Wing, Coady; Freedman, Seth; Hollingsworth, Alex - National Bureau of Economic Research - 2024
investigate the performance of stacked DID estimators. We show that the most basic stacked estimator does not identify the target … bias can be eliminated using corrective sample weights. We present a weighted stacked DID estimator, and show that it … correctly identifies the target aggregate, providing justification for using the estimator in applied work …