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arXiv 1608.00629stat.ME
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面向稀疏性的高维线性回归重要性学习

Sparsity Oriented Importance Learning for High-dimensional Linear Regression

Chenglong Ye, Yi Yang, Yuhong Yang

摘要:

由于现在公认的不可忽略的模型选择不确定性,数据分析师不应再满足于来自模型选择过程的单个最终模型的输出,而不管其复杂性如何。为了提高模型选择的可靠性和重现性,一个建设性的方法是充分利用一个健全的变量重要性措施。虽然有趣的重要性措施,并越来越多地用于数据分析,很少有理论的理由已经完成。在本文中,我们提出了一种新的变量重要性度量,稀疏导向的重要性学习(SOIL),从稀疏线性建模的角度考虑到变量选择的不确定性,通过使用一个合理的模型加权高维回归。理论上证明了SOIL方法具有包含/排除属性:当模型权重适当地围绕真实模型时,SOIL重要性可以很好地将真实模型中的变量与其他变量分开。特别是,即使信号很弱,SOIL也很少给真实模型中的变量提供比真实模型中的变量显著更高的重要值。广泛的模拟在几个说明性的设置和实际数据的例子与引导模拟显示理想的属性的土壤的重要性相比,其他的重要性措施。

英文摘要:

With now well-recognized non-negligible model selection uncertainty, data analysts should no longer be satisfied with the output of a single final model from a model selection process, regardless of its sophistication. To improve reliability and reproducibility in model choice, one constructive approach is to make good use of a sound variable importance measure. Although interesting importance measures are available and increasingly used in data analysis, little theoretical justification has been done. In this paper, we propose a new variable importance measure, sparsity oriented importance learning (SOIL), for high-dimensional regression from a sparse linear modeling perspective by taking into account the variable selection uncertainty via the use of a sensible model weighting. The SOIL method is theoretically shown to have the inclusion/exclusion property: When the model weights are properly around the true model, the SOIL importance can well separate the variables in the true model from the rest. In particular, even if the signal is weak, SOIL rarely gives variables not in the true model significantly higher important values than those in the true model. Extensive simulations in several illustrative settings and real data examples with guided simulations show desirable properties of the SOIL importance in contrast to other importance measures.

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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