An Anatomy of Event Studies: Hypothetical Experiments, Exact Decomposition, and Weighting Diagnostics
事件研究剖析:假想实验、精确分解与权重诊断
In recent decades, event studies have emerged as a central methodology in health and social research for evaluating the causal effects of staggered interventions. In this paper, we analyze event studies from experimental design principles for observational studies, with a focus on information borrowing across measurements. We develop robust weighting estimators that increasingly use more information across units and time periods, justified by increasingly stronger…