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arXiv 1702.04443q-fin.ST
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具有时变背景利率的Hawkes过程模型及其在高频金融数据中的应用

Hawkes process model with a time-dependent background rate and its application to high-frequency financial data

Takahiro Omi, Yoshito Hirata, Kazuyuki Aihara

摘要:

建立了一个具有时变背景利率的Hawkes过程模型,用于分析高频金融数据。在我们的模型中,背景速率的对数由具有相对大量的可变宽度基函数的线性模型建模,并且参数由贝叶斯方法估计。我们的模型不仅可以捕捉到缓慢的时间变化,如在一天的季节性,但也快速的,这之后的宏观经济新闻公告。通过对日经225迷你指数的报价数据进行分析,我们发现:(1)与量化金融领域常用的背景利率为常数和背景利率为缓变的Hawkes模型相比,本文的模型对数据的拟合效果更好;(ii)改善─我们的模型对数据的拟合是显著的,特别是对于背景速率存在相当大的波动的会话;以及(iii)我们的模型在统计上与数据一致。我们的模型估计的分支比是0.41,它量化了市场的内生性水平,这表明了市场动态中外生因素的相对重要性。我们还表明,它是至关重要的,以适当的模型依赖于时间的背景速率的分支比估计。

英文摘要:

A Hawkes process model with a time-varying background rate is developed for analyzing the high-frequency financial data. In our model, the logarithm of the background rate is modeled by a linear model with a relatively large number of variable-width basis functions, and the parameters are estimated by a Bayesian method. Our model can capture not only the slow time-variation, such as in the intraday seasonality, but also the rapid one, which follows a macroeconomic news announcement. By analyzing the tick data of the Nikkei 225 mini, we find that (i) our model is better fitted to the data than the Hawkes models with a constant background rate or a slowly varying background rate, which have been commonly used in the field of quantitative finance; (ii) the improvement in the goodness-of-fit to the data by our model is significant especially for sessions where considerable fluctuation of the background rate is present; and (iii) our model is statistically consistent with the data. The branching ratio, which quantifies the level of the endogeneity of markets, estimated by our model is 0.41, suggesting the relative importance of exogenous factors in the market dynamics. We also demonstrate that it is critically important to appropriately model the time-dependent background rate for the branching ratio estimation.

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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