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arXiv 2006.00636math.STstat.TH
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高维时间序列中的序列变点检测

Sequential change point detection in high dimensional time series

Josua Gösmann, Christina Stoehr, Johannes Heiny, Holger Dette

摘要:

近年来,高维数据中的变点检测受到了广泛的关注。大多数文献要么设计了回顾性分析的方法,当统计推断开始时,整个样本已经可用,要么考虑在线检测方案控制平均时间,直到误报。本文采取了不同的观点,并制定了监测计划的在线场景,高维数据先后到达,目标是尽可能快地检测变化,同时控制的概率的I型错误的虚警。我们开发了一个连续的过程,能够检测连续观察到的高维时间序列的空间和时间依赖性的均值向量的变化。在样本大小和维数都趋于无穷大的情况下,分析了该方法的统计性质。在这种情况下,它示出了新的监测方案下的原假设的无变化的渐近水平α,并在至少一个组件的高维均值向量的变化的替代下是一致的。该方法是基于一种新型的监测计划的一维数据,这往往是更强大的比通常使用的CRAMUM和Page-CRAMUM方法,和组件明智的统计汇总的最大统计。对于我们的监测方案的渐近性质的分析,我们证明了布朗运动的范围在一个给定的时间间隔是在吸引区域的Gumbel分布,这是一个结果的独立利益的极值理论。通过模拟研究和数据示例分析说明了新方法的有限样本性质。

英文摘要:

Change point detection in high dimensional data has found considerable interest in recent years. Most of the literature either designs methodology for a retrospective analysis, where the whole sample is already available when the statistical inference begins, or considers online detection schemes controlling the average time until a false alarm. This paper takes a different point of view and develops monitoring schemes for the online scenario, where high dimensional data arrives successively and the goal is to detect changes as fast as possible controlling at the same time the probability of a type I error of a false alarm. We develop a sequential procedure capable of detecting changes in the mean vector of a successively observed high dimensional time series with spatial and temporal dependence. The statistical properties of the method are analyzed in the case where both, thesample size and dimension tend to infinity. In this scenario, it is shown that the new monitoring scheme has asymptotic level alpha under the null hypothesis of no change and is consistent under the alternative of a change in at least one component of the high dimensional mean vector. The approach is based on a new type of monitoring scheme for one-dimensional data which turns out to be often more powerful than the usually used CUSUM and Page-CUSUM methods, and the component-wise statistics are aggregated by the maximum statistic. For the analysis of the asymptotic properties of our monitoring scheme we prove that the range of a Brownian motion on a given interval is in the domain of attraction of the Gumbel distribution, which is a result of independent interest in extreme value theory. The finite sample properties of the new methodology are illustrated by means of a simulation study and in the analysis of a data example.

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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