arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1809.10652stat.MEmath.STstat.MLstat.TH
收藏

稀疏高维因果图模型中个体中介效应和干预效应的推断

Inference for Individual Mediation Effects and Interventional Effects in Sparse High-Dimensional Causal Graphical Models

Abhishek Chakrabortty, Preetam Nandy, Hongzhe Li

摘要:

我们考虑的问题,确定中间变量(或介质),调节治疗的效果对反应变量。虽然已经有了显着的研究,这个经典的话题,很少的工作已经做了一套潜在的调解人是高维(HD)。当这些介质相互关联(具有未知的依赖性)时,会出现进一步的复杂性。特别是,我们假设治疗的因果结构,混杂因素,潜在的介质和反应是一个(可能是未知的)有向无环图(DAG)。HD DAG模型以前曾用于估计观测数据的因果效应。特别是,称为IDA和联合IDA的方法已经分别开发用于估计单一和多个同时干预的效果。在本文中,我们提出了一个IDA型的方法,称为MIDA的估计所谓的个人中介作用,从HD观测数据。虽然IDA和联合IDA估计已被证明是一致的,在某些稀疏HD设置,其渐近性质,如依分布收敛和推理工具,在这样的设置仍然未知。本文证明了具有亚高斯误差的线性结构方程模型的MIDA的HD相合性。更重要的是,我们得出分布收敛结果MIDA在类似的HD设置,这是适用于IDA和联合IDA估计以及。据我们所知,这是第一个这样的分布收敛的结果,便于推断IDA型估计。这些都是建立在我们的新的理论结果,关于统一的界限线性回归估计在不同的子集HD协变量,这可能是独立的利益。最后,我们经验验证我们的渐近理论MIDA,并通过模拟和实际数据的应用证明其实用性。

英文摘要:

We consider the problem of identifying intermediate variables (or mediators) that regulate the effect of a treatment on a response variable. While there has been significant research on this classical topic, little work has been done when the set of potential mediators is high-dimensional (HD). A further complication arises when these mediators are interrelated (with unknown dependencies). In particular, we assume that the causal structure of the treatment, the confounders, the potential mediators and the response is a (possibly unknown) directed acyclic graph (DAG). HD DAG models have previously been used for the estimation of causal effects from observational data. In particular, methods called IDA and joint-IDA have been developed for estimating the effects of single and multiple simultaneous interventions, respectively. In this paper, we propose an IDA-type method called MIDA for estimating so-called individual mediation effects from HD observational data. Although IDA and joint-IDA estimators have been shown to be consistent in certain sparse HD settings, their asymptotic properties such as convergence in distribution and inferential tools in such settings have remained unknown. In this paper, we prove HD consistency of MIDA for linear structural equation models with sub-Gaussian errors. More importantly, we derive distributional convergence results for MIDA in similar HD settings, which are applicable to IDA and joint-IDA estimators as well. To our knowledge, these are the first such distributional convergence results facilitating inference for IDA-type estimators. These are built on our novel theoretical results regarding uniform bounds for linear regression estimators over varying subsets of HD covariates which may be of independent interest. Finally, we empirically validate our asymptotic theory for MIDA and demonstrate its usefulness via simulations 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。

↑