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

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A collection of functions useful in learning and practicing IRT, which can be combined into larger programs. Provides basic CTT analysis, 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), ability estimation (MLE, BME, EAP, WLE, plausible values), item and person fit statistics, scaling methods (MM, MS, Stocking-Lord, and the complete Hebaera method), and a rich array of parametric and non-parametric (kernel) plots. Estimates and plots Haberman's interaction model when all items are dichotomously scored.

Author
Ivailo Partchev
Date of publication
2016-10-10 13:51:54
Maintainer
Ivailo Partchev <partchev@gmail.com>
License
GPL (>= 2)
Version
0.2.0

View on CRAN

Man pages

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-package
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...
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

Files in this package

irtoys
irtoys/inst
irtoys/inst/doc
irtoys/inst/doc/irtoys-vignette.R
irtoys/inst/doc/irtoys-vignette.Rmd
irtoys/inst/doc/irtoys-vignette.html
irtoys/src
irtoys/src/interaction.c
irtoys/src/interaction.h
irtoys/NAMESPACE
irtoys/NEWS
irtoys/data
irtoys/data/b3.RData
irtoys/data/b2.RData
irtoys/data/Scored2pl.RData
irtoys/data/b1.RData
irtoys/data/Scored.RData
irtoys/data/Unscored.RData
irtoys/R
irtoys/R/nonpar.R
irtoys/R/scale.R
irtoys/R/utils.R
irtoys/R/tracelines.R
irtoys/R/ability.R
irtoys/R/itemfit.R
irtoys/R/readin.R
irtoys/R/estimate.R
irtoys/R/irtoys-package.R
irtoys/R/interaction.R
irtoys/vignettes
irtoys/vignettes/irtoys-vignette_cache
irtoys/vignettes/irtoys-vignette_cache/html
irtoys/vignettes/irtoys-vignette_cache/html/unnamed-chunk-2_274a24304e67b345667878d6dd433355.rdb
irtoys/vignettes/irtoys-vignette_cache/html/unnamed-chunk-2_274a24304e67b345667878d6dd433355.rdx
irtoys/vignettes/irtoys-vignette_cache/html/__packages
irtoys/vignettes/irtoys-vignette_cache/html/unnamed-chunk-2_274a24304e67b345667878d6dd433355.RData
irtoys/vignettes/irtoys.bib
irtoys/vignettes/irtoys-vignette.Rmd
irtoys/MD5
irtoys/build
irtoys/build/vignette.rds
irtoys/DESCRIPTION
irtoys/man
irtoys/man/est.Rd
irtoys/man/read.ip.bilog.Rd
irtoys/man/interactionModel.Rd
irtoys/man/plot.irf.Rd
irtoys/man/rim.Rd
irtoys/man/Scored2pl.Rd
irtoys/man/b1.Rd
irtoys/man/read.resp.Rd
irtoys/man/b3.Rd
irtoys/man/irf.Rd
irtoys/man/dpv.Rd
irtoys/man/api.Rd
irtoys/man/tia.Rd
irtoys/man/tgf.Rd
irtoys/man/scp.Rd
irtoys/man/tet.Rd
irtoys/man/irtoys-package.Rd
irtoys/man/mlebme.Rd
irtoys/man/scoreMetric.Rd
irtoys/man/tif.Rd
irtoys/man/read.qu.icl.Rd
irtoys/man/tsc.Rd
irtoys/man/qrs.Rd
irtoys/man/sca.Rd
irtoys/man/read.ip.icl.Rd
irtoys/man/eap.Rd
irtoys/man/iif.Rd
irtoys/man/irfPlot.Rd
irtoys/man/trf.Rd
irtoys/man/plot.imp.Rd
irtoys/man/itf.Rd
irtoys/man/Scored.Rd
irtoys/man/sco.Rd
irtoys/man/npp.Rd
irtoys/man/b2.Rd
irtoys/man/normal.qu.Rd
irtoys/man/ability.Rd
irtoys/man/wle.Rd
irtoys/man/plot.tif.Rd
irtoys/man/Unscored.Rd
irtoys/man/erf.Rd
irtoys/man/plot.iif.Rd
irtoys/man/sim.Rd
irtoys/man/plot.trf.Rd