Using Panel Data for Macroeconomic Policy Evaluation: A Survey

In order to measure the macroeconomic effect of some policy or event, a "treatment", we need to construct a "counterfactual", a prediction of what would have happened in the absence of treatment, which is unobserved. Panel data for countries and regions, where the number of units and time periods are large, potentially provide untreated control groups which can be used to construct the counterfactual. A number of different procedures have been suggested for such policy evaluations, including the synthetic control method, SCM, and the panel data approach, PDA. We survey these and other methods.