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:
arXiv: Statistics Theory
影响因子:
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通讯作者:
J. Fadili
J. Fadili
中科院分区:
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文献类型:
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作者:
Charles;G. Peyr'e;J. Fadili

文献摘要

被引文献

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在这项工作中,我们构建了一个硬阈值风险估计器,可以作为解决自动选择阈值这一难题的基础。由于硬阈值甚至不是连续的,因此斯坦因引理不能用于获得自由度的无偏估计,因此也不能获得风险的无偏估计。我们证明,在温和的条件下,我们的自由度估计虽然有偏差,但却是一致的。数值证据表明,我们的估计器优于另一个有偏差的风险估计器。
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.