | |

polar | Convert Cartesian factor loadings into polar coordinates | |

factor.residuals | R* = R- F F' | |

polychor.matrix | Phi or Yule coefficient matrix to polychoric coefficient matrix | |

sat.act | 3 Measures of ability: SATV, SATQ, ACT | |

peas | Galton`s Peas | |

phi2poly | Convert a phi coefficient to a polychoric correlation | |

multi.hist | Multiple histograms with density and normal fits on one page | |

irt.item.diff.rasch | Simple function to estimate item difficulties using IRT concepts | |

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

make.hierarchical | Create a population or sample correlation matrix with hierachical structure. | |

r.test | Tests of significance for correlations | |

poly.mat | Find polychoric correlations of item data | |

matrix.addition | A function to add two vectors or matrices | |

score.multiple.choice | Score multiple choice items and provide basic test statistics | |

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

table2matrix | Convert a table with counts to a matrix or data.frame representing those counts. | |

iqitems | 14 multiple choice IQ items | |

principal | Principal components analysis | |

test.psych | Testing of functions in the psych package | |

kurtosi | Kurtosis of a vector, matrix, or data frame | |

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

congeneric.sim | Simulate a congeneric data set | |

describe.by | Basic summary statistics by group | |

pairs.panels | SPLOM, histograms and correlations for a data matrix | |

rescale | Function to convert scores to ``conventional " metrics | |

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## Last month downloads

## Details

Date | 2008-3-21 |

License | GPL version 2 or newer |

URL | http://personality-project.org/r, http://personality-project.org/r/psych.manual.pdf |

Packaged | Mon Mar 24 22:29:34 2008; hornik |

suggests | GPArotation , MASS , polycor , Rgraphviz |

Contributors | William Revelle |

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