arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2602.20115math.STecon.EMstat.MEstat.TH
收藏

复合决策与经验贝叶斯方法 via 贝叶斯非参数方法

Compound decisions and empirical Bayes via Bayesian nonparametrics

University of Chicago(芝加哥大学)

Nikolaos Ignatiadis, Sid Kankanala

AI总结:

本文通过贝叶斯非参数方法研究高斯序列复合决策问题,证明基于狄利克雷过程的估计器可实现接近最优的懊悔界,并展示后验均值贝叶斯规则的可接受性。

摘要:

我们研究了高斯序列复合决策问题,并从经验贝叶斯和懊悔角度分析了一个贝叶斯非参数估计器。受经典非参数最大似然估计器(NPMLE)的精确结果启发,我们询问是否可以使用标准的贝叶斯非参数先验获得类似的保证。我们证明,基于狄利克雷过程的贝叶斯程序可以实现接近最优的懊悔界。我们的主要结果是在复合决策框架中提出的,其中均值向量被视为固定,同时我们还提供了在分层模型中均值从真实未知先验分布中抽取的平行保证。后验均值贝叶斯规则本质上是可接受的,而我们证明NPMLE插件规则是不可接受的。

英文摘要:

We study compound decision theory from a nonparametric Bayesian perspective, with particular emphasis on their relationship to empirical Bayes (EB) procedures. Motivated by the sharp risk guarantees available for EB procedures based on the nonparametric maximum likelihood estimator (NPMLE), we investigate whether analogous guarantees can be established for fully Bayesian decision rules. In a class of Gaussian compound decision problems, we show that the fully Bayesian posterior mean achieves near-optimal risk. Moreover, it is admissible as a genuine Bayes rule, whereas the corresponding NPMLE plug-in rule is inadmissible. Simulations illustrate the performance of nonparametric Bayes procedures relative to common alternatives. As an application, we apply our methodology to Census tract-level estimates of economic mobility from the Opportunity Atlas.

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。

↑