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arXiv 1609.04057math.STstat.COstat.TH
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贝叶斯惩罚回归模型中Gibbs采样器的几何遍历性

Geometric Ergodicity of Gibbs Samplers in Bayesian Penalized Regression Models

Dootika Vats

摘要:

我们考虑三个贝叶斯惩罚回归模型,并表明,各自的确定性扫描吉布斯采样器是几何遍历的回归问题的尺寸无关。我们证明了几何遍历的吉布斯采样贝叶斯融合套索,贝叶斯组套索,和贝叶斯稀疏组套索。几何遍历性与矩条件一起导致蒙特卡罗平均值的马尔可夫链中心极限定理的存在,并确保可靠的输出分析。我们的几何遍历性的结果,使我们也可以提供默认的吉布斯采样器的起始值。

英文摘要:

We consider three Bayesian penalized regression models and show that the respective deterministic scan Gibbs samplers are geometrically ergodic regardless of the dimension of the regression problem. We prove geometric ergodicity of the Gibbs samplers for the Bayesian fused lasso, the Bayesian group lasso, and the Bayesian sparse group lasso. Geometric ergodicity along with a moment condition results in the existence of a Markov chain central limit theorem for Monte Carlo averages and ensures reliable output analysis. Our results of geometric ergodicity allow us to also provide default starting values for the Gibbs samplers.

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