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• W2907058045 abstract "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., $t$ prior, 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, $t$ fusion prior induces stronger shrinkage effect and enjoys a nice posterior consistency property. Simulation studies and real data analyses show that $t$ fusion has superior performance to the frequentist fusion estimator and Bayesian Laplace-fusion prior. This $t$-fusion strategy is further developed to conduct a Bayesian clustering analysis, and simulation shows that the proposed algorithm obtains better posterior distributional convergence than the classical Dirichlet process modeling." @default.
• W2907058045 created "2019-01-11" @default.
• W2907058045 creator A5005876602 @default.
• W2907058045 creator A5042490620 @default.
• W2907058045 date "2018-12-26" @default.
• W2907058045 modified "2023-09-26" @default.
• W2907058045 title "Bayesian Fusion Estimation via t-Shrinkage" @default.
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• W2907058045 doi "https://doi.org/10.48550/arxiv.1812.10594" @default.
• W2907058045 hasPublicationYear "2018" @default.
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