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arXiv 0903.5474math.STstat.TH
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高维部分线性模型中的SCAD惩罚回归

SCAD-penalized regression in high-dimensional partially linear models

Huiliang Xie, Jian Huang

摘要:

在部分线性模型中,在线性部分协变量个数不同的情况下,在回归系数向量稀疏的假设下,考虑了变量的同时选择和估计问题.我们应用SCAD惩罚来实现线性部分的稀疏性,并使用多项式样条来估计非参数分量。在合理的条件下,它表明,在变量的选择和估计方面的一致性,可以同时实现的线性和非参数成分。此外,非零系数的SCAD惩罚估计具有渐近预言性质,在这个意义上,它是渐近正态的,具有相同的均值和协方差,如果零系数是已知的。SCAD惩罚估计的有限样本行为进行了评估与模拟和说明的数据集。

英文摘要:

We consider the problem of simultaneous variable selection and estimation in partially linear models with a divergent number of covariates in the linear part, under the assumption that the vector of regression coefficients is sparse. We apply the SCAD penalty to achieve sparsity in the linear part and use polynomial splines to estimate the nonparametric component. Under reasonable conditions, it is shown that consistency in terms of variable selection and estimation can be achieved simultaneously for the linear and nonparametric components. Furthermore, the SCAD-penalized estimators of the nonzero coefficients are shown to have the asymptotic oracle property, in the sense that it is asymptotically normal with the same means and covariances that they would have if the zero coefficients were known in advance. The finite sample behavior of the SCAD-penalized estimators is evaluated with simulation and illustrated with a data set.

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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