diffIRT: Diffusion IRT Models for Response and Response Time Data
Version 1.5

Package to fit diffusion-based IRT models to response and response time data. Models are fit using marginal maximum likelihood. Parameter restrictions (fixed value and equality constraints) are possible. In addition, factor scores (person drift rate and person boundary separation) can be estimated. Model fit assessment tools are also available. The traditional diffusion model can be estimated as well.

AuthorDylan Molenaar
Date of publication2015-08-14 00:20:21
MaintainerDylan Molenaar <d.molenaar@uva.nl>
LicenseGPL-2
Version1.5
Package repositoryView on CRAN
InstallationInstall the latest version of this package by entering the following in R:
install.packages("diffIRT")

Popular man pages

anova: Conduct a likelihood ratio test on two nested 'diffIRT'...
coef: Return estimated parameters
diffIRT: Fitting diffusion IRT models
factest: Estimating factor scores for diffIRT models
rotation: Responses and Response Times to 10 Mental Rotation Items
simdiff: Simulate data according to the D-diffusion or Q-diffusion IRT...
summary: Summary function for diffIRT objects
See all...

All man pages Function index File listing

Man pages

anova: Conduct a likelihood ratio test on two nested 'diffIRT'...
brightness: A Simulated Response Time Dataset according to an...
coef: Return estimated parameters
diffIRT: Fitting diffusion IRT models
extraversion: Responses and Response Times to 10 Extraversion Items
factest: Estimating factor scores for diffIRT models
QQdiff: Assessing diffIRT model fit for the response times using...
RespFit: Assessing diffIRT model fit for the responses using limited...
rotation: Responses and Response Times to 10 Mental Rotation Items
simdiff: Simulate data according to the D-diffusion or Q-diffusion IRT...
simdiffT: Simulate data according to the traditional diffusion model.
summary: Summary function for diffIRT objects

Functions

Files

inst
inst/CITATION
src
src/diffIRT.c
NAMESPACE
data
data/brightness.rda
data/rotation.rda
data/extraversion.rda
R
R/coef.diffIRT.r
R/mdiffIRT.r
R/fitObs.r
R/logLik.diffIRT.r
R/fitCumChoose.r
R/qdiffIRT.r
R/anova.diffIRT.r
R/likelihood.r
R/RespFit.r
R/fitOrders.r
R/simdiffT.r
R/calcSubjLL.r
R/calcEZ.r
R/print.diffIRT.r
R/nobs.diffIRT.r
R/print.RespFit.r
R/vcov.diffIRT.r
R/summary.diffIRT.r
R/QQdiff.r
R/fitDeriv.r
R/LLscoreVd.r
R/fitItems.r
R/get.start.r
R/fitPred.r
R/deriv.r
R/simdiff.r
R/diffIRT.r
R/LLscoreA.r
R/LLscoreVq.r
R/summary.RespFit.r
R/pdiffIRT.r
R/factest.r
MD5
DESCRIPTION
man
man/diffIRT.Rd
man/anova.Rd
man/QQdiff.Rd
man/brightness.Rd
man/RespFit.Rd
man/extraversion.Rd
man/factest.Rd
man/simdiffT.Rd
man/rotation.Rd
man/coef.Rd
man/summary.Rd
man/simdiff.Rd
diffIRT documentation built on May 19, 2017, 3:44 p.m.

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

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