3 papers
econ.EM2026
On Local Overidentification and Efficiency Gains in Modern Causal Inference and Data Combination
Xiaohong Chen, Haitian Xie
This paper studies nonparametric local (over-)identification and the semiparametric efficiency in modern causal frameworks. We develop a unified approach that begins by translating…
econ.EM2025
Difference-in-Differences Meets Synthetic Control: Doubly Robust Identification and Estimation
Yixiao Sun, Haitian Xie, Yuhang Zhang
Difference-in-Differences (DiD) and Synthetic Control (SC) are widely used methods for causal inference in panel data, each with distinct strengths and limitations. We propose a no…
econ.EM2025
Efficient Difference-in-Differences and Event Study Estimators
Xiaohong Chen, Pedro H. C. Sant'Anna, Haitian Xie
This paper investigates efficient Difference-in-Differences (DiD) and Event Study (ES) estimation using short panel data sets within the heterogeneous treatment effect framework, f…