A Collection of Functions Related to Item Response Theory (IRT)

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Documentation for package ‘irtoys’ version 0.2.2

• DESCRIPTION file.
• User guides, package vignettes and other documentation.
• Package NEWS.

Help Pages

irtoys-package	Estimate and plot IRT models for binary responses
ability	Estimate ability
api	The api appropriateness index
b1	Example item parameters 1PL (Bilog)
b2	Example item parameters 2PL (Bilog)
b3	Example item parameters 3PL (Bilog)
dpv	Draw plausible values
eap	EAP estimation of ability
erf	Plot empirical response function
est	Estimate item parameters
iif	Item information function
interactionModel	Interaction model
irf	Item response function
irfPlot	Item fit plot
irtoys	Estimate and plot IRT models for binary responses
itf	Test item fit
mlebme	Maximum likelihood and Bayes Modal estimation of ability
normal.qu	Normal quadrature points and weights
npp	Non-parametric characteristic curves
plot.iif	A plot method for item information functions
plot.imp	A plot method for the interaction model
plot.irf	A plot method for item response functions
plot.tif	A plot method for test information functions
plot.trf	A plot method for test response functions
qrs	Quantiles of the ranked sum scores
read.ip.bilog	Read in parameter estimates
read.ip.icl	Read in parameter estimates
read.qu.icl	Read in quadrature
read.resp	Read responses from a file
rim	Item-total regressions for the Rasch vs. the interaction model
sca	Linear transformation of the IRT scale
sco	Score a multiple choice test
Scored	Binary (true/false) responses to a test
Scored2pl	Example item parameters
scoreMetric	Sum score metric
scp	Plot observed and predicted scores against ability
sim	Simulate response data
tet	Approximate tetchoric correlation matrix
tgf	Non-parametric option curves
tia	Elementary test-item analysis
tif	Test information function
trf	Test response function
tsc	True scores with standard errors
Unscored	Original, unscored multiple-choice responses to a test
wle	Bias-corrected (Warm's) estimates of ability