Elliptical Regularized Hotelling Tests for High-Dimensional Change-Point Detection
高维变点检测的椭圆正则化Hotelling检验AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要核心是高维序列的位置变点检测与多变点定位,属结构变化方向;实证使用Fama–French 49个行业组合,涉及金融因子组合数据。
高维变点检测的椭圆正则化Hotelling检验AI 解读 ↓
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We propose an elliptical regularized Hotelling (ERHT) procedure for detecting location changes in high-dimensional sequences with heavy-tailed, cross-sectionally dependent observations. ERHT contrasts spatial medians on adjacent segments using a ridge-regularized inverse of the pooled centered spatial-sign covariance matrix, thereby combining robustness to radial variation with dependence-aware weighting. We establish Gaussian-process limits for the single- and multiple-change scans and joint convergence over a finite set of regularization parameters. These results provide asymptotically exact calibration of a Cauchy-aggregated adaptive test through the joint Gaussian limit, together with guarantees for local power and single-change localization. We further embed the ERHT score in wild binary segmentation and prove consistency for estimating the number and locations of multiple changes. Simulations show that ERHT is generally well calibrated and delivers competitive power under heavy-tailed distributions, particularly when cross-sectional dependence is substantial. An analysis of the Fama--French 49 industry portfolios reveals persistent evidence of location instability and identifies four structural breaks.
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