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arXiv 0908.1709math.STstat.TH
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正态均值的广义极大似然经验Bayes估计

General maximum likelihood empirical Bayes estimation of normal means

Wenhua Jiang, Cun-Hui Zhang

摘要:

本文提出了一种基于独立同分布观测值的均值向量估计的广义极大似然经验贝叶斯(GMLEB)方法。正常错误。我们证明了在温和的矩条件下的未知手段,平均均方误差(MSE)的GMLEB是在一个无穷小的分数的最小平均MSE之间的所有可分离的估计,使用一个单一的确定性估计函数对个人的意见,提供的风险是更大的顺序比$(\log n)^5/n$。我们还证明了当未知均值的长度归一化范数的阶介于$(\log n)^{κ_1}/n^{1/(p\wedge2)}$和$n/(\log n)^{κ_2}$之间时,GMLEB在正则和弱$\ell_p$球中是一致近似极小极大的。仿真实验表明,GMLEB在广泛的设置下优于James-Stein和几种最先进的阈值估计器,并且没有太大的缺点。

英文摘要:

We propose a general maximum likelihood empirical Bayes (GMLEB) method for the estimation of a mean vector based on observations with i.i.d. normal errors. We prove that under mild moment conditions on the unknown means, the average mean squared error (MSE) of the GMLEB is within an infinitesimal fraction of the minimum average MSE among all separable estimators which use a single deterministic estimating function on individual observations, provided that the risk is of greater order than $(\log n)^5/n$. We also prove that the GMLEB is uniformly approximately minimax in regular and weak $\ell_p$ balls when the order of the length-normalized norm of the unknown means is between $(\log n)^{κ_1}/n^{1/(p\wedge2)}$ and $n/(\log n)^{κ_2}$. Simulation experiments demonstrate that the GMLEB outperforms the James--Stein and several state-of-the-art threshold estimators in a wide range of settings without much down side.

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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