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• W2615708464 abstract "A nonparametric Bayes approach is proposed for the problem of estimating a sparse sequence based on Gaussian random variables. We adopt the popular two-group prior with one component being a point mass at zero, and the other component being a mixture of Gaussian distributions. Although the Gaussian family has been shown to be suboptimal for this problem, we find that Gaussian mixtures, with a proper choice on the means and mixing weights, have the desired asymptotic behavior, e.g., the corresponding posterior concentrates on balls with the desired minimax rate. To achieve computation efficiency, we propose to obtain the posterior distribution using a deterministic variational algorithm. Empirical studies on several benchmark data sets demonstrate the superior performance of the proposed algorithm compared to other alternatives." @default.
• W2615708464 created "2017-05-26" @default.
• W2615708464 creator A5063937173 @default.
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• W2615708464 date "2017-02-14" @default.
• W2615708464 modified "2023-10-16" @default.
• W2615708464 title "A Nonparametric Bayesian Approach for Sparse Sequence Estimation" @default.
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