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arXiv 1904.02415math.STstat.TH
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多元正态性的贝叶斯非参数检验

A Bayesian Nonparametric Test for Assessing Multivariate Normality

Luai Al-Labadi, Forough Fazeli Asl, Zahra Saberi

摘要:

本文提出了一种新的贝叶斯非参数检验方法来检验多元正态模型。虽然有广泛的频率论和图解法用于检验多元正态性,但找到贝叶斯对应方法是具有挑战性的。所提出的方法是基于使用的狄利克雷过程和马哈拉诺比斯距离。更准确地说,马哈拉诺比斯距离被用作将$m$ -变量问题转化为单变量问题的良好技术。然后Dirichlet过程被用作马哈拉诺比斯距离分布的先验。通过相对置信比,将后处理与具有$m$自由度的χ 2分布之间的距离的分布的集中度与前处理与具有$m$自由度的χ 2分布之间的距离的分布的集中度进行比较。基于Anderson-Darling距离建立了Dirichlet过程与χ 2分布之间的距离。该方法的关键理论结果的推导。通过几个例子说明了该过程,其中所提出的方法表现出优异的性能。

英文摘要:

In this paper, a novel Bayesian nonparametric test for assessing multivariate normal models is presented. While there are extensive frequentist and graphical methods for testing multivariate normality, it is challenging to find Bayesian counterparts. The proposed approach is based on the use of the Dirichlet process and Mahalanobis distance. More precisely, the Mahalanobis distance is employed as a good technique to transform the $m$-variate problem into a univariate problem. Then the Dirichlet process is used as a prior on the distribution of the Mahalanobis distance. The concentration of the distribution of the distance between the posterior process and the chi-square distribution with $m$ degrees of freedom is compared to the concentration of the distribution of the distance between the prior process and the chi-square distribution with $m$ degrees of freedom via a relative belief ratio. The distance between the Dirichlet process and the chi-square distribution is established based on the Anderson-Darling distance. Key theoretical results of the approach are derived. The procedure is illustrated through several examples, in which the proposed approach shows excellent performance.

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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