Confidence Intervals for Conditional Tail Risk Measures in ARMA–GARCH Models
ARMA–GARCH 模型中条件尾部风险度量的置信区间AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要直接研究极端条件风险价值与预期短缺,并以 ARMA–GARCH 刻画收益的条件波动,因此对应尾部风险和波动率。
ARMA–GARCH 模型中条件尾部风险度量的置信区间AI 解读 ↓
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ARMA–GARCH models are widely used to model the conditional mean and conditional variance dynamics of returns on risky assets. Empirical results suggest heavy-tailed innovations with positive extreme value index for these models. Hence, one may use extreme value theory to estimate extreme quantiles of residuals. Using weak convergence of the weighted sequential tail empirical process of the residuals, we derive the limiting distribution of extreme conditional Value-at-Risk (CVaR) and conditional expected shortfall (CES) estimates for a wide range of extreme value index estimators. To construct confidence intervals, we propose to use self-normalization. This leads to improved coverage vis-à-vis the normal approximation, while delivering slightly wider confidence intervals. A data-driven choice of the number of upper order statistics in the estimation is suggested and shown to work well in simulations. An application to stock index returns documents the improvements of CVaR and CES forecasts.