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arXiv 1802.09117math.STstat.MEstat.MLstat.TH
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高维非稀疏结构线性模型的可测性

Testability of high-dimensional linear models with non-sparse structures

Jelena Bradic, Jianqing Fan, Yinchu Zhu

摘要:

近年来,在可能非稀疏的高维模型下理解统计推断得到了广泛的关注。对于一个给定的回归系数的组成部分,我们表明,问题的难度取决于相应行的协变量的精度矩阵的稀疏性,而不是回归系数的稀疏性。我们开发了统一的和基本上统一的不可测试性的新概念,允许在广泛的替代品的测试的局限性的研究。一致不可测性确定了一个备选方案的集合,使得任何检验对该组中任何备选方案的功效渐近至多等于标称大小。新的建设的影响,包括新的极大极小可测性的结果,在目前的结果形成鲜明对比,不依赖于稀疏的回归参数。我们确定了新的可测试性和功能相关性之间的权衡。特别是,我们表明,在弱特征相关性的模型中,极大极小下界可以通过测试,其功率具有$\sqrt{n}$率,而不管模型稀疏性的大小。

英文摘要:

Understanding statistical inference under possibly non-sparse high-dimensional models has gained much interest recently. For a given component of the regression coefficient, we show that the difficulty of the problem depends on the sparsity of the corresponding row of the precision matrix of the covariates, not the sparsity of the regression coefficients. We develop new concepts of uniform and essentially uniform non-testability that allow the study of limitations of tests across a broad set of alternatives. Uniform non-testability identifies a collection of alternatives such that the power of any test, against any alternative in the group, is asymptotically at most equal to the nominal size. Implications of the new constructions include new minimax testability results that, in sharp contrast to the current results, do not depend on the sparsity of the regression parameters. We identify new tradeoffs between testability and feature correlation. In particular, we show that, in models with weak feature correlations, minimax lower bound can be attained by a test whose power has the $\sqrt{n}$ rate, regardless of the size of the model sparsity.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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