Using distance covariance for improved variable selection with application to learning genetic risk models.

Using distance covariance for improved variable selection with application to learning genetic risk models.
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DOI:
10.1002/sim.6441
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发表时间:
2015-05-10
影响因子:
2
通讯作者:
Wahba, Grace
Wahba, Grace
中科院分区:
医学3区
文献类型:
--
作者:
Kong, Jing;Wang, Sijian;Wahba, Grace

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在许多科学领域中,变量选择对于解决高维问题越来越重要。在本文中,我们证明了距离协方差的属性,它被纳入一个新的功能筛选过程中使用的距离相关。该方法没有分布假设的变量,不需要规范的回归模型,因此是特别有吸引力的变量选择给定的候选属性的数量巨大,而没有太多的信息与响应的真实模型。该方法被应用到两个遗传风险问题,其中问题包括通过交叉验证变量选择的不确定性,分组的难以分类的情况下,拒绝选项的应用进行了讨论。
Variable selection is of increasing importance to address the difficulties of high dimensionality in many scientific areas. In this paper, we demonstrate a property for distance covariance, which is incorporated in a novel feature screening procedure together with the use of distance correlation. The approach makes no distributional assumptions for the variables and does not require the specification of a regression model, and hence is especially attractive in variable selection given an enormous number of candidate attributes without much information about the true model with the response. The method is applied to two genetic risk problems, where issues including uncertainty of variable selection via cross validation, subgroup of hard-to-classify cases and the application of a reject option are discussed.
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