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arXiv 1907.09522stat.ME
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高维变点时间序列的因子分析

Factor Analysis for High-Dimensional Time Series with Change Point

Xialu Liu, Ting Zhang

摘要:

我们考虑高维时间序列的变点潜在因子模型,其中潜在因子结构中可能存在结构性突变。特别地,我们提出了变点前后因子载荷空间的相合估计量,并考虑了变点位置的估计问题。与已有的高维时间序列变点因子分析结果相比,本文的一个显著特点是,我们的结果允许强的横截面依赖噪声过程。为了适应未知程度的横截面依赖强度,我们提出了使用自归一化来量化的变点检验统计量。数值实验,包括蒙特卡罗模拟研究和实际数据的应用,以说明所提出的方法。

英文摘要:

We consider change-point latent factor models for high-dimensional time series, where a structural break may exist in the underlying factor structure. In particular, we propose consistent estimators for factor loading spaces before and after the change point, and the problem of estimating the change-point location is also considered. Compared with existing results on change-point factor analysis of high-dimensional time series, a distinguished feature of the current paper is that our results allow strong cross-sectional dependence in the noise process. To accommodate the unknown degree of cross-sectional dependence strength, we propose to use self-normalization to pivotalize the change-point test statistic. Numerical experiments including a Monte Carlo simulation study and a real data application are presented to illustrate the proposed methods.

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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