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arXiv 2101.00366math.STstat.TH
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马蹄形及其正则化变体Gibbs采样器的几何遍历性

Geometric ergodicity of Gibbs samplers for the Horseshoe and its regularized variants

Suman K. Bhattacharya, Kshitij Khare, Subhadip Pal

摘要:

马蹄铁是高维贝叶斯线性回归中广泛使用的一种连续收缩先验。最近,正则化版本的马蹄事先也已在文献中介绍。在文献中已经开发了各种吉布斯采样马尔可夫链,以从相应的难处理的后验密度生成近似样本。建立这些马尔可夫链的几何遍历性为基于马尔可夫链的后验量估计的渐近标准误差的准确性提供了关键的技术依据。在本文中,我们建立了几何遍历对应于马蹄先验及其正则化变量的线性回归的背景下,各种吉布斯采样。首先,我们建立了几何遍历的吉布斯采样器的原始马蹄后严格弱于现有的分析文献中的条件下。其次,我们考虑了Piironen和Vehtari(2017)中引入的正则化马蹄先验,并证明了Gibbs采样马尔可夫链从相应的后验中采样的几何遍历性,而无需对全局和局部收缩参数进行任何截断约束。最后,我们考虑Nishimura和Suchard(2020)中引入的正则化马蹄先验的一个变体,并再次建立Gibbs采样马尔可夫链的几何遍历性,以从相应的后验中采样。

英文摘要:

The Horseshoe is a widely used and popular continuous shrinkage prior for high-dimensional Bayesian linear regression. Recently, regularized versions of the Horseshoe prior have also been introduced in the literature. Various Gibbs sampling Markov chains have been developed in the literature to generate approximate samples from the corresponding intractable posterior densities. Establishing geometric ergodicity of these Markov chains provides crucial technical justification for the accuracy of asymptotic standard errors for Markov chain based estimates of posterior quantities. In this paper, we establish geometric ergodicity for various Gibbs samplers corresponding to the Horseshoe prior and its regularized variants in the context of linear regression. First, we establish geometric ergodicity of a Gibbs sampler for the original Horseshoe posterior under strictly weaker conditions than existing analyses in the literature. Second, we consider the regularized Horseshoe prior introduced in Piironen and Vehtari (2017), and prove geometric ergodicity for a Gibbs sampling Markov chain to sample from the corresponding posterior without any truncation constraint on the global and local shrinkage parameters. Finally, we consider a variant of this regularized Horseshoe prior introduced in Nishimura and Suchard (2020), and again establish geometric ergodicity for a Gibbs sampling Markov chain to sample from the corresponding posterior.

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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