To cite the UN-DID paper, please use:

Karim S, Webb M, Austin N, Strumpf E (2024). “Difference-in-Differences with Unpoolable Data.” arXiv preprint arXiv:2403.15910. https://arxiv.org/abs/2403.15910.

If you are using randomization inference p-values, please also cite:

MacKinnon J, Webb M (2020). “Randomization inference for difference-in-differences with few treated clusters.” Journal of Econometrics, 218(2), 435-450. https://doi.org/10.1016/j.jeconom.2020.04.024.

To cite the undidR software package:

Jamieson E (2025). “undidR: Difference-in-Differences with Unpoolable Data.” R package version 3.0.0, https://doi.org/10.32614/CRAN.package.undidR.

Corresponding BibTeX entries:

  @Article{,
    title = {Difference-in-Differences with Unpoolable Data},
    author = {Sunny Karim and Matthew D. Webb and Nichole Austin and
      Erin Strumpf},
    year = {2024},
    journal = {arXiv preprint arXiv:2403.15910},
    url = {https://arxiv.org/abs/2403.15910},
  }

  @Article{,
    title = {Randomization inference for difference-in-differences with
      few treated clusters},
    author = {James G. MacKinnon and Matthew D. Webb},
    year = {2020},
    journal = {Journal of Econometrics},
    volume = {218},
    number = {2},
    pages = {435-450},
    url = {https://doi.org/10.1016/j.jeconom.2020.04.024},
  }

  @Misc{,
    title = {undidR: Difference-in-Differences with Unpoolable Data},
    author = {Eric Jamieson},
    year = {2025},
    note = {R package version 3.0.0},
    url = {https://doi.org/10.32614/CRAN.package.undidR},
  }