Sparse confidence sets for normal mean models
Sparse confidence sets for normal mean models
复制标题
正态平均模型的稀疏置信集
DOI:
10.1093/imaiai/iaad003
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发表时间:
2023
期刊:
影响因子:
--
通讯作者:
Cheng, Guang
中科院分区:
文献类型:
--
作者:
Ning, Yang;Cheng, Guang
In this paper, we propose a new framework to construct confidence sets for a-dimensional unknown sparse parameterunder the normal mean model. A key feature of the proposed confidence set is its capability to account for the sparsity of, thus named assparseconfidence set. This is in sharp contrast with the classical methods, such as the Bonferroni confidence intervals and other resampling-based procedures, where the sparsity ofis often ignored. Specifically, we require the desired sparse confidence set to satisfy the following two conditions: (i) uniformly over the parameter space, the coverage probability foris above a pre-specified level; (ii) there exists a random subsetofsuch thatguarantees the pre-specified true negative rate for detecting non-zero’s. To exploit the sparsity of, we allow the confidence interval forto degenerate to a single point 0 for any. Under this new framework, we first consider whether there exist sparse confidence sets that satisfy the above two conditions. To address this question, we establish a non-asymptotic minimax lower bound for the non-coverage probability over a suitable class of sparse confidence sets. The lower bound deciphers the role of sparsity and minimum signal-to-noise ratio (SNR) in the construction of sparse confidence sets. Furthermore, under suitable conditions on the SNR, a two-stage procedure is proposed to construct a sparse confidence set. To evaluate the optimality, the proposed sparse confidence set is shown to attain a minimax lower bound of some properly defined risk function up to a constant factor. Finally, we develop an adaptive procedure to the unknown sparsity. Numerical studies are conducted to verify the theoretical results.
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DOI:
--
发表时间:
2013
期刊:
影响因子:
--
作者:
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通讯作者:
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影响因子:
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影响因子:
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通讯作者:
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影响因子:
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作者:
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