To cite package ‘crs’ in publications use:

Racine J, Nie Z (2026). crs: Categorical Regression Splines. R package version 0.15-45, https://github.com/jeffreyracine/r-package-crs.

Corresponding BibTeX entry:

  @Manual{,
    title = {crs: Categorical Regression Splines},
    author = {Jeffrey S. Racine and Zhenghua Nie},
    year = {2026},
    note = {R package version 0.15-45},
    url = {https://github.com/jeffreyracine/r-package-crs},
  }