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arXiv 1306.6557stat.MLmath.STstat.TH
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高维判别分析中的最优特征选择

Optimal Feature Selection in High-Dimensional Discriminant Analysis

Mladen Kolar, Han Liu

摘要:

我们考虑高维判别分析问题。对于这个问题,已经提出了不同的方法,并通过建立分类风险的精确收敛速度以及判别规则的l2收敛结果来证明。然而,尖锐的理论分析,这些程序的变量选择性能尚未建立,即使模型解释是科学数据分析的根本重要性。本文通过使用稀疏判别分析(Mai et al.,2012年)。通过仔细的分析,我们建立的收敛速度显着快于最知名的结果,并承认一个最佳的缩放的样本量n,维数p,和稀疏水平s的高维设置。在高维判别分析的背景下,变量选择问题的充分条件的补充必要的信息理论的限制。利用数值等价结果,我们的方法还建立了ROAD估计量的最佳结果(Fan等人,2012)和稀疏最优缩放估计器(Clemmensen等人,2011年)。此外,我们分析了一个穷举搜索过程,其性能作为一个基准,并表明它是变量选择一致的条件下较弱。还提供了大量的模拟,证明边界的清晰度。

英文摘要:

We consider the high-dimensional discriminant analysis problem. For this problem, different methods have been proposed and justified by establishing exact convergence rates for the classification risk, as well as the l2 convergence results to the discriminative rule. However, sharp theoretical analysis for the variable selection performance of these procedures have not been established, even though model interpretation is of fundamental importance in scientific data analysis. This paper bridges the gap by providing sharp sufficient conditions for consistent variable selection using the sparse discriminant analysis (Mai et al., 2012). Through careful analysis, we establish rates of convergence that are significantly faster than the best known results and admit an optimal scaling of the sample size n, dimensionality p, and sparsity level s in the high-dimensional setting. Sufficient conditions are complemented by the necessary information theoretic limits on the variable selection problem in the context of high-dimensional discriminant analysis. Exploiting a numerical equivalence result, our method also establish the optimal results for the ROAD estimator (Fan et al., 2012) and the sparse optimal scaling estimator (Clemmensen et al., 2011). Furthermore, we analyze an exhaustive search procedure, whose performance serves as a benchmark, and show that it is variable selection consistent under weaker conditions. Extensive simulations demonstrating the sharpness of the bounds are also provided.

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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