To cite package ‘ppmSDR’ in publications use:

Shin J, Shin SJ (2026). ppmSDR: Penalized Principal Machine for Sufficient Dimension Reduction. R package version 2.0.0, https://github.com/c16267/ppmsdr.

Corresponding BibTeX entry:

  @Manual{,
    title = {ppmSDR: Penalized Principal Machine for Sufficient
      Dimension Reduction},
    author = {Jungmin Shin and Seung Jun Shin},
    year = {2026},
    note = {R package version 2.0.0},
    url = {https://github.com/c16267/ppmsdr},
  }