To cite package ‘pmvalsampsize’ in publications use:

Ensor J (2023). pmvalsampsize: Sample Size for External Validation of a Prediction Model. R package version 0.1.0, https://CRAN.R-project.org/package=pmvalsampsize.

Corresponding BibTeX entry:

  @Manual{,
    title = {pmvalsampsize: Sample Size for External Validation of a
      Prediction Model},
    author = {Joie Ensor},
    year = {2023},
    note = {R package version 0.1.0},
    url = {https://CRAN.R-project.org/package=pmvalsampsize},
  }