To cite package ‘PSPI’ in publications use:

  Zou J, Chen Q, Schwartz J, Moise N, Little R (2025). _PSPI:
  Propensity Score Predictive Inference for Generalizability_. R
  package version 1.2, <https://github.com/zjg540066169/pspi>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {PSPI: Propensity Score Predictive Inference for Generalizability},
    author = {Jungang Zou and Qixuan Chen and Joseph Schwartz and Nathalie Moise and Roderick Little},
    year = {2025},
    note = {R package version 1.2},
    url = {https://github.com/zjg540066169/pspi},
  }