Break detection in the covariance structure of multivariate time series models
多元时间序列模型协方差结构的突变检测AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要明确研究多元时间序列协方差稳定性、突变检测及 GARCH 波动模型,并包含金融数据应用。
多元时间序列模型协方差结构的突变检测AI 解读 ↓
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In this paper, we introduce an asymptotic test procedure to assess the stability of volatilities and cross-volatilites of linear and nonlinear multivariate time series models. The test is very flexible as it can be applied, for example, to many of the multivariate GARCH models established in the literature, and also works well in the case of high dimensionality of the underlying data. Since it is nonparametric, the procedure avoids the difficulties associated with parametric model selection, model fitting and parameter estimation. We provide the theoretical foundation for the test and demonstrate its applicability via a simulation study and an analysis of financial data. Extensions to multiple changes and the case of infinite fourth moments are also discussed.