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arXiv 2602.10484stat.ME
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在渐近独立性框架下计算CoVaR

CoVaR under Asymptotic Independence

Shanghai University of International Business and Economics(上海对外经贸大学);Central University of Finance and Economics(中央财经大学);Fudan University(复旦大学)

Zhaowen Wang, Yutao Liu, Deyuan Li

AI总结:

本文提出了一种半参数方法,在双变量极值理论框架下估计渐近独立对的CoVaR,并通过模拟和实际数据验证了其稳健性和有效性。

摘要:

条件价值在风险(CoVaR)是系统性风险最重要的衡量指标之一。它被定义为在相关变量处于极端值时的高分位数,广泛应用于量化风险管理领域。在本文中,我们开发了一种半参数方法,用于在双变量极值理论框架下估计渐近独立对的CoVaR。我们通过参数建模双变量极值结构来解决联合尾部区域的数据稀疏问题,并证明所提出估计器的一致性和渐近正态性。通过模拟研究展示了估计器的稳健性能。将其应用于美国股票收益率数据产生了有洞察力的动态CoVaR预测。

英文摘要:

Conditional value-at-risk (CoVaR) is one of the most important measures of systemic risk. It is defined as the high quantile conditional on a related variable being extreme, widely used in the field of quantitative risk management. In this work, we develop a semi-parametric methodology to estimate CoVaR for asymptotically independent pairs within the framework of bivariate extreme value theory. We use parametric modelling of the bivariate extremal structure to address data sparsity in the joint tail regions and prove consistency and asymptotic normality of the proposed estimator. The robust performance of the estimator is illustrated via simulation studies. Its application to the US stock returns data produces insightful dynamic CoVaR forecasts.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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