12 Pages Posted: 23 Mar 2006 Last revised: 5 May 2008
Date Written: May 1, 2008
This paper presents a closed-form asymptotic variance-covariance matrix of the Quasi-Maximum Likelihood Estimator (QMLE) for the GARCH(1,1) model. The robust 'sandwich' asymptotic variance matrix is shown to be a product of the function of higher moments of innovation and the inverse of negative expected Hessian, whose closed-form in terms of only model parameters is then derived via a local approximation. Taking inverse of it, the variance-covariance matrix is readily obtained. A Monte Carlo simulation experiment demonstrates that this analytical formula works well for both normal and non-normal innovations in admissible parameter regions.
Keywords: GARCH, Quasi-Maximum Likelihood Estimator, asymptotic variance-covariance matrix
JEL Classification: C12, 22
Suggested Citation: Suggested Citation
Ma, Jun, A Closed-Form Asymptotic Variance-Covariance Matrix for the Quasi-Maximum Likelihood Estimator of the Garch(1,1) Model (May 1, 2008). Available at SSRN: https://ssrn.com/abstract=889461 or http://dx.doi.org/10.2139/ssrn.889461