NM-QELE for ARMA-GARCH models with non-Gaussian innovations

Although the quasi maximum likelihood estimator based on Gaussian density (Gaussian-QMLE) is widely used to estimate parameters in ARMA models with GARCH innovations (ARMA-GARCH models), it does not perform successfully when error distribution of ARMA-GARCH models is either skewed or leptokurtic. In order to circumvent such defects, Lee and Lee (submitted for publication) proposed the quasi maximum estimated-likelihood estimator using Gaussian mixture-based likelihood (NM-QELE) for GARCH models. In this paper, we adopt the NM-QELE method for estimating parameters in ARMA-GARCH models and demonstrate the validity of NM-QELE by verifying its consistency.