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irtoys (version 0.1.5)

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

0.1.5

License

GPL (>= 2)

Maintainer

Ivailo Partchev

Last Published

July 1st, 2012

Functions in irtoys (0.1.5)

Estimate item parameters

Quantiles of the ranked sum scores

Read responses from a file

Transform a list of lists... to a matrix

Test information function

Normal quadrature points and weights

Original, unscored multiple-choice responses to a test

Bin the latent variable estimates

A plot method for item response functions

Read in parameter estimates

Linear transformation of the IRT scale

Draw plausible values

Estimate and plot IRT models bor binary responses

Plot observed and predicted scores against ability

Read in quadrature

Read in parameter estimates

Binary (true/false) responses to a test

EAP estimation of ability

The Z3 appropriateness index

Non-parametric option curves

A plot method for item information functions

Item response function

Test response function

Maximum likelihood and Bayes Modal estimation of ability

True scores with standard errors

Bias-corrected (Warm's) estimates of ability

Non-parametric characteristic curves

Simulate response data

Elementary test-item analysis

Item information function

Score a multiple choice test

A plot method for test response functions

A plot method for test information functions