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Perturbation Expansion for Option Pricing with Stochastic Volatility

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  • Petr Jizba
  • Hagen Kleinert
  • Patrick Haener

Abstract

We fit the volatility fluctuations of the S&P 500 index well by a Chi distribution, and the distribution of log-returns by a corresponding superposition of Gaussian distributions. The Fourier transform of this is, remarkably, of the Tsallis type. An option pricing formula is derived from the same superposition of Black-Scholes expressions. An explicit analytic formula is deduced from a perturbation expansion around a Black-Scholes formula with the mean volatility. The expansion has two parts. The first takes into account the non-Gaussian character of the stock-fluctuations and is organized by powers of the excess kurtosis, the second is contract based, and is organized by the moments of moneyness of the option. With this expansion we show that for the Dow Jones Euro Stoxx 50 option data, a Delta-hedging strategy is close to being optimal.

Suggested Citation

  • Petr Jizba & Hagen Kleinert & Patrick Haener, 2007. "Perturbation Expansion for Option Pricing with Stochastic Volatility," Papers 0708.3012, arXiv.org.
    • Handle: RePEc:arx:papers:0708.3012
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    File URL: http://arxiv.org/pdf/0708.3012
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