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Chinese Journal of Management Science ›› 2013, Vol. ›› Issue (1): 1-7.

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Option Pricing under Non-Affine Stochastic Volatility Model

WU Xin-yu1, YANG Wen-yu2, MA Chao-qun2, WANG Shou-yang3   

  1. 1. School of Finance, Anhui University of Finance and Economics, Bengbu 233030, China;
    2. School of Business Administration, Hunan University, Changsha 410082, China;
    3. Academy of Mathematics and Systems Science, Chinese Academy of Sciences, Beijing 100190, China
  • Received:2011-10-11 Revised:2012-07-17 Online:2013-02-28 Published:2013-02-26

Abstract: By applying the fast Fourier transform (FFT) method, the problem of option pricing when the underlying asset follows the non-affine stochastic volatility models is considered in this paper. Firstly, by utilizing a perturbation method to the partial differential equation of the characteristic function for the underlying log-asset price, an approximate solution for the characteristic function is derived. Then, a quasi-analytical approximate formula for European options is attained by means of Fourier transform and its inverse. This formula is easy to implement and can be accurately and quickly computed by the FFT algorithm. Numerical examples show that the FFT-based option pricing method is very accurate and efficient. Finally, an empirical study of call warrants on Hang Seng index is presented. Empirical results demonstrate that the non-affine stochastic volatility option pricing model is more accurate than the classical Black-Scholes model.

Key words: option pricing, non-affine stochastic volatility, fast Fourier transform, perturbation method

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