Working Papers

1. Doubly Robust Difference-in-Differences Estimators, joint with Jun B. Zhao. November 2018.
[Supplementary Appendix]

2. Covariate Distribution Balance via Propensity Scores, joint with Xiaojun Song and Qi Xu. This version: February 2019. First version: August 2018 .
[Supplementary Appendix]

3. Difference-in-Differences with Multiple Time Periods and an Application on the Minimum Wage and Employment, joint with Brantly Callaway. This version: August 2018. First version: March 2018 .
[Supplementary Appendix] [Software implementation: R package did ]

4. Nonparametric Tests for Treatment Effect Heterogeneity with Duration Outcomes, April 2017.
This is a revised version of my JMP, “Nonparametric tests for conditional treatment effects with duration outcomes”, November 2014.
[ Supplementary Appendix] [ Software implementation: R package kmte ]

5. Program Evaluation with Right-Censored Data, April 2016.
[Supplementary Appendix] [Software implementation: R package kmte]


6. Specification Tests for the Propensity Score, joint with Xiaojun Song. February 2019.
Forthcoming at the Journal of Econometrics.
[Software implementation: R package pstest] [Replication files available upon request - soon to be posted here!]

7. Testing for Uncorrelated Residuals in Dynamic Count Models with an Application to Corporate Bankruptcy, 2017.
Journal of Business & Economics Statistics, vol. 35 (3), 349-358.
[Replication files available upon request]