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Time series analysis of persistence in crude oil price volatility across bull and bear regimes

机译:牛市和熊市制度中原油价格波动持续存在的时间序列分析

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This paper deals with the analysis of crude oil prices in the context of fractional integration and using bull and bear phases over monthly periods between September, 1859 to July, 2015. We examine both the log prices series as well as volatility, approximated by means of the absolute and the squared returns. The results for the whole sample indicate that the log-prices are nonstationary, with an order of integration close to 1 or even higher than 1, while the squared and absolute returns show evidence of long memory behavior. Upon separating the sample according to bull and bear periods, we observe an increase in the order of integration in both the log-prices and the two measures of volatility. Our results have important policy implications. (C) 2016 Elsevier Ltd. All rights reserved.
机译:本文涉及在分数整合的背景下对原油价格进行的分析,并使用了1859年9月至2015年7月期间每月的牛市和熊市阶段。绝对收益和平方收益。整个样本的结果表明,对数价格是不稳定的,积分阶次接近1或什至大于1,而平方和绝对收益则表明存在长期记忆行为。在根据牛市和熊市时期对样本进行分离时,我们发现对数价格和两种波动率度量的积分顺序都有所增加。我们的结果具有重要的政策含义。 (C)2016 Elsevier Ltd.保留所有权利。

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