To cite package ‘DPI’ in publications use:

  Bao H (2026). _DPI: The Directed Prediction Index for Causal
  Direction Inference from Observational Data_. R package version
  2026.2, <https://github.com/psychbruce/dpi>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {DPI: The Directed Prediction Index for Causal Direction Inference
from Observational Data},
    author = {Han Wu Shuang Bao},
    year = {2026},
    note = {R package version 2026.2},
    url = {https://github.com/psychbruce/dpi},
  }