General maximum likelihood empirical Bayes estimation of normal means
正态均值的一般最大似然经验贝叶斯估计AI 解读 ↓
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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 ℓp balls when the order of the length-normalized norm of the unknown means is between (log n)κ1/n1/(p∧2) and n/(log n)κ2. 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.