To cite chaid in publications use:

  The FoRt Student Project Team 2009, Hothorn T, Zeileis A (2026).
  _chaid: Chi-Squared Automatic Interaction Detection_. R package
  version 0.1-3, <https://zeileis.codeberg.page/chaid/>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {{chaid}: Chi-Squared Automatic Interaction Detection},
    author = {{The FoRt Student Project Team 2009} and Torsten Hothorn and Achim Zeileis},
    year = {2026},
    note = {R package version 0.1-3},
    url = {https://zeileis.codeberg.page/chaid/},
  }