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arXiv 2501.04853econ.EM
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治疗历史部分可观测时动态治疗效应的识别

Identification of dynamic treatment effects when treatment histories are partially observed

Akanksha Negi, Didier Nibbering

AI总结:

针对治疗历史部分可观测下的路径依赖型治疗效应识别问题,本文提出结合三类模型的稳健双重差分估计量,仅需两类模型设定正确即可识别目标参数,在缺失和模型偏误场景下推断更准确,应用中估计结果与传统方法有实质差异。

摘要:

本文提出了一个通用的双重差分框架,用于在治疗历史部分可观测的情况下识别路径依赖型治疗效应。我们提出了一种新颖的稳健估计量,它结合结果模型、倾向得分模型和缺失治疗模型,对缺失的历史数据进行校正。我们证明,只要三个模型中的**任意两个**被正确设定,该方法就能识别目标参数。在相同的识别假设集下,该方法相比其他备选方法具有更强的稳健性。理论结果和数值实验表明,所提方法相比传统估计量和双重稳健估计量能得到更准确的推断,尤其是在存在显著缺失和模型设定偏误的场景下。两项应用研究显示,相比传统方法,该稳健方法对路径依赖型治疗效应的估计结果存在实质性差异。

英文摘要:

This paper presents a general difference-in-differences framework for identifying path-dependent treatment effects when treatment histories are partially observed. We introduce a novel robust estimator that adjusts for missing histories using a combination of outcome, propensity score, and missing treatment models. We show that this approach identifies the target parameter as long as \textit{any two} of the three models are correctly specified. The method delivers improved robustness against competing alternatives under the same set of identifying assumptions. Theoretical results and numerical experiments demonstrate how the proposed method yields more accurate inference compared to conventional and doubly robust estimators, particularly under nontrivial missingness and misspecification scenarios. Two applications demonstrate that the robust method can produce substantively different estimates of path-dependent treatment effects relative to conventional approaches.

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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