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diffIRT  

Diffusion IRT Models for Response and Response Time Data
View on CRAN: Click here


Download and install diffIRT package within the R console
Install from CRAN:
install.packages("diffIRT")

Install from Github:
library("remotes")
install_github("cran/diffIRT")

Install by package version:
library("remotes")
install_version("diffIRT", "1.5")



Attach the package and use:
library("diffIRT")
Maintained by
Dylan Molenaar
[Scholar Profile | Author Map]
All associated links for this package
First Published: 2013-11-05
Latest Update: 2015-08-14
Description:
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.
How to cite:
Dylan Molenaar (2013). diffIRT: Diffusion IRT Models for Response and Response Time Data. R package version 1.5, https://cran.r-project.org/web/packages/diffIRT. Accessed 06 Aug. 2026.
Previous versions and publish date:
(2026-07-09 07:32), 1.2 (2013-11-05 15:57), 1.4 (2014-06-05 15:58)
Other packages that cited diffIRT R package
View diffIRT citation profile
Other R packages that diffIRT depends, imports, suggests or enhances
Complete documentation for diffIRT
Functions, R codes and Examples using the diffIRT R package
Some associated functions: QQdiff . RespFit . anova . brightness . coef . diffIRT . extraversion . factest . rotation . simdiff . simdiffT . summary . 
Some associated R codes: Full diffIRT package functions and examples
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