To cite the DID-INT paper, please use:

Karim S, Webb M (2025). “Good Controls Gone Bad: Difference-in-Differences with Covariates.” arXiv preprint arXiv:2412.14447. https://arxiv.org/abs/2412.14447.

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 didintrjl software package:

Jamieson E (2026). “didintrjl: Intersection difference-in-differences in R.” R package version 0.2.6, https://github.com/ebjamieson97/didintrjl.

Corresponding BibTeX entries:

  @Article{,
    title = {Good Controls Gone Bad: Difference-in-Differences with
      Covariates},
    author = {Sunny Karim and Matthew D. Webb},
    year = {2025},
    journal = {arXiv preprint arXiv:2412.14447},
    url = {https://arxiv.org/abs/2412.14447},
  }

  @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 = {didintrjl: Intersection difference-in-differences in R},
    author = {Eric Jamieson},
    year = {2026},
    note = {R package version 0.2.6},
    url = {https://github.com/ebjamieson97/didintrjl},
  }