diffIRT: Diffusion IRT Models for Response and Response Time Data

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.

Author
Dylan Molenaar
Date of publication
2015-08-14 00:20:21
Maintainer
Dylan Molenaar <d.molenaar@uva.nl>
License
GPL-2
Version
1.5

View on CRAN

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

Files in this package

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