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

Functions

ability Man page
api Man page
b1 Man page
b2 Man page
b3 Man page
dpv Man page
eap Man page
erf Man page
est Man page
iif Man page
interactionModel Man page
irf Man page
irfPlot Man page
irtoys Man page
irtoys-package Man page
itf Man page
mlebme Man page
normal.qu Man page
npp Man page
plot.iif Man page
plot.imp Man page
plot.irf Man page
plot.tif Man page
plot.trf Man page
qrs Man page
read.ip.bilog Man page
read.ip.icl Man page
read.qu.icl Man page
read.resp Man page
rim Man page
sca Man page
sco Man page
Scored Man page
Scored2pl Man page
scoreMetric Man page
scp Man page
sim Man page
tet Man page
tgf Man page
tia Man page
tif Man page
trf Man page
tsc Man page
Unscored Man page
wle Man page

Files

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

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