方法对比

	多期匹配估计量	粗化精确匹配 (CEM)
领域	因果推断	因果推断
方法族	Regression model	Regression model
起源年份	2005	2011-2012
提出者	Abadie (2005); Imbens & Wooldridge (2009)	Iacus, King, & Porro
类型	Quasi-experimental / causal inference	Matching / causal inference
开创性文献	Abadie, A. (2005). Semiparametric Difference-in-Differences Estimators. Review of Economic Studies, 72(1), 1-19.	Iacus, S. M., King, G., & Porro, G. (2012). Causal Inference without Balance Checking: Coarsened Exact Matching. Political Analysis, 20(1), 1-24.
别名	panel matching estimator, longitudinal matching, multi-wave matching, repeated-cross-section matching	CEM, coarsened matching, monotonic imbalance bounding matching
相关	6	6
摘要	The multi-period matching estimator extends the standard matching framework to settings with multiple time periods, pairing each treated unit to similar untreated units based on pre-treatment covariates or propensity scores, then using within-pair before-after differences to estimate the average treatment effect on the treated (ATT). Leveraging repeated observations, it simultaneously controls for observed confounders and time-invariant unobserved heterogeneity.	Coarsened Exact Matching is a preprocessing method that achieves covariate balance by temporarily coarsening continuous variables into bins, exactly matching treated and control units within those bins, and then discarding all unmatched units. Introduced by Iacus, King, and Porro (2011, 2012), it bounds imbalance on each covariate independently, yielding a matched sample on which any estimator can be applied without relying on a propensity score model.