To cite package ‘PSPI’ in publications use:

Zou J, Chen Q, Schwartz J, Moise N, Little R (2026). PSPI: Propensity Score Predictive Inference for Generalizability and Transportability. R package version 1.4, https://CRAN.R-project.org/package=PSPI.

Corresponding BibTeX entry:

  @Manual{,
    title = {PSPI: Propensity Score Predictive Inference for
      Generalizability and Transportability},
    author = {Jungang Zou and Qixuan Chen and Joseph Schwartz and
      Nathalie Moise and Roderick Little},
    year = {2026},
    note = {R package version 1.4},
    url = {https://CRAN.R-project.org/package=PSPI},
  }