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arXiv 1909.00698stat.COcs.NAmath.NAq-fin.CP
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Fourier变换MCMC、重尾分布和几何遍历性

Fourier transform MCMC, heavy tailed distributions and geometric ergodicity

Denis Belomestny, Leonid Iosipoi

摘要:

马尔可夫链蒙特卡罗方法在应用数学中作为一种对复杂和高维分布进行数值积分的工具变得越来越流行。然而,MCMC方法的应用重尾分布和分布的分析棘手的密度证明是相当成问题的。在本文中,我们提出了一种新的方法对使用MCMC算法的分布与分析已知的傅立叶变换,特别是重尾分布。该方法的主要思想是在傅立叶域中使用MCMC方法,从与底层特征函数的绝对值成比例的密度中采样。随后的应用程序的Parseval的公式导致一个有效的算法计算积分的基础密度。我们证明了即使在重尾原始分布的情况下,所得到的傅立叶域中的马尔可夫链也可能是几何遍历的。我们说明了我们的方法,包括多变量椭圆轮廓稳定分布的几个数值例子。

英文摘要:

Markov Chain Monte Carlo methods become increasingly popular in applied mathematics as a tool for numerical integration with respect to complex and high-dimensional distributions. However, application of MCMC methods to heavy tailed distributions and distributions with analytically intractable densities turns out to be rather problematic. In this paper, we propose a novel approach towards the use of MCMC algorithms for distributions with analytically known Fourier transforms and, in particular, heavy tailed distributions. The main idea of the proposed approach is to use MCMC methods in Fourier domain to sample from a density proportional to the absolute value of the underlying characteristic function. A subsequent application of the Parseval's formula leads to an efficient algorithm for the computation of integrals with respect to the underlying density. We show that the resulting Markov chain in Fourier domain may be geometrically ergodic even in the case of heavy tailed original distributions. We illustrate our approach by several numerical examples including multivariate elliptically contoured stable distributions.

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