手法を比較

	パネルデータ傾向スコアマッチング	マッチング推定量
分野	因果推論	因果推論
系統	Regression model	Regression model
提唱年	1997-1998	1973
提唱者	Heckman, Ichimura & Todd	Rubin (1973); large-sample theory by Abadie & Imbens (2006)
種類	Matching / causal inference	Nonparametric matching / causal inference
原典	Heckman, J. J., Ichimura, H., & Todd, P. (1998). Matching as an Econometric Evaluation Estimator. Review of Economic Studies, 65(2), 261-294.	Abadie, A., & Imbens, G. W. (2006). Large Sample Properties of Matching Estimators for Average Treatment Effects. Econometrica, 74(1), 235-267.
別名	PSM with panel data, longitudinal PSM, panel PSM, difference-in-differences PSM	nearest-neighbor matching, NNM, matching on covariates, covariate matching
関連	6	6
概要	Panel data propensity score matching combines the bias-reduction of PSM with the longitudinal structure of panel data, enabling causal estimation of treatment effects by matching treated and control units on observable pre-treatment characteristics and then differencing within matched pairs over time. Developed in the framework of Heckman, Ichimura, and Todd (1998), it is especially valuable when randomisation is infeasible and both selection on observables and time-varying confounding must be addressed simultaneously.	The matching estimator identifies the causal effect of a treatment by pairing each treated unit with one or more untreated units that have similar observed characteristics. Formalised by Rubin (1973) and given rigorous large-sample theory by Abadie and Imbens (2006), it constructs a credible control group from observational data without requiring a parametric model for the outcome.