To cite package ‘YPPE’ in publications use:

Demarqui F (2023). YPPE: Yang and Prentice Model with Piecewise Exponential Baseline Distribution. R package version 1.1.0, https://github.com/fndemarqui/yppe.

Corresponding BibTeX entry:

  @Manual{,
    title = {YPPE: Yang and Prentice Model with Piecewise Exponential
      Baseline Distribution},
    author = {Fabio Demarqui},
    year = {2023},
    note = {R package version 1.1.0},
    url = {https://github.com/fndemarqui/yppe},
  }