[WP8]. Beyond Parallel Trends: An Identification-Strategy-Robust Approach to Causal Inference with Panel Data

with Brantly Callaway, Derek Dyal, and Emmanuel S. Tsyawo
This version: November 2025.
[arXiv] [pdf]

[WP7]. Efficient Difference-in-Differences and Event-Study Estimators

with Xiaohong Chen and Haitian Xie
This version: June 2025.
[arXiv] [pdf] [Supplementary Appendix]

[WP6]. Better Understanding Triple Differences Estimators

with Marcelo Ortiz-Villavicencio
This version: May 2025.
[arXiv] [pdf]

[WP5]. Was Javert right to be suspicious? Marginal Treatment Effects with Duration Outcomes.

with Santiago Acerenza and Vitor Possebom
Revise and Resubmit, Review of Economics and Statistics
This version: April 2026. First version: April 2023.
[arXiv] [pdf]

[WP4]. Doubly Robust Estimators with Weak Overlap.

with Yukun Ma, Yuya Sasaki, and Takuya Ura
This version: April 2026. First version: April 2023.
[arXiv] [pdf]

[WP3]. Selection and Parallel Trends.

with Dalia Ghanem and Kaspar Wüthrich
This version: February 2026. First version: March 2022.
[arXiv] [pdf]

[WP2]. Difference-in-Differences with a Continuous Treatment.

with Brantly Callaway and Andrew Goodman-Bacon
Conditionally Accepted (replication checks), American Economic Review
This version: Dec 2025. First version: July 2021.
[arXiv] [pdf] [Supplementary Appendix]

[WP1]. Program Evaluation with Right-Censored Data

This version: April 2016.
Reject and Resubmit
[Supplementary Appendix] [R package: kmte]

Publications

[16]. When should pre-trends be parallel?

with Dalia Ghanem and Kaspar Wüthrich
AEA Papers and Proceedings, vol. 116, p. 64–69, 2026
[pdf]

[15]. Difference-in-Differences with Compositional Changes.

with Qi Xu
Journal of Econometrics, vol. 253, 106147, 2026
[arXiv] [pdf] [Appendix]

[14]. Specification tests for generalised propensity scores using double projections

with Juan Carlos Escanciano and Xiaojun Song
Journal of Nonparametric Statistics, vol. 38 (1), p. 177–213, 2026
[arXiv (previous version)] [pdf]

[13]. Difference-in-Differences Designs: A Practitioner's Guide

with Andrew Baker, Brantly Callaway, Scott Cunningham, and Andrew Goodman-Bacon
Journal of Economic Literature, Forthcoming
[arXiv] [pdf] [GitHub Repo] [Interactive replication]

[12]. Event Studies with a Continuous Treatment.

with Brantly Callaway and Andrew Goodman-Bacon
AEA Papers and Proceedings, vol. 114, p. 601–605, 2024
[pdf] [Replication files]

[11]. Efficient Estimation for Staggered Rollout Designs.

with Jonathan Roth
Journal of Political Economy: Microeconomics, vol. 1 (4), p. 669–709, 2023
[arXiv] [pdf] [R (and Stata) package: staggered]

[10]. When Is Parallel Trends Sensitive to Functional Form?

with Jonathan Roth
Econometrica, vol. 91 (2), p. 737-747, 2023
[arXiv] [pdf]

[9]. What's Trending in Difference-in-Differences? A Synthesis of the Recent Econometrics Literature.

with Jonathan Roth, Alyssa Bilinski and John Poe
Journal of Econometrics, vol. 235 (2), p. 2218-2244, 2023
[arXiv] [pdf]

[8]. Covariate Distribution Balance via Propensity Scores.

with Xiaojun Song and Qi Xu.
Journal of Applied Econometrics, vol. 37 (6), p. 1093-1120, 2022
[arXiv] [pdf] [Supplementary Appendix] [R package: IPS]

[7]. Distribution Regression in Duration Analysis: an Application to Unemployment Spells.

with Miguel A. Delgado and Andrés García-Suaza.
Econometrics Journal, vol. 25 (3), p. 675–698, 2022.
[arXiv] [pdf] [Supplementary Appendix] [Replication files]

[6]. Difference-in-Differences with Multiple Time Periods.

with Brantly Callaway.
Journal of Econometrics, vol. 225 (2), p. 200-230, 2021.
[arXiv] [pdf] [Supplementary Appendix] [R package: did] [Python package: CSDID] [Slides]
Previous versions were circulated as "Difference-in-Differences with Multiple Time Periods and an Application on the Minimum Wage and Employment".

[5]. The Role of Parallel Trends in Event Study Settings: An Application to Environmental Economics.

with Michelle M. Marcus.
Journal of the Association of Environmental and Resource Economists, vol. 8 (2), p. 235–275, 2021.
[arXiv] [pdf] [Supplementary Appendix] [R package] [Replication files] [Slides]

[4]. Doubly Robust Difference-in-Differences Estimators.

with Jun Zhao
Journal of Econometrics, vol. 219 (1), p. 101-122, 2020.
[arXiv] [pdf] [Supplementary Appendix] [R package: DRDID][Python package: DRDID] [Replication files] [Slides]

[3]. Nonparametric Tests for Treatment Effect Heterogeneity with Duration Outcomes.

Journal of Business & Economic Statistics, vol. 39 (3), p. 816-832, 2021.
[SSRN] [arXiv] [Supplementary Appendix] [ R package: kmte]
This is a revised version of my earlier draft, "Nonparametric tests for conditional treatment effects with duration outcomes", November 2014.

[2]. Specification Tests for the Propensity Score.

with Xiaojun Song.
Journal of Econometrics, vol. 210 (2), p. 379-404, 2019.
[SSRN] [arXiv] [R package: pstest] [Replication files]

[1]. Testing for Uncorrelated Residuals in Dynamic Count Models with an Application to Corporate Bankruptcy.

Journal of Business & Economic Statistics, vol. 35 (3), p. 349-358, 2017.

Comments

Comments and Revised Findings for "Procedural justice training reduces police use of force and complaints against officers"

with Jonathan Roth, George Wood, Andrew Papachristos, and Tom Tyler.
[Summary] [Initial Letter] [Reanalysis]