To cite package ‘lrstat’ in publications use:

  Lu K (2024). _lrstat: Power and Sample Size Calculation for
  Non-Proportional Hazards and Beyond_. R package version 0.2.9,
  <https://CRAN.R-project.org/package=lrstat>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {lrstat: Power and Sample Size Calculation for Non-Proportional Hazards
and Beyond},
    author = {Kaifeng Lu},
    year = {2024},
    note = {R package version 0.2.9},
    url = {https://CRAN.R-project.org/package=lrstat},
  }