论文标题
差异差异的趋势是什么？近期计量经济学文献的综合
What's Trending in Difference-in-Differences? A Synthesis of the Recent Econometrics Literature
论文作者
论文摘要
本文综合了差异差异的计量经济学（DID）的最新进展，并为从业者提供了具体的建议。我们首先要阐明一组简单的``规范''假设，在这些假设上，DID的计量经济学被众所周知。然后，我们认为，DID方法的最新进展可以广泛地归类为放松规范的DID设置的某些组成部分，重点是$（i）$（i）多个时期和治疗时间的变化，$（ii）$（ii）的潜在违反并行趋势，或$（iii）$ $（iii）$ n extlectative frameworks用于推论。我们的讨论强调了DID文献超越规范模型的不同方式，并有助于阐明何时每个论文都与经验工作相关。我们通过讨论一些有希望的未来研究领域来结束。
This paper synthesizes recent advances in the econometrics of difference-in-differences (DiD) and provides concrete recommendations for practitioners. We begin by articulating a simple set of ``canonical'' assumptions under which the econometrics of DiD are well-understood. We then argue that recent advances in DiD methods can be broadly classified as relaxing some components of the canonical DiD setup, with a focus on $(i)$ multiple periods and variation in treatment timing, $(ii)$ potential violations of parallel trends, or $(iii)$ alternative frameworks for inference. Our discussion highlights the different ways that the DiD literature has advanced beyond the canonical model, and helps to clarify when each of the papers will be relevant for empirical work. We conclude by discussing some promising areas for future research.
