sirtSupplementary Item Response Theory ModelsIf you use sirt and have suggestions for improvement or have found bugs, please email me at robitzsch@ipn.uni-kiel.de.ManualThe manual may be found here https://alexanderrobitzsch.github.io/sirt/CRAN versionThe official version of sirt is hosted on CRAN and may be found here. The CRAN version can be installed from within R using:utils::install.packages("sirt")GitHub versionThe version hosted here is the development version of sirt. The GitHub version can be installed using devtools as:devtools::install_github("alexanderrobitzsch/sirt")