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irtoys (version 0.1.2)

Simple interface to the estimation and plotting of IRT models

Description

Provides a simple common interface to the estimation of item parameters in IRT models for binary responses with three different programs (ICL, BILOG-MG, and ltm, and a variety of functions useful with IRT models.

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Version

Install

install.packages('irtoys')

Monthly Downloads

690

Version

0.1.2

License

GPL (>= 2)

Maintainer

Ivailo Partchev

Last Published

October 12th, 2009

Functions in irtoys (0.1.2)

A plot method for item information functions

A plot method for test information functions

Normal quadrature points and weights

Item response function

Simulate response data

A plot method for item response functions

Read in quadrature

Read in parameter estimates

Draw plausible values

Read responses from a file

The Z3 appropriateness index

Maximum likelihood and Bayes Modal estimation of ability

Binary (true/false) responses to a test

Non-parametric characteristic curves

True scores with standard errors

Non-parametric option curves

A plot method for test response functions

Transform a list of lists... to a matrix

Internal functions

Linear transformation of the IRT scale

Original, unscored multiple-choice responses to a test

Read in parameter estimates

Item information function

Estimate item parameters

Estimate and plot IRT models bor binary responses

EAP estimation of ability

Bin the latent variable estimates

Quantiles of the ranked sum scores

Test response function

Score a multiple choice test

Test information function