arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1503.07302math.STstat.TH
收藏

高维低样本量下协方差阵的第一主成分和相等性检验的渐近性质

Asymptotic properties of the first principal component and equality tests of covariance matrices in high-dimension, low-sample-size context

Aki Ishii, Kazuyoshi Yata, Makoto Aoshima

摘要:

高维数据的一个共同特点是数据维数高,但样本量相对较低。我们称这种数据为HDLSS数据。本文研究了HDLSS下第一主成分的渐近性质,并将其应用于高维数据集协方差阵的相等性检验。当样本量固定和样本量趋于无穷大时,我们考虑HDLSS渐近理论的维数增长。我们引入了一个特征值估计的降噪方法,并提供渐近分布的HDLSS上下文中的最大特征值。我们构造了第一贡献率的置信区间。我们给出了第一PC方向和PC分数的渐近性质。我们将研究结果应用于HDLSS上下文中两个协方差阵的相等性检验。我们给出了数值结果,并讨论了第一个PC的估计和两个协方差阵的相等性检验的性能。

英文摘要:

A common feature of high-dimensional data is that the data dimension is high, however, the sample size is relatively low. We call such data HDLSS data. In this paper, we study asymptotic properties of the first principal component in the HDLSS context and apply them to equality tests of covariance matrices for high dimensional data sets. We consider HDLSS asymptotic theories as the dimension grows for both the cases when the sample size is fixed and the sample size goes to infinity. We introduce an eigenvalue estimator by the noise-reduction methodology and provide asymptotic distributions of the largest eigenvalue in the HDLSS context. We construct a confidence interval of the first contribution ratio. We give asymptotic properties both for the first PC direction and PC score as well. We apply the findings to equality tests of two covariance matrices in the HDLSS context. We provide numerical results and discussions about the performances both on the estimates of the first PC and the equality tests of two covariance matrices.

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。

↑