arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0704.3798q-fin.STphysics.data-anphysics.soc-ph
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资产价格互相关的埃普斯效应模型

Modeling the Epps effect of cross correlations in asset prices

Bence Toth, Balint Toth, Janos Kertesz

摘要:

我们回顾了股票收益率互相关的分解方法,以前提出的相关系数对数据的分辨率(Epps效应)的依赖关系。通过随机行走/布朗运动和无记忆的更新过程(即泊松点过程)的玩具模型的观察时间,我们表明,在分析可处理的情况下,通过分解的相关性,我们得到的频率依赖性的确切结果。我们还表明,我们的方法产生合理的拟合的依赖关系的数据分辨率的情况下,经验数据。我们的研究结果表明,Epps现象是高分辨率数据的滞后相关性的有限时间衰减的产物,它不与活动成比例。特征时间是由于人类的时间尺度,对新闻做出反应所需的时间。

英文摘要:

We review the decomposition method of stock return cross-correlations, presented previously for studying the dependence of the correlation coefficient on the resolution of data (Epps effect). Through a toy model of random walk/Brownian motion and memoryless renewal process (i.e. Poisson point process) of observation times we show that in case of analytical treatability, by decomposing the correlations we get the exact result for the frequency dependence. We also demonstrate that our approach produces reasonable fitting of the dependence of correlations on the data resolution in case of empirical data. Our results indicate that the Epps phenomenon is a product of the finite time decay of lagged correlations of high resolution data, which does not scale with activity. The characteristic time is due to a human time scale, the time needed to react to news.

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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