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arXiv 2104.07718q-fin.RM
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序约束下相依不确定性下的风险聚集

Risk Aggregation under Dependence Uncertainty and an Order Constraint

Yuyu Chen, Liyuan Lin, Ruodu Wang

摘要:

我们研究了两个风险的聚集,当边际分布是已知的,依赖结构是未知的,在附加的约束下,一个风险小于或等于其他。风险聚集问题的顺序约束是密切相关的最近引入的概念的方向较低(DL)的耦合。通过DL耦合获得凹序中的最大聚合风险(因此,凸序中的最小聚合风险)。这些结果进一步推广到计算最佳情况和最坏情况下的值的尾部风险措施。特别是,我们得到的分析公式的风险价值的界限。我们的数值结果表明,具有额外阶约束的风险度量的新界可以大大改善具有完全依赖不确定性的风险度量。

英文摘要:

We study the aggregation of two risks when the marginal distributions are known and the dependence structure is unknown, under the additional constraint that one risk is smaller than or equal to the other. Risk aggregation problems with the order constraint are closely related to the recently introduced notion of the directional lower (DL) coupling. The largest aggregate risk in concave order (thus, the smallest aggregate risk in convex order) is attained by the DL coupling. These results are further generalized to calculate the best-case and worst-case values of tail risk measures. In particular, we obtain analytical formulas for bounds on Value-at-Risk. Our numerical results suggest that the new bounds on risk measures with the extra order constraint can greatly improve those with full dependence uncertainty.

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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