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股票市场历史信息的长记忆性特征研究

, PP. 37-45

Keywords: 反持久性,长记忆性,LW估计,极端事件

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Abstract:

?回顾历史是为了预测未来,历史能够蕴含事物发展的脉络和内在规律。那么投资者能否通过对股市历史的分析来制定投资决策以及预测未来走势?文章选择中国沪深两市指数、亚洲有代表性的日经225指数以及在世界金融市场有重要影响的标准普尔500指数为研究对象,运用动态估计方法,对股市长记忆性的时变特征进行分析,探讨股票市场历史信息的可鉴性;除采用修正R/S方法、LW估计外,又加入较为新颖的ELW和FLW两种方法作为对比。实证结果表明,虽然几种方法得出的时变长记忆参数并非完全相同,但是有关股市长记忆性的结论基本一致;股市收益序列在整个样本区间并未表现出显著的长记忆性,但在极端事件发生时,收益序列会表现出显著的相关性,体现了股市长记忆性的时变特征,此时可以通过对历史数据信息的分析,达到规避极端风险的目的。

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