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General approximation schemes for option prices in stochastic volatility models

Författare:
Publiceringsår: 2012
Språk: Engelska
Sidor: 873-891
Publikation/Tidskrift/Serie: Quantitative Finance
Volym: 12
Nummer: 6
Dokumenttyp: Artikel
Förlag: Routledge Journals, Taylor & Francis Ltd

Sammanfattning

In this paper we develop a general method for deriving closed-form approximations of European option prices and equivalent implied volatilities in stochastic volatility models. Our method relies on perturbations of the model dynamics and we show how the expansion terms can be calculated using purely probabilistic methods. A flexible way of approximating the equivalent implied volatility from the basic price expansion is also introduced. As an application of our method we derive closed-form approximations for call prices and implied volatilities in the Heston Rev. Financial Stud., 1993, 6, 327-343 model. The accuracy of these approximations is studied and compared with numerically obtained values.

Disputation

Nyckelord

  • Business and Economics
  • Applied mathematical finance
  • Stochastic volatility
  • Option pricing
  • Stochastic applications

Övrigt

Published
Yes
  • ISSN: 1469-7688

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