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arXiv 2302.02769q-fin.STphysics.soc-ph
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非高斯分布下金融收益率的建模与仿真

Modeling and Simulation of Financial Returns under Non-Gaussian Distributions

Federica De Domenico, Giacomo Livan, Guido Montagna, Oreste Nicrosini

AI总结:

针对金融收益率非高斯分布选型无共识的问题,本文对比研究主流高频收益率分布模型的统计特性,经蒙特卡洛仿真发现其在大幅价格变动标度特性上具有一致性,并探讨了收敛速率及对期权定价的影响。

摘要:

众所周知,高频金融收益率的概率分布呈现尖峰厚尾的特征。这一特性动摇了风险管理与期权定价标准方法背后所依据的对数收益率服从高斯分布的典型假设。然而,学界对于应采用哪一类概率分布来描述金融收益率尚未达成共识,文献中使用的不同模型均在不同程度上展现出复现实证观测到的典型事实的能力。为厘清这一问题,本文对高频金融数据分析实证中得到的最主流收益率分布模型开展了全面研究。我们对比了这些模型的统计特性,并基于符合实际的尾指数,通过蒙特卡洛采样对不同模型的非高斯金融波动动力学进行了仿真。研究结果表明,所考察的各类收益率分布在大幅价格变动的标度特性建模方面具有显著的一致性。我们还探讨了非高斯随机过程收敛到其渐近分布的速率,并以标准Black and Scholes方法为对照,研究了本研究结果对期权定价的影响,作为其潜在应用的首个示例。

英文摘要:

It is well known that the probability distribution of high-frequency financial returns is characterized by a leptokurtic, heavy-tailed shape. This behavior undermines the typical assumption of Gaussian log-returns behind the standard approach to risk management and option pricing. Yet, there is no consensus on what class of probability distributions should be adopted to describe financial returns and different models used in the literature have demonstrated, to varying extent, an ability to reproduce empirically observed stylized facts. In order to provide some clarity, in this paper we perform a thorough study of the most popular models of return distributions as obtained in the empirical analyses of high-frequency financial data. We compare the statistical properties and simulate the dynamics of non-Gaussian financial fluctuations by means of Monte Carlo sampling from the different models in terms of realistic tail exponents. Our findings show a noticeable consistency between the considered return distributions in the modeling of the scaling properties of large price changes. We also discuss the convergence rate to the asymptotic distributions of the non-Gaussian stochastic processes and we study, as a first example of possible applications, the impact of our results on option pricing in comparison with the standard Black and Scholes approach.

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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