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QUANTILE DOUBLE AUTOREGRESSION

Published online by Cambridge University Press:  25 June 2021

Qianqian Zhu*
Affiliation:
Shanghai University of Finance and Economics
Guodong Li
Affiliation:
University of Hong Kong
*
Address correspondence to Qianqian Zhu, School of Statistics and Management, Shanghai University of Finance and Economics, Shanghai, China; e-mail: zhu.qianqian@mail.shufe.edu.cn.
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Abstract

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Many financial time series have varying structures at different quantile levels, and also exhibit the phenomenon of conditional heteroskedasticity at the same time. However, there is presently no time series model that accommodates both of these features. This paper fills the gap by proposing a novel conditional heteroskedastic model called “quantile double autoregression”. The strict stationarity of the new model is derived, and self-weighted conditional quantile estimation is suggested. Two promising properties of the original double autoregressive model are shown to be preserved. Based on the quantile autocorrelation function and self-weighting concept, three portmanteau tests are constructed to check the adequacy of the fitted conditional quantiles. The finite sample performance of the proposed inferential tools is examined by simulation studies, and the need for use of the new model is further demonstrated by analyzing the S&P500 Index.

Information

Type
ARTICLES
Copyright
© The Author(s), 2021. Published by Cambridge University Press
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Zhu and Li supplementary material

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