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arXiv 1503.08119q-fin.MF
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关于随机波动率模型下定价公式的分解

About the decomposition of pricing formulas under stochastic volatility models

Raul Merino, Josep Vives

摘要:

本文对一个非常一般的随机波动率扩散模型的看涨期权价格的分解进行了推广。[2]中的Heston模型。我们意识到,当股票价格不遵循指数模型时,就会出现一个新的术语。所使用的技术是非预期的。特别地,我们还看到,使用泛函伊藤微积分可以得到等价的结果。利用同样的推广思想,我们还将文[1]和[3]中得到的另一种看涨期权的价格分解公式推广到非指数模型,该公式是用波动率过程的Malliavin导数表示的。最后,我们给出了预期和非预期两种情况下隐含波动率导数的一般表达式。

英文摘要:

We obtain a decomposition of the call option price for a very general stochastic volatility diffusion model extending the decomposition obtained by E. Alòs in [2] for the Heston model. We realize that a new term arises when the stock price does not follow an exponential model. The techniques used are non anticipative. In particular, we see also that equivalent results can be obtained using Functional Itô Calculus. Using the same generalizing ideas we also extend to non exponential models the alternative call option price decompostion formula obtained in [1] and [3] written in terms of the Malliavin derivative of the volatility process. Finally, we give a general expression for the derivative of the implied volatility under both, the anticipative and the non anticipative case.

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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