arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1610.04580math.STstat.MEstat.MLstat.TH
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非稀疏高维线性模型的双样本检验

Two-sample testing in non-sparse high-dimensional linear models

Yinchu Zhu, Jelena Bradic

摘要:

在分析高维模型时,模型参数的稀疏性是一个常见但通常不可取的假设。本文研究了如下两个样本检验问题:给定两个由两个高维线性模型生成的样本,检验这两个线性模型的回归系数是否相同.我们提出了一个名为TIERS(TestIng Equality of Regression Slopes的缩写)的框架,它解决了两个样本的测试问题,而不对回归参数的稀疏性做任何假设。TIERS通过将两个样本进行卷积来构建新的模型,使得原始假设转化为新的矩条件。一个自规范化的结构,然后开发形成一个时刻测试。我们为开发的框架提供了严格的理论。在非常弱的条件下的特征协方差,我们表明,所提出的测试在控制I型错误的准确性是强大的缺乏稀疏的功能和重尾的误差分布,即使当样本量是小于的特征尺寸。此外,我们讨论了极大极小最优性和效率的性质所提出的测试。仿真分析表明,我们的测试具有良好的有限样本性能。在推导测试时,我们还开发了独立感兴趣的工具。该测试是建立在一种新的估计,称为自动自适应Dantzig的(ADDS),它不仅自动选择一个适当的规模的误差项,但也结合了先验信息。为了有效地近似检验统计量的临界值,我们开发了一种新的高维插件的方法,补充了高斯逼近论的最新进展。

英文摘要:

In analyzing high-dimensional models, sparsity of the model parameter is a common but often undesirable assumption. In this paper, we study the following two-sample testing problem: given two samples generated by two high-dimensional linear models, we aim to test whether the regression coefficients of the two linear models are identical. We propose a framework named TIERS (short for TestIng Equality of Regression Slopes), which solves the two-sample testing problem without making any assumptions on the sparsity of the regression parameters. TIERS builds a new model by convolving the two samples in such a way that the original hypothesis translates into a new moment condition. A self-normalization construction is then developed to form a moment test. We provide rigorous theory for the developed framework. Under very weak conditions of the feature covariance, we show that the accuracy of the proposed test in controlling Type I errors is robust both to the lack of sparsity in the features and to the heavy tails in the error distribution, even when the sample size is much smaller than the feature dimension. Moreover, we discuss minimax optimality and efficiency properties of the proposed test. Simulation analysis demonstrates excellent finite-sample performance of our test. In deriving the test, we also develop tools that are of independent interest. The test is built upon a novel estimator, called Auto-aDaptive Dantzig Selector (ADDS), which not only automatically chooses an appropriate scale of the error term but also incorporates prior information. To effectively approximate the critical value of the test statistic, we develop a novel high-dimensional plug-in approach that complements the recent advances in Gaussian approximation theory.

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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