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arXiv 0810.5655stat.MEstat.ML
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高维分类和数据挖掘中变量选择的Gibbs后验方法

Gibbs posterior for variable selection in high-dimensional classification and data mining

Wenxin Jiang, Martin A. Tanner

摘要:

在流行的“贝叶斯变量选择”(BVS)方法中,使用先验和后验分布来选择候选变量的子集进入模型。一个全新的方向将在这里被认为是研究生物可吸收性与吉布斯后起源于统计力学。吉布斯后验是从实际感兴趣的风险函数(如分类误差)构建的,旨在最小化风险函数,而无需对数据进行概率建模。这可以改善通常的贝叶斯方法的性能,贝叶斯方法依赖于可能被错误指定的概率模型。当候选变量“$K$“的数量远大于样本量“$n$“时,即使在存在高维度的情况下,也将提供实现良好风险性能的条件。“此外,我们开发了一个方便的马尔可夫链蒙特卡罗算法来实现BVS与吉布斯后验。

英文摘要:

In the popular approach of "Bayesian variable selection" (BVS), one uses prior and posterior distributions to select a subset of candidate variables to enter the model. A completely new direction will be considered here to study BVS with a Gibbs posterior originating in statistical mechanics. The Gibbs posterior is constructed from a risk function of practical interest (such as the classification error) and aims at minimizing a risk function without modeling the data probabilistically. This can improve the performance over the usual Bayesian approach, which depends on a probability model which may be misspecified. Conditions will be provided to achieve good risk performance, even in the presence of high dimensionality, when the number of candidate variables "$K$" can be much larger than the sample size "$n$." In addition, we develop a convenient Markov chain Monte Carlo algorithm to implement BVS with the Gibbs posterior.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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