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Faculty of Economics

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Harvey, A. C.

Exponential Conditional Volatility Models


Abstract: The asymptotic distribution of maximum likelihood estimators is derived for a class of exponential generalized autoregressive conditional heteroskedasticity (EGARCH) models. The result carries over to models for duration and realised volatility that use an exponential link function. A key feature of the model formulation is that the dynamics are driven by the score.

Keywords: Duration models, gamma distribution, general error distribution, heteroskedasticity, leverage, score, Student's t

JEL Codes: C22 G17

Author links: Andrew Harvey  


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