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arXiv 2007.10432econ.EMstat.ME
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针对仪器的治疗效果

Treatment Effects with Targeting Instruments

Columbia University(哥伦比亚大学);Institute for Fiscal Studies(财政研究所);FGV EPGE(巴西经企基金会经济政策研究所)

Sokbae Lee, Bernard Salanié

AI总结:

本文探讨了通过离散值仪器控制选择偏差的方法,分析了复合合规组的治疗效果识别问题,并通过Head Start研究展示了正向选择假设的识别力量。

摘要:

多值治疗在应用中很常见。我们探讨了使用离散值仪器来控制此设置中的选择偏差。我们的讨论围绕“目标”概念展开:哪些仪器针对哪些治疗。这使我们能够建立条件,以确定复合合规组的反事实平均值和治疗效果是点识别或部分识别的。我们探讨了正向选择假设的额外识别力量。我们通过重新审视Kline和Walters(2016)对Head Start影响研究的发现来展示其有用性。我们推导出有信息的界限,表明Head Start扩展的有益效果比参数估计要小。

英文摘要:

Multivalued treatments are commonplace in applications. We explore the use of discrete-valued instruments to control for selection bias in this setting. Our discussion revolves around the concept of targeting: which instruments target which treatments. It allows us to establish conditions under which counterfactual averages and treatment effects are point- or partially-identified for composite complier groups. We explore the additional identifying power of a positive selection assumption. We illustrate its usefulness by revisiting the findings of Kline and Walters (2016) on the Head Start Impact Study. We derive informative bounds that suggest less beneficial effects of Head Start expansions than their parametric estimates.

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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