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arXiv 2112.04565econ.EM
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异质性处理效应的双向固定效应和差异中的差异:综述

Two-Way Fixed Effects and Differences-in-Differences with Heterogeneous Treatment Effects: A Survey

Clément de Chaisemartin, Xavier D'Haultfœuille

摘要:

具有时期和群体固定效应的线性回归被广泛用于估计政策效果:2015年至2019年,《美国经济评论》发表的100篇被引用最多的论文中有26篇估计了此类回归。最近的研究表明,如果政策的影响在不同群体之间或在一段时间内是不均匀的,这种回归可能会产生误导性的估计,而这种情况往往是如此。本调查回顾了快速增长的文献,记录了这个问题,并提出了其他估计稳健的异质性影响。我们使用这些替代估计重新访问Wolfers(2006)。

英文摘要:

Linear regressions with period and group fixed effects are widely used to estimate policies' effects: 26 of the 100 most cited papers published by the American Economic Review from 2015 to 2019 estimate such regressions. It has recently been shown that those regressions may produce misleading estimates, if the policy's effect is heterogeneous between groups or over time, as is often the case. This survey reviews a fast-growing literature that documents this issue, and that proposes alternative estimators robust to heterogeneous effects. We use those alternative estimators to revisit Wolfers (2006).

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