《From the Samuelson Volatility Effect to a Samuelson Correlation Effect:
Evidence from Crude Oil Calendar Spread Options》
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作者:
Lorenz Schneider and Bertrand Tavin
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最新提交年份:
2015
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英文摘要:
We introduce a multi-factor stochastic volatility model based on the CIR/Heston stochastic volatility process. In order to capture the Samuelson effect displayed by commodity futures contracts, we add expiry-dependent exponential damping factors to their volatility coefficients. The pricing of single underlying European options on futures contracts is straightforward and can incorporate the volatility smile or skew observed in the market. We calculate the joint characteristic function of two futures contracts in the model in analytic form and use the one-dimensional Fourier inversion method of Caldana and Fusai (JBF 2013) to price calendar spread options. The model leads to stochastic correlation between the returns of two futures contracts. We illustrate the distribution of this correlation in an example. We then propose analytical expressions to obtain the copula and copula density directly from the joint characteristic function of a pair of futures. These expressions are convenient to analyze the term-structure of dependence between the two futures produced by the model. In an empirical application we calibrate the proposed model to volatility surfaces of vanilla options on WTI. In this application we provide evidence that the model is able to produce the desired stylized facts in terms of volatility and dependence. In a separate appendix, we give guidance for the implementation of the proposed model and the Fourier inversion results by means of one and two-dimensional FFT methods.
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中文摘要:
我们介绍了一个基于CIR/Heston随机波动过程的多因素随机波动模型。为了捕捉商品期货合约表现出的萨缪尔森效应,我们在其波动系数中加入了到期相关的指数阻尼因子。期货合约上单一标的欧洲期权的定价很简单,可以结合市场中观察到的波动性微笑或扭曲。我们以解析形式计算模型中两个期货合约的联合特征函数,并使用Caldana和Fusai(JBF 2013)的一维傅里叶反演方法对日历价差期权进行定价。该模型导致两个期货合约的收益之间存在随机相关性。我们用一个例子来说明这种相关性的分布。然后,我们提出了直接从一对期货的联合特征函数中获得copula和copula密度的解析表达式。这些表达式便于分析由该模型产生的两个期货之间依赖的期限结构。在一个实证应用中,我们将所提出的模型校准到WTI上的普通期权的波动面上。在这个应用中,我们提供了证据,证明该模型能够在波动性和依赖性方面产生所需的程式化事实。在另一个附录中,我们给出了通过一维和二维FFT方法实现所提出模型和傅里叶反演结果的指南。
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分类信息:
一级分类:Quantitative Finance 数量金融学
二级分类:Pricing of Securities 证券定价
分类描述:Valuation and hedging of financial securities, their derivatives, and structured products
金融证券及其衍生产品和结构化产品的估值和套期保值
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From_the_Samuelson_Volatility_Effect_to_a_Samuelson_Correlation_Effect:_Evidence.pdf
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