Inference in Arch and Garch Models with Heavy-Tailed Errors
重尾误差下 ARCH 与 GARCH 模型的推断AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要明确围绕 ARCH、GARCH 的条件二阶矩及重尾金融时间序列展开,因此归入金融波动率模型的估计与推断方向。
重尾误差下 ARCH 与 GARCH 模型的推断AI 解读 ↓
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ARCH and GARCH models directly address the dependency of conditional second moments, and have proved particularly valuable in modelling processes where a relatively large degree of fluctuation is present. These include financial time series, which can be particularly heavy tailed. However, little is known about properties of ARCH or GARCH models in the heavy–tailed setting, and no methods are available for approximating the distributions of parameter estimators there. In this paper we show that, for heavy–tailed errors, the asymptotic distributions of quasi–maximum likelihood parameter estimators in ARCH and GARCH models are nonnormal, and are particularly difficult to estimate directly using standard parametric methods. Standard bootstrap methods also fail to produce consistent estimators. To overcome these problems we develop percentile–t, subsample bootstrap approximations to estimator distributions. Studentizing is employed to approximate scale, and the subsample bootstrap is used to estimate shape. The good performance of this approach is demonstrated both theoretically and numerically.