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irtoys (version 0.1.4)

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

0.1.4

License

GPL (>= 2)

Maintainer

Ivailo Partchev

Last Published

June 23rd, 2011

Functions in irtoys (0.1.4)

Unscored

Original, unscored multiple-choice responses to a test
normal.qu

Normal quadrature points and weights
eap

EAP estimation of ability
sco

Score a multiple choice test
itf

Test item fit
tif

Test information function
mlebme

Maximum likelihood and Bayes Modal estimation of ability
read.ip.icl

Read in parameter estimates
npp

Non-parametric characteristic curves
read.qu.icl

Read in quadrature
wle

Bias-corrected (Warm's) estimates of ability
trf

Test response function
irf

Item response function
sca

Linear transformation of the IRT scale
read.ip.bilog

Read in parameter estimates
plot.trf

A plot method for test response functions
grp

Bin the latent variable estimates
l2m

Transform a list of lists... to a matrix
read.resp

Read responses from a file
plot.tif

A plot method for test information functions
internal

Internal functions
Scored

Binary (true/false) responses to a test
dpv

Draw plausible values
qrs

Quantiles of the ranked sum scores
iif

Item information function
tgp

Non-parametric option curves
scp

Plot observed and predicted scores against ability
est

Estimate item parameters
api

The Z3 appropriateness index
irtoys-package

Estimate and plot IRT models bor binary responses
sim

Simulate response data
tsc

True scores with standard errors
plot.irf

A plot method for item response functions
plot.iif

A plot method for item information functions