Supplementary Item Response Theory Models

If you use sirt and have suggestions for improvement or have found bugs, please email me at Please always provide a minimal dataset, necessary to demonstrate the problem, a minimal runnable code necessary to reproduce the issue, which can be run on the given dataset, and all necessary information on the used librarys, the R version, and the OS it is run on, perhaps a sessionInfo().


The manual may be found here

CRAN version sirt 3.12-66 (2022-05-16)


The official version of sirt is hosted on CRAN and may be found here. The CRAN version can be installed from within R using:


GitHub version sirt 3.13-24 (2022-11-28)


The version hosted here is the development version of sirt. The GitHub version can be installed using devtools as:


alexanderrobitzsch/sirt documentation built on Dec. 3, 2022, 6:18 p.m.