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arXiv 1503.06155math.STstat.TH
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模型维数增长时非嵌套模型选择Bayes因子的一致性

Consistency of Bayes factor for nonnested model selection when the model dimension grows

Min Wang, Yuzo Maruyama

摘要:

Zellner的$g$ -先验是正态回归模型中模型选择问题的一种常用先验选择。Wang和Sun [J. Statistist.计划Inference 147(2014)95-105]最近采用了这种先验,并为$g$设置了一个特殊的超先验,这导致了嵌套线性模型比较的贝叶斯因子的封闭形式表达式。他们已经证明,在非常一般的条件下,当两个竞争模型具有$O(n^τ)$阶时,贝叶斯因子是一致的,对于$τ<1$和对于$τ=1$,除了原假设周围的一个小的不一致区域外,几乎是一致的。本文研究了具有增长参数的非嵌套线性模型的Bayes因子相合性。其中一些结果推广了嵌套线性模型的Bayes因子的结果。具体来说,我们比较了文献中提出的贝叶斯因子和内在贝叶斯因子之间的渐近行为。

英文摘要:

Zellner's $g$-prior is a popular prior choice for the model selection problems in the context of normal regression models. Wang and Sun [J. Statist. Plann. Inference 147 (2014) 95-105] recently adopt this prior and put a special hyper-prior for $g$, which results in a closed-form expression of Bayes factor for nested linear model comparisons. They have shown that under very general conditions, the Bayes factor is consistent when two competing models are of order $O(n^τ)$ for $τ<1$ and for $τ=1$ is almost consistent except a small inconsistency region around the null hypothesis. In this paper, we study Bayes factor consistency for nonnested linear models with a growing number of parameters. Some of the proposed results generalize the ones of the Bayes factor for the case of nested linear models. Specifically, we compare the asymptotic behaviors between the proposed Bayes factor and the intrinsic Bayes factor in the literature.

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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