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 fitted 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.

Version: 1.4
Depends: statmod
Published: 2014-06-05
Author: Dylan Molenaar
Maintainer: Dylan Molenaar <d.molenaar at uva.nl>
License: GPL-2
NeedsCompilation: yes
CRAN checks: diffIRT results


Reference manual: diffIRT.pdf
Package source: diffIRT_1.4.tar.gz
Windows binaries: r-devel: diffIRT_1.4.zip, r-release: diffIRT_1.4.zip, r-oldrel: diffIRT_1.4.zip
OS X Snow Leopard binaries: r-release: diffIRT_1.4.tgz, r-oldrel: diffIRT_1.4.tgz
OS X Mavericks binaries: r-release: diffIRT_1.4.tgz
Old sources: diffIRT archive