Robust estimation of high-dimensional covariance and precision matrices.
Robust estimation of high-dimensional covariance and precision matrices.
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DOI:
10.1093/biomet/asy011
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发表时间:
2018-06-01
期刊:
影响因子:
2.7
通讯作者:
Li Q
中科院分区:
文献类型:
--
作者:
Avella-Medina M;Battey HS;Fan J;Li Q
High-dimensional data are often most plausibly generated from distributions with complex structure and leptokurtosis in some or all components. Covariance and precision matrices provide a useful summary of such structure, yet the performance of popular matrix estimators typically hinges upon a sub-Gaussianity assumption. This paper presents robust matrix estimators whose performance is guaranteed for a much richer class of distributions. The proposed estimators, under a bounded fourth moment assumption, achieve the same minimax convergence rates as do existing methods under a sub-Gaussianity assumption. Consistency of the proposed estimators is also established under the weak assumption of bounded 2 + ε moments for ε ∈ (0, 2). The associated convergence rates depend on ε.
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发表时间:
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期刊:
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