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arXiv 2201.06898econ.EM
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连续分布在每个时期的处理的差异-差异估计量

Difference-in-Differences Estimators for Treatments Continuously Distributed at Every Period

Sciences Po Paris(巴黎政治学院);CREST-ENSAE(法国国家统计与经济研究所经济研究中心);Princeton University(普林斯顿大学);University of California, Santa Barbara(加州大学圣塔芭芭拉分校)

Clément de Chaisemartin, Xavier D'Haultfœuille, Félix Pasquier, Doulo Sow, Gonzalo Vazquez-Bare

AI总结:

本文提出了一种用于连续分布处理的差异-差异估计方法,通过区分转换者和保持者,非参数地识别处理效应,并提出双重鲁棒的估计量。

摘要:

在使用面板数据研究税收、关税或价格的影响时,处理通常在每个时期内连续分布。我们为这种设置开发了差异-差异(DID)估计量。我们将单位分为转换者,其处理在连续时期之间变化,和保持者,其处理保持不变。在平行趋势假设下,我们证明转换者潜在结果对处理的斜率通过转换者和保持者之间的DID比较非参数地被识别出来,这些转换者和保持者具有相同的基线处理水平。在基线处理上进行条件是关键的,因为它确保了平行趋势假设能够容纳时间变化的处理效应。我们然后研究了这些斜率的两种加权平均,讨论了它们各自的优势,并为每种提出一种双重鲁棒、半参数高效且n的平方根一致的估计量。最后,我们将我们的框架扩展到工具变量,并通过估计汽油税对价格和燃料消费的影响来说明。

英文摘要:

When studying the effects of taxes, tariffs, or prices using panel data, the treatment is often continuously distributed in every period. We develop difference-in-differences (DID) estimators for such settings. We partition units into switchers, whose treatment changes between consecutive periods, and stayers, whose treatment remains constant. Under a parallel-trends assumption, we show that the slopes of switchers' potential outcomes with respect to the treatment are nonparametrically identified by DID comparisons between switchers and stayers sharing the same baseline treatment level. Conditioning on the baseline treatment is key, as it ensures that the underlying parallel-trends assumption accommodates time-varying treatment effects. We then study two weighted averages of these slopes, discuss their respective advantages, and propose for each a doubly robust, semiparametrically efficient, and $\sqrt{n}$-consistent estimator. Finally, we extend our framework to instrumental variables and illustrate it by estimating the effects of gasoline taxes on prices and fuel consumption.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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