To cite package ‘eff2’ in publications use:

Guo R (2026). eff2: Efficient Least Squares for Total Causal Effects. R package version 1.0.2, https://github.com/richardkwo/eff2.

Corresponding BibTeX entry:

  @Manual{,
    title = {eff2: Efficient Least Squares for Total Causal Effects},
    author = {Richard Guo},
    year = {2026},
    note = {R package version 1.0.2},
    url = {https://github.com/richardkwo/eff2},
  }