Abstract
We consider extreme value theory for stochastic volatility processes in both cases of light-tailed and heavy-tailed noise. First, the asymptotic behavior of the tails of the marginal distribution is described for the two cases when the noise distribution is Gaussian or heavy-tailed. The sequence of point processes, based on the locations of the suitable normalized observations from a stochastic volatility process, converges in distribution to a Poisson process. From the point process convergence, a variety of limit results for extremes can be derived. Of special note, there is no extremal clustering for stochastic volatility processes in both the light- and heavy-tailed cases. This property is in sharp contrast with GARCH processes which exhibit extremal clustering (i.e., large values of the process come in clusters).
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Davis, R.A., Mikosch, T. (2009). Extremes of Stochastic Volatility Models. In: Mikosch, T., Kreiß, JP., Davis, R., Andersen, T. (eds) Handbook of Financial Time Series. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-71297-8_15
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DOI: https://doi.org/10.1007/978-3-540-71297-8_15
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