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The purpose of this paper is to explore whether stock index volatility series exhibit real long memory.Design/methodology/approachThe authors employ sequential procedure to test structural break in volatility series, and use DFA and 2ELW to estimate long memory parameter for the whole samples and subsamples, and further apply adaptive FIGARCH (AFIGARCH) to describe long memory and structural break.FindingsThe empirical results show that stock index volatility series are characterized by long memory and structural break, and therefore it is appropriate to use AFIGARCH to model stock index volatility process.Originality/valueThis study empirically investigates the properties of long memory and structural break in stock index volatility series. The conclusion has a certain reference value for understanding the properties of long memory and structural break in volatility series for academic researchers, market participants and policy makers, and for modeling and forecasting future volatility, testing market efficiency, pricing financial assets, constructing quantitative investment strategy and measuring market risk.
China Finance Review International – Emerald Publishing
Published: Aug 16, 2019
Keywords: Stock market; Volatility; Long memory; Structural break; AFIGARCH
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