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arXiv 2107.09418math.STstat.TH
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高维多元正态分布的方向检验

Directional testing for high-dimensional multivariate normal distributions

Caizhu Huang, Claudia Di Caterina, Nicola Sartori

摘要:

由于其良好的性质,多元正态分布仍然被广泛用于各种科学领域的现象建模。然而,当分量数$p$与样本量$n$具有相同的渐近阶时,标准推理技术通常不足以对均值向量和/或协方差阵进行假设检验。在几个突出的框架内,我们建议通过方向性测试得出可靠的结论。我们表明,在原假设的方向$p$值是完全均匀分布的,即使当$p$是相同的顺序的$n$,提供了正常模型的最大似然估计的存在条件得到满足。大量的仿真结果证实了理论研究结果在不同的值的$p/n$,并表明,在原假设的方向测试优于不仅是通常的第一和高阶有限$p$的解决方案,但也可供选择的方法为高维设置。仿真结果还表明,不同的测试的功率性能取决于特定的备择假设。

英文摘要:

Thanks to its favorable properties, the multivariate normal distribution is still largely employed for modeling phenomena in various scientific fields. However, when the number of components $p$ is of the same asymptotic order as the sample size $n$, standard inferential techniques are generally inadequate to conduct hypothesis testing on the mean vector and/or the covariance matrix. Within several prominent frameworks, we propose then to draw reliable conclusions via a directional test. We show that under the null hypothesis the directional $p$-value is exactly uniformly distributed even when $p$ is of the same order of $n$, provided that conditions for the existence of the maximum likelihood estimate for the normal model are satisfied. Extensive simulation results confirm the theoretical findings across different values of $p/n$, and show that under the null hypothesis the directional test outperforms not only the usual first and higher-order finite-$p$ solutions but also alternative methods tailored for high-dimensional settings. Simulation results also indicate that the power performance of the different tests depends on the specific alternative hypothesis.

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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