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

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

## 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