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• W2622144316 abstract "Models for financial risk often assume that underlying asset returns are stationary. However, there is strong evidence that multivariate financial time series entail changes not only in their within-series dependence structure, but also in the cross-sectional dependence among them. In particular, the stressed Value-at-Risk of a portfolio, a popularly adopted measure of market risk, cannot be gauged adequately unless such structural breaks are taken into account in its estimation. We propose a method for consistent detection of multiple change points in high-dimensional GARCH panel data set where both individual GARCH processes and their correlations are allowed to change over time. We prove its consistency in multiple change point estimation, and demonstrate its good performance through simulation studies and an application to the Value-at-Risk problem on a real dataset. Our methodology is implemented in the R package segMGarch, available from CRAN." @default.
• W2622144316 created "2017-06-15" @default.
• W2622144316 creator A5019112980 @default.
• W2622144316 creator A5063483022 @default.
• W2622144316 date "2017-06-04" @default.
• W2622144316 modified "2023-09-25" @default.
• W2622144316 title "High-dimensional GARCH process segmentation with an application to Value-at-Risk" @default.
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• W2622144316 doi "https://doi.org/10.48550/arxiv.1706.01155" @default.
• W2622144316 hasPublicationYear "2017" @default.
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