arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2401.00749stat.COmath.PR
收藏

广义逆高斯分布的性质及其在蒙特卡洛模拟和分布函数评估中的应用

Properties of the generalized inverse Gaussian with applications to Monte Carlo simulation and distribution function evaluation

Victor Peña, Michael Jauch

AI总结:

本文提出广义逆高斯分布的两种混合表示,分别用于构建几何遍历的GIBBS抽样器及实现半整数参数下的精确采样和CDF评估,并展示了其应用示例。

摘要:

广义逆高斯分布,记为$\mathrm{GIG}(p, a, b)$,是一个灵活的分布族,包含伽马分布、逆伽马分布和逆高斯分布作为特例。除了在统计建模中的应用和理论价值外,GIG在计算统计中经常出现,特别是在用于后验推断的马尔可夫链蒙特卡洛(MCMC)算法中。本文介绍了GIG的两种混合表示:一种将分布表示为逆高斯分布的连续混合,另一种揭示了不同$p$值的GIG之间的递推关系。前一种表示构成了一种数据增广方案的基础,该方案导致了一个几何遍历的GIBBS抽样器。这个简单的GIBBS抽样器在伽马分布和逆高斯分布的条件分布之间交替,可以在需要从GIG模拟时纳入一个包含性的MCMC算法中。后一种表示导致了精确、无拒绝的抽样算法以及半整数$p$的GIG的CDF评估算法。我们强调了文献中这些新算法可以应用的计算示例。

英文摘要:

The generalized inverse Gaussian, denoted $\mathrm{GIG}(p, a, b)$, is a flexible family of distributions that includes the gamma, inverse gamma, and inverse Gaussian distributions as special cases. In addition to its applications in statistical modeling and its theoretical interest, the GIG often arises in computational statistics, especially in Markov chain Monte Carlo (MCMC) algorithms for posterior inference. This article introduces two mixture representations for the GIG: one that expresses the distribution as a continuous mixture of inverse Gaussians and another that reveals a recursive relationship between GIGs with different values of $p$. The former representation forms the basis for a data augmentation scheme that leads to a geometrically ergodic Gibbs sampler for the GIG. This simple Gibbs sampler, which alternates between gamma and inverse Gaussian conditional distributions, can be incorporated within an encompassing MCMC algorithm when simulation from a GIG is required. The latter representation leads to algorithms for exact, rejection-free sampling as well as CDF evaluation for the GIG with half-integer $p.$ We highlight computational examples from the literature where these new algorithms could be applied.

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。

↑