Optimal shrinkage estimation in heteroscedastic hierarchical linear models
Optimal shrinkage estimation in heteroscedastic hierarchical linear models
复制标题
异方差分层线性模型中的最优收缩估计
DOI:
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复制
发表时间:
2015
期刊:
影响因子:
--
通讯作者:
Justin Yang
中科院分区:
文献类型:
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作者:
S. Kou;Justin Yang
Shrinkage estimators have profound impacts in statistics and in scientific and engineering applications. In this article, we consider shrinkage estimation in the presence of linear predictors. We formulate two heteroscedastic hierarchical regression models and study optimal shrinkage estimators in each model. A class of shrinkage estimators, both parametric and semiparametric, based on unbiased risk estimate (URE) is proposed and is shown to be (asymptotically) optimal under mean squared error loss in each model. Simulation study is conducted to compare the performance of the proposed methods with existing shrinkage estimators. We also apply the method to real data and obtain encouraging and interesting results.
影响因子:
4.5
作者:
Xie,Xianchao;Kou,SC;Brown,Lawrence
通讯作者:
Brown,Lawrence