arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2004.13991stat.ME
收藏

具有偏差的稳健贝叶斯估计的缺省先验

On default priors for robust Bayesian estimation with divergences

Tomoyuki Nakagawa, Shintaro Hashimoto

摘要:

本文提出了基于分歧的抗野值贝叶斯估计的客观先验。最小$γ$ -散度估计是众所周知的工作,以及对严重污染的估计。近年来,基于分歧的准后验分布的稳健贝叶斯方法也被提出。在客观贝叶斯框架下,在这种准后验分布下,违约先验分布的选择是一个重要问题。本文基于$γ$ -散度,给出了准后验分布下参考先验和矩匹配先验的一些性质。特别是,我们表明,所提出的先验近似鲁棒的污染分布的条件下,不假设任何条件的污染率。一些模拟研究也被提出。

英文摘要:

This paper presents objective priors for robust Bayesian estimation against outliers based on divergences. The minimum $γ$-divergence estimator is well-known to work well estimation against heavy contamination. The robust Bayesian methods by using quasi-posterior distributions based on divergences have been also proposed in recent years. In objective Bayesian framework, the selection of default prior distributions under such quasi-posterior distributions is an important problem. In this study, we provide some properties of reference and moment matching priors under the quasi-posterior distribution based on the $γ$-divergence. In particular, we show that the proposed priors are approximately robust under the condition on the contamination distribution without assuming any conditions on the contamination ratio. Some simulation studies are also presented.

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。

↑