arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2409.06288stat.ME
收藏

通过回归合成的集成双重稳健贝叶斯推断

Ensemble Doubly Robust Bayesian Inference via Regression Synthesis

Kaoru Babasaki, Shonosuke Sugasawa, Kosaku Takanashi, Kenichiro McAlinn

AI总结:

针对倾向得分与结果模型均可能错误设定的问题,本文提出双重稳健贝叶斯回归合成方法,通过个体自适应集成权重提升因果效应估计的稳健性与不确定性量化能力。

摘要:

双重稳健估计量同时对倾向得分和结果进行建模,是潜在结果设定下估计平均处理效应的一种常用方法。该估计量的主要吸引力在于其理论性质:只要倾向得分或结果中任一项被正确设定,估计量就具有一致性。然而,在大多数应用中,两者均被错误设定,从而导致无法检查的显著偏差。本文提出一种贝叶斯集成方法,对倾向得分和结果的多个模型进行合成,我们称之为双重稳健贝叶斯回归合成。该方法对在个体层面自适应的集成模型权重应用贝叶斯更新,纳入数据异质性,以显著缓解错误设定偏差。在理论上,我们证明所提方法在倾向得分和结果的估计上均具有一致性,从而即使在没有任何单一模型被正确设定时,也能确保双重稳健估计量具有一致性。一种用于后验计算的高效算法有助于刻画处理效应的不确定性。通过两项全面的模拟研究,我们将所提方法与标准方法及最先进方法进行比较,发现该方法在所有情形下均表现更优。一项关于母亲吸烟对出生体重影响的实证研究突显了所提方法的实际适用性。

英文摘要:

The doubly robust estimator, which models both the propensity score and outcomes, is a popular approach to estimate the average treatment effect in the potential outcome setting. The primary appeal of this estimator is its theoretical property, wherein the estimator achieves consistency as long as either the propensity score or outcomes is correctly specified. In most applications, however, both are misspecified, leading to considerable bias that cannot be checked. In this paper, we propose a Bayesian ensemble approach that synthesizes multiple models for both the propensity score and outcomes, which we call doubly robust Bayesian regression synthesis. Our approach applies Bayesian updating to the ensemble model weights that adapt at the unit level, incorporating data heterogeneity, to significantly mitigate misspecification bias. Theoretically, we show that our proposed approach is consistent regarding the estimation of both the propensity score and outcomes, ensuring that the doubly robust estimator is consistent, even if no single model is correctly specified. An efficient algorithm for posterior computation facilitates the characterization of uncertainty regarding the treatment effect. Our proposed approach is compared against standard and state-of-the-art methods through two comprehensive simulation studies, where we find that our approach is superior in all cases. An empirical study on the impact of maternal smoking on birth weight highlights the practical applicability of our proposed method.

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。

↑