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AI 根据所提供的论文材料归类:摘要明确研究观测数据中的混杂调整和因果效应估计,对应因果推断。

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关注这篇论文的作者
Chanmin Kim
Mauricio Tec
Corwin M Zigler

混杂调整的贝叶斯非参数方法

研究问题
观测研究拥有大量候选协变量时,如何选择混杂调整变量、容纳复杂关系,并将混杂结构的不确定性纳入因果估计?
方法与思路
作者通过共同先验连接多个贝叶斯加性回归树模型,依据协变量与暴露及结局的关联累积后验选择概率。
材料陈述的贡献
摘要称,方法同时处理混杂变量选择、非线性效应估计及选择不确定性,并在模拟和燃煤电厂污染应用中展示表现。
阅读关注点
应核对共同先验如何实现混杂选择原则、因果识别所需条件,以及模拟比较和跨年稳定性评价的具体设计。
阅读边界
这是 arXiv 预印本,不能据此认定已经同行评审或期刊接收;摘要未说明完整识别条件,变量筛选无法自动排除未测混杂。

原文摘要

Analysis of observational studies increasingly confronts the challenge of determining which of a possibly high-dimensional set of available covariates are required to satisfy the assumption of ignorable treatment assignment for estimation of causal effects. We propose a Bayesian nonparametric approach that simultaneously 1) prioritizes inclusion of adjustment variables in accordance with existing principles of confounder selection; 2) estimates causal effects in a manner that permits complex relationships among confounders, exposures, and outcomes; and 3) provides causal estimates that account for uncertainty in the nature of confounding. The proposal relies on specification of multiple Bayesian Additive Regression Trees models, linked together with a common prior distribution that accrues posterior selection probability to covariates on the basis of association with both the exposure and the outcome of interest. A set of extensive simulation studies demonstrates that the proposed method performs well relative to similarly-motivated methodologies in a variety of scenarios. We deploy the method to investigate the causal effect of emissions from coal-fired power plants on ambient air pollution concentrations, where the prospect of confounding due to local and regional meteorological factors introduces uncertainty around the confounding role of a high-dimensional set of measured variables. Ultimately, we show that the proposed method produces more efficient and more consistent results across adjacent years than alternative methods, lending strength to the evidence of the causal relationship between SO2 emissions and ambient particulate pollution.

笔记与分组
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