To cite package ‘postGGIR’ in publications use:

  Guo W, Leroux A, Zipunnikov V, Merikangas K (2022). _postGGIR: Data
  Processing after Running 'GGIR' for Accelerometer Data_. R package
  version 2.4.0.2, <https://CRAN.R-project.org/package=postGGIR>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {postGGIR: Data Processing after Running 'GGIR' for Accelerometer Data},
    author = {Wei Guo and Andrew Leroux and Vadim Zipunnikov and Kathleen Merikangas},
    year = {2022},
    note = {R package version 2.4.0.2},
    url = {https://CRAN.R-project.org/package=postGGIR},
  }