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arXiv 0709.0810q-fin.STphysics.soc-ph
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随机波动率模型的比较研究

A Comparative Study of Stochastic Volatility Models

E. Cisana, L. Fermi, G. Montagna, O. Nicrosini

摘要:

相关随机波动率模型是Black和Scholes-Merton框架的自然扩展:这里的波动率不是常数,而是一个与价格对数收益率相关的随机过程。目前,文献中讨论了几种随机波动率模型,不同的是波动率的动态特性。本工作的目的是比较三个流行的模型:Vasicek,赫斯顿和指数Ornstein-Uhlenbeck模型的最新结果。我们分析了他们中的每一个在文献中已知的理论结果(波动率和收益率分布,高阶矩和不同时间的相关性),以测试其对原始数值模拟结果的预测有效性,特别注意他们再现价格的经验统计特性的能力。数值结果表明,这些模型可以实现保持其所有功能,特别是在金融应用,如市场风险管理或期权定价。为了批判性地比较模型,我们还进行了实证分析,从意大利股票市场的金融时间序列,显示指数Ornstein-Uhlenbeck模型的能力,捕捉程式化的事实波动和对数回报概率分布。

英文摘要:

The correlated stochastic volatility models constitute a natural extension of the Black and Scholes-Merton framework: here the volatility is not a constant, but a stochastic process correlated with the price log-return one. At present, several stochastic volatility models are discussed in the literature, differing in the dynamics attached to the volatility. The aim of the present work is to compare the most recent results about three popular models: the Vasicek, Heston and exponential Ornstein-Uhlenbeck models. We analyzed for each of them the theoretical results known in the literature (volatility and return distribution, higher-order moments and different-time correlations) in order to test their predictive effectiveness on the outcomes of original numerical simulations, paying particular attention to their ability to reproduce empirical statistical properties of prices. The numerical results demonstrate that these models can be implemented maintaining all their features, especially in view of financial applications like market risk management or option pricing. In order to critically compare the models, we also perform an empirical analysis of financial time series from the Italian stock market, showing the exponential Ornstein-Uhlenbeck model's ability to capture the stylized facts of volatility and log-return probability distributions.

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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