Optimal detection of general moment changes: Simultaneous mean and covariance change detection and beyond
一般矩变点的最优检测:均值与协方差变点同时检测及推广AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要研究多元时间序列的分段常数分布变化与多变点检测,直接对应时间序列与结构变化两个方向。
一般矩变点的最优检测:均值与协方差变点同时检测及推广AI 解读 ↓
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We study multiple change-point detection in multivariate time series whose distributions change in a piecewise constant manner. Distributional changes can manifest across different moment orders, from shifts in the mean and covariance to changes in higher-order moments. Higher-order moments capture increasingly rich distributional features but become difficult to estimate in high dimensions. Our tensor representation unifies moments of different orders within a common linear algebraic framework, enabling a new method to detect changes in moments of all orders up to a prescribed fixed order $p$. The resulting procedure accommodates temporal dependence and allows the dimension of the time series to grow with the sample size. Under suitable regularity conditions, the proposed procedure achieves a localization error rate that matches a newly developed minimax lower bound. We further derive limiting distributions under both nonvanishing and vanishing moment jumps and construct asymptotically valid confidence intervals in the vanishing-jump regime. Numerical experiments and real-data analyses demonstrate the method's effectiveness in detecting moment changes and a range of distributional shifts.