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mirt (version 0.1-19)

Multidimensional Item Response Theory

Description

Analysis of dichotomous and polychotomous response data using latent trait models under the Item Response Theory paradigm. Includes the multivariate two- and three-parameter logistic models, confirmatory bifactor analysis, polytomous confirmatory and exploratory item response models, and partially-compensatory item response modeling in conjunction with other IRT models.

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Version

Install

install.packages('mirt')

Monthly Downloads

7,762

Version

0.1-19

License

GPL (>= 2)

Maintainer

Phil Chalmers

Last Published

November 24th, 2011

Functions in mirt (0.1-19)

Confirmatory Full-Information Item Factor Analysis for Mixed Data Formats

Description of SAT12 data

fscores-methods

Methods for Function fscores

bfactorClass-class

Class "bfactorClass"

Compute factor scores

itemplot-methods

Methods for Function itemplot

polymirtClass-class

Class "polymirtClass"

mirtClass-class

Class "mirtClass"

Convert response patterns to binary data

Full-Information Item Bifactor Analysis

Methods for Function logLik

Monte Carlo Log-Likelihood Calculation

Expand summary table of patterns and frequencies

Full-Information Item Factor Analysis for Mixed Data Formats

Specify confirmatory loadings

confmirtClass-class

Class "confmirtClass"

Full-Information Item Factor Analysis (Multidimensional Item Response Theory)

Description of LSAT7 data

Displays item surface and information plots

Simulate response patterns from an underlying multivariate normal distribution

Description of Science data