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Sequential Monte Carlo pricing of American-style options under stochastic volatility models

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  • Bhojnarine R. Rambharat
  • Anthony E. Brockwell
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    Abstract

    We introduce a new method to price American-style options on underlying investments governed by stochastic volatility (SV) models. The method does not require the volatility process to be observed. Instead, it exploits the fact that the optimal decision functions in the corresponding dynamic programming problem can be expressed as functions of conditional distributions of volatility, given observed data. By constructing statistics summarizing information about these conditional distributions, one can obtain high quality approximate solutions. Although the required conditional distributions are in general intractable, they can be arbitrarily precisely approximated using sequential Monte Carlo schemes. The drawback, as with many Monte Carlo schemes, is potentially heavy computational demand. We present two variants of the algorithm, one closely related to the well-known least-squares Monte Carlo algorithm of Longstaff and Schwartz [The Review of Financial Studies 14 (2001) 113-147], and the other solving the same problem using a "brute force" gridding approach. We estimate an illustrative SV model using Markov chain Monte Carlo (MCMC) methods for three equities. We also demonstrate the use of our algorithm by estimating the posterior distribution of the market price of volatility risk for each of the three equities.

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    File URL: http://arxiv.org/pdf/1010.1372
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    Bibliographic Info

    Paper provided by arXiv.org in its series Papers with number 1010.1372.

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    Date of creation: Oct 2010
    Date of revision: Jul 2012
    Publication status: Published in Annals of Applied Statistics Vol. 4, No. 1, 222-265 (2010)
    Handle: RePEc:arx:papers:1010.1372

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    1. Peter Carr & Robert Jarrow & Ravi Myneni, 1992. "Alternative Characterizations Of American Put Options," Mathematical Finance, Wiley Blackwell, vol. 2(2), pages 87-106.
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