Stein COnsistent Risk Estimator (SCORE) for hard thresholding
Stein COnsistent Risk Estimator (SCORE) for hard thresholding
复制标题
用于硬阈值的 Stein 一致风险估计器 (SCORE)
DOI:
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发表时间:
2013
期刊:
影响因子:
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通讯作者:
J. Fadili
中科院分区:
文献类型:
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作者:
Charles;G. Peyr'e;J. Fadili
In this work, we construct a risk estimator for hard thresholding which can be used as a basis to solve the difficult task of automatically selecting the threshold. As hard thresholding is not even continuous, Stein's lemma cannot be used to get an unbiased estimator of degrees of freedom, hence of the risk. We prove that under a mild condition, our estimator of the degrees of freedom, although biased, is consistent. Numerical evidence shows that our estimator outperforms another biased risk estimator.