To cite package ‘rda’ in publications use:

Guo Y, Hastie T, Tibshirani R, Todorov V (2026). rda: Shrunken Centroids Regularized Discriminant Analysis. R package version 1.2-2, https://github.com/valentint/rda.

Corresponding BibTeX entry:

  @Manual{,
    title = {rda: Shrunken Centroids Regularized Discriminant
      Analysis},
    author = {Yaqian Guo and Trevor Hastie and Robert Tibshirani and
      Valentin Todorov},
    year = {2026},
    note = {R package version 1.2-2},
    url = {https://github.com/valentint/rda},
  }