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mirt (version 0.2.1)

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 exploratory and confirmatory item response models which may include polynomial or product constructed factors, and partially-compensatory item response modeling in conjunction with other IRT models.

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Install

install.packages('mirt')

Monthly Downloads

7,762

Version

0.2.1

License

GPL (>= 2)

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Maintainer

Phil Chalmers

Last Published

April 6th, 2012

Functions in mirt (0.2.1)

mirtClass-class

Class "mirtClass"
bfactor

Full-Information Item Bifactor Analysis
confmirt.model

Specify confirmatory loadings
logLik

Monte Carlo Log-Likelihood Calculation
mirt-package

Full information maximum likelihood estimation of IRT models.
polymirt

Full-Information Item Factor Analysis for Mixed Data Formats
bfactorClass-class

Class "bfactorClass"
SAT12

Description of SAT12 data
polymirtClass-class

Class "polymirtClass"
confmirt

Confirmatory Full-Information Item Factor Analysis for Mixed Data Formats
mirt

Full-Information Item Factor Analysis (Multidimensional Item Response Theory)
LSAT7

Description of LSAT7 data
Science

Description of Science data
expand.table

Expand summary table of patterns and frequencies
confmirtClass-class

Class "confmirtClass"
itemplot

Displays item surface and information plots
simdata

Simulate response patterns from an underlying multivariate normal distribution
key2binary

Convert response patterns to binary data
fscores

Methods for Function fscores