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arXiv 1909.04986q-fin.STphysics.data-an
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具有相关等待时间的连续时间随机游走。交易间时间在波动率聚集中的关键作用

Continuous Time Random Walk with correlated waiting times. The crucial role of inter-trade times in volatility clustering

Jarosław Klamut, Tomasz Gubiec

摘要:

在许多物理、社会或经济现象中,我们只在离散的、不规则分布的时间点上观察到所研究的量的变化。物理学家用来描述这类变量的随机过程是连续时间随机游走(CTRW)。尽管这种类型的随机过程和强大的经验动机的流行,模型与观测之间的时间间隔序列内的长期记忆是缺失的。在这里,我们通过引入一个新的CTRW家族来填补这一空白。通过假设许多连续的时间间隔可以是相同的,将记忆引入模型。令人惊讶的是,在这个过程中,我们可以观察到一个缓慢衰减的非线性自相关函数,而没有时间间隔的厚尾分布。我们的模型应用于高频股票市场数据可以成功地描述非线性自相关函数的衰减斜率的股票市场收益。该模型实现了这一结果,连续的价格变化之间没有依赖性。这证明了事件间隔时间在所有股票市场中观察到的波动率聚集现象中的关键作用。

英文摘要:

In many physical, social or economical phenomena we observe changes of a studied quantity only in discrete, irregularly distributed points in time. The stochastic process used by physicists to describe this kind of variables is the Continuous Time Random Walk (CTRW). Despite the popularity of this type of stochastic processes and strong empirical motivation, models with a long-term memory within the sequence of time intervals between observations are missing. Here, we fill this gap by introducing a new family of CTRWs. The memory is introduced to the model by the assumption that many consecutive time intervals can be the same. Surprisingly, in this process we can observe a slowly decaying nonlinear autocorrelation function without a fat-tailed distribution of time intervals. Our model applied to high-frequency stock market data can successfully describe the slope of decay of nonlinear autocorrelation function of stock market returns. The model achieves this result with no dependence between consecutive price changes. It proves the crucial role of inter-event times in the volatility clustering phenomenon observed in all stock markets.

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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