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arXiv 1502.05460math.STstat.TH
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基于$p>N$的贝叶斯线性混合模型块Gibbs抽样的收敛性分析

Convergence analysis of block Gibbs samplers for Bayesian linear mixed models with $p>N$

Tavis Abrahamsen, James P. Hobert

摘要:

探索与一般线性混合模型的贝叶斯版本相关的棘手的后验分布,经常使用马尔可夫链蒙特卡罗。特别地,如果使用条件共轭先验,则存在可用的简单两块吉布斯采样器。Román和Hobert [线性代数Appl. 473(2015)54-77]表明,当先验是适当的并且$X$矩阵具有满列秩时,这些Gibbs采样器下的马尔可夫链几乎总是几何遍历的。在本文中,Román和Hobert(2015)的结果通过允许方差分量上的不适当先验,更重要的是,通过删除$X$矩阵上的所有假设来扩展。因此,$X$不仅允许(列)秩亏,这在参数化固定效应时提供了额外的灵活性,还允许列数多于行数,这在$p>N$越来越重要的情况下是必要的。关于$X$的满秩假设是Román和Hobert(2015)证明的核心。因此,扩展到无限制的$X$需要一个完全不同的分析。

英文摘要:

Exploration of the intractable posterior distributions associated with Bayesian versions of the general linear mixed model is often performed using Markov chain Monte Carlo. In particular, if a conditionally conjugate prior is used, then there is a simple two-block Gibbs sampler available. Román and Hobert [Linear Algebra Appl. 473 (2015) 54-77] showed that, when the priors are proper and the $X$ matrix has full column rank, the Markov chains underlying these Gibbs samplers are nearly always geometrically ergodic. In this paper, Román and Hobert's (2015) result is extended by allowing improper priors on the variance components, and, more importantly, by removing all assumptions on the $X$ matrix. So, not only is $X$ allowed to be (column) rank deficient, which provides additional flexibility in parameterizing the fixed effects, it is also allowed to have more columns than rows, which is necessary in the increasingly important situation where $p>N$. The full rank assumption on $X$ is at the heart of Román and Hobert's (2015) proof. Consequently, the extension to unrestricted $X$ requires a substantially different analysis.

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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