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

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.

AuthorIvailo Partchev
Date of publication2016-10-10 13:51:54
MaintainerIvailo Partchev <partchev@gmail.com>
LicenseGPL (>= 2)
Version0.2.0

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

Questions? Problems? Suggestions? or email at ian@mutexlabs.com.

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