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irtoys (version 0.1.7)

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

864

Version

0.1.7

License

GPL (>= 2)

Maintainer

Ivailo Partchev

Last Published

January 22nd, 2014

Functions in irtoys (0.1.7)

Binary (true/false) responses to a test

Maximum likelihood and Bayes Modal estimation of ability

Read in parameter estimates

True scores with standard errors

EAP estimation of ability

Estimate item parameters

Item response function

Example item parameters

The Z3 appropriateness index

Non-parametric characteristic curves

Test response function

A plot method for test response functions

Estimate and plot IRT models for binary responses

Non-parametric option curves

Read in quadrature

Quantiles of the ranked sum scores

Bias-corrected (Warm's) estimates of ability

Original, unscored multiple-choice responses to a test

Elementary test-item analysis

Test information function

A plot method for test information functions

Read responses from a file

Simulate response data

Score a multiple choice test

Item information function

Plot observed and predicted scores against ability

Draw plausible values

Normal quadrature points and weights

A plot method for item response functions

A plot method for item information functions

Linear transformation of the IRT scale

Read in parameter estimates

Approximate tetrachoric correlation matrix