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arXiv 2202.00629math.STstat.TH
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正态分布均值混合的贝叶斯推断与预测

Bayesian inference and prediction for mean-mixtures of normal distributions

Pankaj Bhagwat, Eric Marchand

摘要:

本文研究了多元正态分布均值混合的预测密度估计的频率风险性质,其中包含一个未知的位置参数$θ\in \mathbb{R}^d$,并且包含多元斜正态分布.我们提供明确的表示贝叶斯后验和预测密度,包括基准最小风险同变(MRE)密度,这是极大极小和广义贝叶斯相对于一个不适当的均匀密度$θ$。对于四个维度或更多,我们得到的贝叶斯密度,提高均匀的MRE密度下Kullback-Leibler损失。我们还提供插件类型的改进,调查的影响,某些类型的参数限制$θ$,并说明和评论的结果的基础上数值评估。

英文摘要:

We study frequentist risk properties of predictive density estimators for mean mixtures of multivariate normal distributions, involving an unknown location parameter $θ\in \mathbb{R}^d$, and which include multivariate skew normal distributions. We provide explicit representations for Bayesian posterior and predictive densities, including the benchmark minimum risk equivariant (MRE) density, which is minimax and generalized Bayes with respect to an improper uniform density for $θ$. For four dimensions or more, we obtain Bayesian densities that improve uniformly on the MRE density under Kullback-Leibler loss. We also provide plug-in type improvements, investigate implications for certain type of parametric restrictions on $θ$, and illustrate and comment the findings based on numerical evaluations.

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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