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• W3034606471 abstract "Summary In recent years, change point detection for a high dimensional data sequence has become increasingly important in many scientific fields such as biology and finance. The existing literature develops a variety of methods designed for either a specified parameter (e.g. the mean or covariance) or a particular alternative pattern (sparse or dense), but not for both scenarios simultaneously. To overcome this limitation, we provide a general framework for developing tests that are suitable for a large class of parameters, and also adaptive to various alternative scenarios. In particular, by generalizing the classical cumulative sum statistic, we construct the U-statistic-based cumulative sum matrix C. Two cases corresponding to common or different change point locations across the components are considered. We then propose two types of individual test statistics by aggregating C on the basis of the adjusted Lp-norm with p ∈ {1, …, ∞}. Combining the corresponding individual tests, we construct two types of data-adaptive tests for the two cases, which are both powerful under various alternative patterns. A multiplier bootstrap method is introduced for approximating the proposed test statistics’ limiting distributions. With flexible dependence structure across co-ordinates and mild moment conditions, we show the optimality of our methods theoretically in terms of size and power by allowing the dimension d and the number of parameters q to be much larger than the sample size n. An R package called AdaptiveCpt is developed to implement our algorithms. Extensive simulation studies provide further support for our theory. An application to a comparative genomic hybridization data set also demonstrates the usefulness of our proposed methods." @default.
• W3034606471 created "2020-06-19" @default.
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• W3034606471 date "2020-06-12" @default.
• W3034606471 modified "2023-10-04" @default.
• W3034606471 title "A Unified Data-Adaptive Framework for High Dimensional Change Point Detection" @default.
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• W3034606471 doi "https://doi.org/10.1111/rssb.12375" @default.
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