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If you wish to report a bug, or if you are interested in having us mirror your free-software or open-source project, please feel free to contact us at mirror[@]metanet.ch.

To cite the 'sirt' package in publications use:

Robitzsch A (2025). sirt: Supplementary Item Response Theory Models. doi:10.32614/CRAN.package.sirt, R package version 4.2-133, https://CRAN.R-project.org/package=sirt.

Corresponding BibTeX entry: 

  @Manual{sirt_4.2-133,
    title = {sirt: Supplementary Item Response Theory Models},
    author = {Alexander Robitzsch},
    year = {2025},
    note = {R package version 4.2-133},
    url = {https://CRAN.R-project.org/package=sirt},
    doi = {10.32614/CRAN.package.sirt},
  }

These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.