arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2009.11409stat.AP
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高维中介分析中相关中介协调选择的贝叶斯层次模型

Bayesian Hierarchical Models for High-Dimensional Mediation Analysis with Coordinated Selection of Correlated Mediators

Yanyi Song, Xiang Zhou, Jian Kang, Max T. Aung, Min Zhang, Wei Zhao, Belinda L. Needham, Sharon L. R. Kardia, Yongmei Liu, John D. Meeker, Jennifer A. Smith, Bhramar Mukherjee

摘要:

我们认为贝叶斯高维中介分析,以确定在一个大的相关的潜在介质的活跃的介导的影响,从暴露变量的利益的结果。在现代数据分析中经常观察到介质之间的相关性;例子包括大脑图像数据中连接区域内的激活体素、基因组数据中基因网络驱动的调节信号以及来自相同来源的相关暴露数据。当活性介体之间存在相关性时,不能考虑这种相关性的中介分析可能是次优的,并且可能导致在识别活性介体方面的能力损失。最近的高维中介分析框架的基础上,我们提出了两个贝叶斯分层模型,一个高斯混合物之前,使相关的中介选择和其他与Potts混合物之前,占活跃的中介之间的相关性在中介分析。我们为这两种方法开发了有效的采样算法。各种模拟表明,我们的方法能够有效地识别相关的活性介质,这可能是错过了使用现有的方法,假设事先独立的活性介质。所提出的方法适用于LIFECODES出生队列和多种族研究的动脉粥样硬化(MESA),并确定了新的活性介质具有重要的生物学意义。

英文摘要:

We consider Bayesian high-dimensional mediation analysis to identify among a large set of correlated potential mediators the active ones that mediate the effect from an exposure variable to an outcome of interest. Correlations among mediators are commonly observed in modern data analysis; examples include the activated voxels within connected regions in brain image data, regulatory signals driven by gene networks in genome data and correlated exposure data from the same source. When correlations are present among active mediators, mediation analysis that fails to account for such correlation can be sub-optimal and may lead to a loss of power in identifying active mediators. Building upon a recent high-dimensional mediation analysis framework, we propose two Bayesian hierarchical models, one with a Gaussian mixture prior that enables correlated mediator selection and the other with a Potts mixture prior that accounts for the correlation among active mediators in mediation analysis. We develop efficient sampling algorithms for both methods. Various simulations demonstrate that our methods enable effective identification of correlated active mediators, which could be missed by using existing methods that assume prior independence among active mediators. The proposed methods are applied to the LIFECODES birth cohort and the Multi-Ethnic Study of Atherosclerosis (MESA) and identified new active mediators with important biological implications.

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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