Research

Publications

1. Difference-in-Differences Designs: A Practitioner’s Guide, (with Andrew Baker, Scott Cunningham, Andrew Goodman-Bacon, and Pedro H.C. Sant’Anna, forthcoming at Journal of Economic Literature)

2. Evaluating Policies Early in a Pandemic: Bounding Policy Effects with Nonrandomly Missing Data [arXiv] [Supplementary Appendix] (with Tong Li, Review of Economics and Statistics, Vol. 107, No. 3, pp. 803–819, 2025.)

3. Event Studies with a Continuous Treatment [pre-print] (with Andrew Goodman-Bacon and Pedro Sant’Anna, AEA Papers & Proceedings, Vol. 114, pp. 601–605, 2024.)

4. Policy Evaluation during a Pandemic [arXiv] [5 Minute Summary] [Supplementary Appendix] (with Tong Li, Journal of Econometrics, Vol. 236, No. 1, 2023.)

   • Code: ppe R package, on GitHub

5. Difference-in-Differences for Policy Evaluation [Draft Version] [complete code (In: Zimmermann, K.F. (eds) Handbook of Labor, Human Resources and Population Economics., pp. 1–61, 2023)

6. Treatment Effects in Interactive Fixed Effects Models with a Small Number of Time Periods [arXiv] [Supplementary Appendix] (with Sonia Karami, Journal of Econometrics, Vol. 233, No. 1, pp. 184–208, 2023.)

   • Code: ife R package, on GitHub

7. Heterogeneous Effects of Job Displacement on Earnings [arXiv] (with Afrouz Azadikhah Jahromi, Empirical Economics, Vol. 62, No. 1, pp. 213–245, 2022.)

8. Difference-in-Differences with Multiple Time Periods [arXiv] [Supplementary Appendix] (with Pedro H.C. Sant’Anna, Journal of Econometrics, Vol. 225, No. 2, pp. 200–230, 2021.)

   • Code: did R package

9. Bounds on Distributional Treatment Effect Parameters using Panel Data with an Application on Job Displacement [arXiv] [Supplementary Appendix] (Journal of Econometrics, Vol. 222, No. 2, pp. 861–881, 2021.)

   • Code: csabounds R package

10. Distributional Effects of a Continuous Treatment with an Application on Intergenerational Mobility [Working Paper] [SSRN] [Supplementary Appendix] (with Weige Huang, Oxford Bulletin of Economics and Statistics, Vol. 82, No. 4, pp. 808–842, 2020)

    • Code: ccfa R package

11. Quantile Treatment Effects in Difference in Differences Models with Panel Data [Working Paper Version] [SSRN] [Supplementary Appendix] [Replication Materials] (with Tong Li, Quantitative Economics, Vol. 10, No. 4, pp. 1579–1618, 2019)

    • Code: panel.qtet method in R qte package

12. Local Intergenerational Elasticities [SSRN] [Supplementary Appendix] (with Weige Huang, Economics Bulletin, Vol. 39, No. 2, pp. 919-928, 2019)

13. Quantile Treatment Effects in Difference in Differences Models under Dependence Restrictions and with only Two Time Periods (with Tong Li and Tatsushi Oka, Journal of Econometrics, 206(2), pp. 395–413, 2018) [arXiv Version]

    • Code: ddid2 method in R qte package

14. Unions, Workers, and Wages at the Peak of the American Labor Movement (with William Collins, Explorations in Economic History, Vol. 68, pp. 95–118, 2018) [NBER Version]

Working Papers

• Testing the Effects of an Unobservable Factor: Do Marriage Prospects Affect College Major Choice? (with Alper Arslan and Tong Li, submitted)

• Treatment Effects in Staggered Adoption Designs with Non-Parallel Trends (with Emmanuel Tsyawo)

• Regulation, Emissions, and Productivity: Evidence from China’s Eleventh Five-Year Plan (with Tong Li, Joel Rodrigue, Yuya Sasaki, and Yong Tan, submitted)

• Difference-in-Differences when Parallel Trends Holds Conditional on Covariates [Supplementary Appendix] [arXiv] (with Carolina Caetano, revise and resubmit)

• Distributional Effects with Two-Sided Measurement Error: An Application to Intergenerational Income Mobility [arXiv] (with Tong Li and Irina Murtazashvili, revise and resubmit)

• Difference-in-Differences with a Continuous Treatment [5 Minute Summary] [Slides] [Supplementary Appendix] (with Andrew Goodman-Bacon and Pedro H.C. Sant’Anna, revise and resubmit)

Work in Progress

• Inference on Counterfactual Transition Matrices (with Chengye Jia and Karen Yan)

• Difference-in-Differences with Bad Controls (with Carolina Caetano, Stroud Payne, and Hugo Sant’Anna)

Resting Papers

• Adoption and Diffusion of Health Information Technology: The Case of Primary Care Clinics (with Vivek Ghosal)

• Difference in Differences with Time Varying Covariates [5 Minute Summary] (with Carolina Caetano, Stroud Payne, and Hugo Sant’Anna Rodrigues)

  • This paper is the ancestor of (and is replaced by) “Difference-in-Differences when Parallel Trends Holds Conditional on Covariates” and “Difference-in-Differences with Bad Controls”