Pricing Australian S&P200 Options: A Bayesian Approach Based on Generalized Distributional Forms
A new class of option price models is developed and applied to options on the Australian S&P200 Index. The class of models generalizes the traditional Black-Scholes framework by accommodating time-varying conditional volatility, skewness and excess kurtosis in the underlying returns process. An important property of the more general pricing models is that the computational requirements are practically the same as those associated with the Black-Scholes model, with both methods being based on one-dimensional integrals. Bayesian inferential methods are used to evaluate a range of models nested in the general framework, using observed market option prices. The evaluation is based on posterior distributions estimated for the parameters of the alternative models, as well as posterior model probabilities, out-of-sample predictive performance and implied volatility smiles. The empirical results provide strong evidence that time-varying volatility, leptokurtosis and skewness are priced in Australian stock market options.
|Date of creation:||Feb 2003|
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