Abstract
This study considers interval-valued time series data. To characterize such data, we propose an auto-interval-regressive (AIR) model using the order statistics from normal distributions. Furthermore, to better capture the heteroscedasticity in volatility, we design a heteroscedastic volatility AIR (HVAIR) model. We derive the likelihood functions of the AIR and HVAIR models to obtain the maximum likelihood estimator. Monte Carlo simulations are then conducted to evaluate our methods of estimation and confirm their validity. A real data example from the S&P 500 Index is used to demonstrate our method.
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Acknowledgements
We would like to thank the editor, AE, and two anonymous referees for their valuable comments.
Funding
Funding was provided by Ministry of Science and Technology, Taiwan (Grant No. MOST 108-2118-M-006-010-MY2) and National Research Foundation of Korea (Grant No. No. 2018R1A2A2A05019433).
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Lin, LC., Chien, HL. & Lee, S. Symbolic interval-valued data analysis for time series based on auto-interval-regressive models. Stat Methods Appl 30, 295–315 (2021). https://doi.org/10.1007/s10260-020-00525-7
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DOI: https://doi.org/10.1007/s10260-020-00525-7