To cite package ‘YPPE’ in publications use:

Demarqui F (2020). YPPE: Yang and Prentice Model with Piecewise Exponential Baseline Distribution. R package version 1.0.1, https://CRAN.R-project.org/package=YPPE.

Corresponding BibTeX entry:

  @Manual{,
    title = {YPPE: Yang and Prentice Model with Piecewise Exponential
      Baseline Distribution},
    author = {Fabio Demarqui},
    year = {2020},
    note = {R package version 1.0.1},
    url = {https://CRAN.R-project.org/package=YPPE},
  }