Quasi-Maximum Likelihood Estimation of GARCH Models With Heavy-Tailed Likelihoods
采用重尾似然的 GARCH 模型拟极大似然估计AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要讨论捕捉重尾收益的 GARCH 模型及其拟极大似然估计,研究对象直接是金融波动率模型,因此归入波动率方向。
采用重尾似然的 GARCH 模型拟极大似然估计AI 解读 ↓
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The non-Gaussian maximum likelihood estimator is frequently used in GARCH models with the intention of capturing heavy-tailed returns. However, unless the parametric likelihood family contains the true likelihood, the estimator is inconsistent due to density misspecification. To correct this bias, we identify an unknown scale parameter ηf that is critical to the identification for consistency and propose a three-step quasi-maximum likelihood procedure with non-Gaussian likelihood functions. This novel approach is consistent and asymptotically normal under weak moment conditions. Moreover, it achieves better efficiency than the Gaussian alternative, particularly when the innovation error has heavy tails. We also summarize and compare the values of the scale parameter and the asymptotic efficiency for estimators based on different choices of likelihood functions with an increasing level of heaviness in the innovation tails. Numerical studies confirm the advantages of the proposed approach.