On constrained and regularized high-dimensional regression.
On constrained and regularized high-dimensional regression.
复制标题
在受约束和正规化的高维回归上。
DOI:
10.1007/s10463-012-0396-3
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发表时间:
2013-10
影响因子:
1
通讯作者:
Zhou, Hui
中科院分区:
文献类型:
--
作者:
Shen, Xiaotong;Pan, Wei;Zhu, Yunzhang;Zhou, Hui
关键词:
High-dimensional feature selection has become increasingly crucial for seeking parsimonious models in estimation. For selection consistency, we derive one necessary and sufficient condition formulated on the notion of degree-of-separation. The minimal degree of separation is necessary for any method to be selection consistent. At a level slightly higher than the minimal degree of separation, selection consistency is achieved by a constrained L0-method and its computational surrogate–the constrained truncated L1-method. This permits up to exponentially many features in the sample size. In other words, these methods are optimal in feature selection against any selection method. In contrast, their regularization counterparts–the L0-regularization and truncated L1-regularization methods enable so under slightly stronger assumptions. More importantly, sharper parameter estimation/prediction is realized through such selection, leading to minimax parameter estimation. This, otherwise, is impossible in absence of a good selection method for high-dimensional analysis.
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