Compara mètodes

	Emparellament per Puntuació de Propensió amb Dades de Panell	Estimador per emparellament
Camp	Inferència causal	Inferència causal
Família	Regression model	Regression model
Any d'origen	1997-1998	1973
Autor original	Heckman, Ichimura & Todd	Rubin (1973); large-sample theory by Abadie & Imbens (2006)
Tipus	Matching / causal inference	Nonparametric matching / causal inference
Font seminal	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.
Àlies	PSM with panel data, longitudinal PSM, panel PSM, difference-in-differences PSM	nearest-neighbor matching, NNM, matching on covariates, covariate matching
Relacionats	6	6
Resum	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.