To cite package ‘rtestim’ in publications use:

  McDonald D, Liu J (2026). _rtestim: Estimate the Effective
  Reproductive Number with Trend Filtering_. R package version
  1.0.2.9001, <https://github.com/dajmcdon/rtestim>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {rtestim: Estimate the Effective Reproductive Number with Trend Filtering},
    author = {Daniel J. McDonald and Jiaping Liu},
    year = {2026},
    note = {R package version 1.0.2.9001},
    url = {https://github.com/dajmcdon/rtestim},
  }