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arXiv 2006.02667math.STstat.TH
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长记忆随机波动率时间序列尾部参数的变点检验

Change-point tests for the tail parameter of Long Memory Stochastic Volatility time series

Annika Betken, Davide Giraudo, Rafał Kulik

摘要:

我们考虑基于Hill估计的变点检验来检验长记忆随机波动率时间序列尾部指标的结构变化。为了确定相应检验统计量的渐近分布,我们证明了两参数Skorohod空间中尾部经验过程的一致约化原理。它表明,这样的过程显示了二分行为根据之间的相互作用的赫斯特参数,即,表征数据中的依赖性的参数和尾部索引。我们的理论结果是伴随着模拟研究和分析金融时间序列方面的结构变化的尾部指数。

英文摘要:

We consider a change-point test based on the Hill estimator to test for structural changes in the tail index of Long Memory Stochastic Volatility time series. In order to determine the asymptotic distribution of the corresponding test statistic, we prove a uniform reduction principle for the tail empirical process in a two-parameter Skorohod space. It is shown that such a process displays a dichotomous behavior according to an interplay between the Hurst parameter, i.e., a parameter characterizing the dependence in the data, and the tail index. Our theoretical results are accompanied by simulation studies and the analysis of financial time series with regard to structural changes in the tail index.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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