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Diagnosing affine models of options pricing: Evidence from VIX

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  • Li, Gang
  • Zhang, Chu
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    Abstract

    Affine jump-diffusion models have been the mainstream in options pricing because of their analytical tractability. Popular affine jump-diffusion models, however, are still unsatisfactory in describing the options data and the problem is often attributed to the diffusion term of the unobserved state variables. Using prices of variance-swaps (i.e., squared VIX) implied from options prices, we provide fresh evidence regarding the misspecification of affine jump-diffusion models, as variance-swap prices are affine functions of the state variables in a broader class of models that do not restrict the diffusion term of the state variables. We apply the nonparametric methodology used by Aït-Sahalia (1996b), supplemented with bootstrap tests and other parametric tests, to the S&P 500 index options data from January 1996 to September 2008. We find that, while the affine diffusion term of the state variables may contribute to the misspecification as the literature has suggested, the affine drift of the state variables, jump intensities, and risk premiums are also sources of misspecification.

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    Bibliographic Info

    Article provided by Elsevier in its journal Journal of Financial Economics.

    Volume (Year): 107 (2013)
    Issue (Month): 1 ()
    Pages: 199-219

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    Handle: RePEc:eee:jfinec:v:107:y:2013:i:1:p:199-219

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    Web page: http://www.elsevier.com/locate/inca/505576

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    Keywords: Options pricing; Affine jump-diffusion models; Variance-swap prices;

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