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arXiv 2203.08786stat.ME
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高维均值的有限样本t检验

Finite Sample t-Tests for High-Dimensional Means

Jun Li

摘要:

如果对样本量非常小的数据实施要求不同样本量的渐近检验程序,则可能发生样本量失真。本文研究了高维数据但样本量很小时均值向量的单样本和双样本检验问题。本文建立了单样本和双样本U-统计量的渐近t-分布,它只要求数据维数发散,但样本量是固定的且不小于3。模拟研究证实了理论结果,即所提出的测试保持准确的经验大小为广泛的样本量和数据维数。我们将所提出的测试应用到fMRI数据集,以证明该方法的实际实施。

英文摘要:

Size distortion can occur if an asymptotic testing procedure requiring diverging sample sizes, is implemented to data with very small sample sizes. In this paper, we consider one-sample and two-sample tests for mean vectors when data are high-dimensional but sample sizes are very small. We establish asymptotic t-distributions of one-sample and two-sample U-statistics, which only require data dimensionality to diverge but sample sizes to be fixed and no less than 3. Simulation studies confirm the theoretical results that the proposed tests maintain accurate empirical sizes for a wide range of sample sizes and data dimensionalities. We apply the proposed tests to an fMRI dataset to demonstrate the practical implementation of the methods.

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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