To cite package ‘predictmeans’ in publications use:

  Luo D (2024). _predictmeans: Predicted Means for Linear and
  Semiparametric Models_. R package version 1.1.1,
  <https://CRAN.R-project.org/package=predictmeans>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {predictmeans: Predicted Means for Linear and Semiparametric Models},
    author = {Dongwen Luo},
    year = {2024},
    note = {R package version 1.1.1},
    url = {https://CRAN.R-project.org/package=predictmeans},
  }