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arXiv 2008.00707stat.ME
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聚类网络干扰下的异质性处理效应与溢出效应

Heterogeneous Treatment and Spillover Effects under Clustered Network Interference

Falco J. Bargagli-Stoffi, Costanza Tortù, Laura Forastiere

AI总结:

针对聚类网络中的邻域干扰问题,提出基于树算法与 Horvitz-Thompson 估计量的 NCT 方法,用于识别处理与溢出效应的异质性,并经模拟和农村保险实例验证。

摘要:

大多数因果推断研究都排除了单元之间存在干扰的可能性。然而,在许多现实场景中,单元之间通过社会、物理或虚拟联系相互连接,处理的效应可能从一个单元溢出到网络中与其相连的其他个体。本文中,我们开发了一种机器学习方法,该方法使用基于树的算法和 Horvitz-Thompson 估计量,在聚类网络以及聚类内部邻域干扰的背景下,评估处理效应和溢出效应在个体、邻域和网络特征方面的异质性。所提出的 Network Causal Tree(NCT,网络因果树)算法具有若干优势。首先,它允许研究处理效应的异质性,避免因干扰的存在而导致的潜在偏误。其次,理解处理效应和溢出效应两者的异质性,可以指导政策制定者扩大干预规模、设计定向策略并提高成本效益。我们通过 Monte Carlo 模拟研究考察了 NCT 方法的性能,并通过其在中国农村评估信息宣讲会对购买新型天气保险政策的异质性影响来说明该方法的应用。

英文摘要:

The bulk of causal inference studies rule out the presence of interference between units. However, in many real-world scenarios, units are interconnected by social, physical, or virtual ties, and the effect of the treatment can spill from one unit to other connected individuals in the network. In this paper, we develop a machine learning method that uses tree-based algorithms and a Horvitz-Thompson estimator to assess the heterogeneity of treatment and spillover effects with respect to individual, neighborhood, and network characteristics in the context of clustered networks and neighborhood interference within clusters. The proposed Network Causal Tree (NCT) algorithm has several advantages. First, it allows the investigation of the treatment effect heterogeneity, avoiding potential bias due to the presence of interference. Second, understanding the heterogeneity of both treatment and spillover effects can guide policy-makers in scaling up interventions, designing targeting strategies, and increasing cost-effectiveness. We investigate the performance of our NCT method using a Monte Carlo simulation study, and we illustrate its application to assess the heterogeneous effects of information sessions on the uptake of a new weather insurance policy in rural China.

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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