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arXiv 2201.08012stat.ME
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具有目标样本摘要信息的因果推广的熵平衡

Entropy Balancing for Causal Generalization with Target Sample Summary Information

Rui Chen, Guanhua Chen, Menggang Yu

摘要:

在本文中,我们专注于估计目标人群的平均处理效应(ATE),当来自源人群的个体水平数据和汇总水平数据(例如,某些协变量的一阶矩或二阶矩)。在存在异质性处理效应的情况下,当处理效应修饰因子在这两个群体中的分布不同时,目标群体的ATE可能不同于源群体的ATE,这种现象也称为协变量偏移。已经开发了许多方法来调整协变量偏移,但大多数方法需要来自代表性目标样本的单个协变量。我们开发了一种加权方法的基础上,总结水平的信息,从目标样本,以调整可能的协变量转移的效果修饰符。特别地,源样本内的处理组和对照组的权重通过目标样本的概要级信息来校准。我们的方法还寻求源样本中治疗组和对照组之间的额外协变量平衡。我们研究了在广泛的条件下目标总体ATE的相应加权估计的渐近性态。在模拟研究和实际数据应用中证实了理论意义。

英文摘要:

In this paper, we focus on estimating the average treatment effect (ATE) of a target population when individual-level data from a source population and summary-level data (e.g., first or second moments of certain covariates) from the target population are available. In the presence of heterogeneous treatment effect, the ATE of the target population can be different from that of the source population when distributions of treatment effect modifiers are dissimilar in these two populations, a phenomenon also known as covariate shift. Many methods have been developed to adjust for covariate shift, but most require individual covariates from a representative target sample. We develop a weighting approach based on summary-level information from the target sample to adjust for possible covariate shift in effect modifiers. In particular, weights of the treated and control groups within a source sample are calibrated by the summary-level information of the target sample. Our approach also seeks additional covariate balance between the treated and control groups in the source sample. We study the asymptotic behavior of the corresponding weighted estimator for the target population ATE under a wide range of conditions. The theoretical implications are confirmed in simulation studies and a real data application.

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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