SURE estimates under dependence and heteroscedasticity
SURE estimates under dependence and heteroscedasticity
复制标题
依赖性和异方差下的 SURE 估计
DOI:
10.1016/j.jmva.2017.07.001
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发表时间:
2017-09
影响因子:
1.6
通讯作者:
Wang Zhou
中科院分区:
文献类型:
--
作者:
Xinbing Kong;Zhi Liu;Peng Zhao;Wang Zhou
The multivariate Bayesian hierarchical model with independent means has been studied extensively and is widely used in practice. In contrast, the case of dependent means has received scant attention, even though multivariate observations are often correlated. In this paper, we investigate a multivariate heteroscedastic Bayesian hierarchical model in which an informative prior with equicorrelated means is assumed. We estimate the mean vector by the shrinkage estimator based on Stein’s unbiased risk estimation (SURE). It is shown that the squared error loss of the SURE estimator is close to that of an oracle estimator as the number of means grows. Our SURE estimator includes the SURE estimator under independence considered by Xie et al. (2012) as a special case. The finite-sample performance of our estimator is explored via simulations and two real data sets are used for illustration purposes.
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