To cite package ‘PenCoxFrail’ in publications use:

Groll A (2025). PenCoxFrail: Regularization in Cox Frailty Models. R package version 2.0.1, https://CRAN.R-project.org/package=PenCoxFrail.

Corresponding BibTeX entry:

  @Manual{,
    title = {PenCoxFrail: Regularization in Cox Frailty Models},
    author = {Andreas Groll},
    year = {2025},
    note = {R package version 2.0.1},
    url = {https://CRAN.R-project.org/package=PenCoxFrail},
  }