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arXiv 1402.4733math.PR
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分层Gibbs抽样的收敛速度

Convergence Rates for Hierarchical Gibbs Samplers

Oliver Jovanovski, Neal Madras

摘要:

我们建立了Gibbs抽样的全变差收敛到其平衡分布的速度的一些结果。这个采样器是由一个伽玛随机变量的分层贝叶斯推理结构的动机。我们的结果适用于广泛的参数值的情况下,层次深度为3或4,深度大于4的限制性更强。我们的方法包括显示我们的链的两个有序副本的全变差和它们各自的坐标的比率的最大值之间的关系。我们构造辅助随机过程,以表明该比率确实以几何速率收敛到1。

英文摘要:

We establish some results for the rate of convergence in total variation of a Gibbs sampler to its equilibrium distribution. This sampler is motivated by a hierarchical Bayesian inference construction for a gamma random variable. Our results apply to a wide range of parameter values in the case that the hierarchical depth is 3 or 4, and are more restrictive for depth greater than 4. Our method involves showing a relationship between the total variation of two ordered copies of our chain and the maximum of the ratios of their respective co-ordinates. We construct auxiliary stochastic processes to show that this ratio does converge to 1 at a geometric rate.

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