방법 비교

	Machine Learning-Augmented Difference-in-Differences (ML-DiD)	동적 이중차분법 (Dynamic Difference-in-Differences)
분야	인과추론	인과추론
계열	Regression model	Regression model
기원 연도	2018-2020	2021
창시자	Chernozhukov et al. (double/debiased ML framework); Sant'Anna & Zhao (2020) for DR-DiD	Callaway & Sant'Anna; Sun & Abraham
유형	Causal inference / semiparametric	Causal inference / quasi-experimental
원전	Chernozhukov, V., Chetverikov, D., Demirer, M., Duflo, E., Hansen, C., Newey, W., & Robins, J. (2018). Double/debiased machine learning for treatment and structural parameters. The Econometrics Journal, 21(1), C1-C68.	Callaway, B., & Sant'Anna, P. H. C. (2021). Difference-in-differences with multiple time periods. Journal of Econometrics, 225(2), 200-230.
별칭	ML-DiD, double/debiased ML DiD, DML difference-in-differences, augmented DiD	Dynamic DiD, Staggered DiD, Event-time DiD, Heterogeneous-timing DiD
관련	6	4
요약	Machine learning-augmented DiD combines the classic difference-in-differences identification strategy with flexible ML estimators for nuisance functions — the propensity score and the outcome regression — to obtain valid causal estimates even when treatment selection and outcome dynamics are complex, high-dimensional, or nonlinear. The approach, rooted in double/debiased machine learning (Chernozhukov et al., 2018) and doubly-robust DiD (Sant'Anna & Zhao, 2020), guards against misspecification bias while preserving the core DiD logic of before-after, treated-versus-control comparisons.	Dynamic Difference-in-Differences extends the classic DiD framework to settings where units adopt treatment at different times. Rather than collapsing all variation into a single 2x2 comparison, it estimates group-time average treatment effects for each adoption cohort at each calendar period, then aggregates them into interpretable summaries of the causal effect over event time.