Bayesian Fusion Estimation via t Shrinkage
Bayesian Fusion Estimation via t Shrinkage
复制标题
通过 t 收缩进行贝叶斯融合估计
DOI:
10.1007/s13171-019-00177-0
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发表时间:
2020
期刊:
影响因子:
--
通讯作者:
Cheng, Guang
中科院分区:
文献类型:
--
作者:
Song, Qifan;Cheng, Guang
Shrinkage prior has gained great successes in many data analysis, however, its applications mostly focus on the Bayesian modeling of sparse parameters. In this work, we will apply Bayesian shrinkage to model high dimensional parameter that possesses an unknown blocking structure. We propose to impose heavy-tail shrinkage prior, e.g.,tprior, on the differences of successive parameter entries, and such a fusion prior will shrink successive differences towards zero and hence induce posterior blocking. Comparing to conventional Bayesian fused LASSO which implements Laplace fusion prior,tfusion prior induces stronger shrinkage effect and enjoys a nice posterior consistency property. Simulation studies and real data analyses show thattfusion has superior performance to the frequentist fusion estimator and Bayesian Laplace fusion prior. Thistfusion strategy is further developed to conduct a Bayesian clustering analysis, and our simulations show that the proposed algorithm compares favorably to classical Dirichlet process modeling.
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