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mirt (version 0.2.3)

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

11,947

Version

0.2.3

License

GPL (>= 2)

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Maintainer

Phil Chalmers

Last Published

May 2nd, 2012

Functions in mirt (0.2.3)

mirt

Full-Information Item Factor Analysis (Multidimensional Item Response Theory)
key2binary

Convert response patterns to binary data
bfactorClass-class

Class "bfactorClass"
Science

Description of Science data
LSAT7

Description of LSAT7 data
expand.table

Expand summary table of patterns and frequencies
polymirtClass-class

Class "polymirtClass"
confmirt

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

Full-Information Item Bifactor Analysis
mirt-package

Full information maximum likelihood estimation of IRT models.
confmirtClass-class

Class "confmirtClass"
fscores

Methods for Function fscores
polymirt

Full-Information Item Factor Analysis for Mixed Data Formats
itemplot

Displays item surface and information plots
read.mirt

Translate mirt parameters for plink package
simdata

Simulate response patterns from an underlying multivariate normal distribution
confmirt.model

Specify confirmatory loadings
logLik

Monte Carlo Log-Likelihood Calculation
SAT12

Description of SAT12 data
mirtClass-class

Class "mirtClass"