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arXiv 1809.09268q-fin.RMmath.OCmath.PRq-fin.MF
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风险测度优化中的鲁棒性

Robustness in the Optimization of Risk Measures

Paul Embrechts, Alexander Schied, Ruodu Wang

摘要:

我们在定量风险管理和优化的背景下研究鲁棒性问题。我们开发了一个通用的方法来确定是否一个给定的风险度量相关的优化问题是强大的,我们称之为“鲁棒性对优化”。新的概念研究了各类风险措施和期望效用和损失函数。受金融监管实际问题的启发,特别关注业界最广泛使用的两种风险度量方法,即风险价值(VaR)和预期损失(ES)。我们建立了一类一般的优化问题,风险值导致非鲁棒优化,而凸风险措施一般导致强大的。我们的研究结果提供了额外的见解正在进行的讨论的比较优势,风险值和ES在银行和保险监管。我们的鲁棒性的概念是概念上不同的鲁棒优化领域,其中一些有趣的链接。

英文摘要:

We study issues of robustness in the context of Quantitative Risk Management and Optimization. We develop a general methodology for determining whether a given risk measurement related optimization problem is robust, which we call "robustness against optimization". The new notion is studied for various classes of risk measures and expected utility and loss functions. Motivated by practical issues from financial regulation, special attention is given to the two most widely used risk measures in the industry, Value-at-Risk (VaR) and Expected Shortfall (ES). We establish that for a class of general optimization problems, VaR leads to non-robust optimizers whereas convex risk measures generally lead to robust ones. Our results offer extra insight on the ongoing discussion about the comparative advantages of VaR and ES in banking and insurance regulation. Our notion of robustness is conceptually different from the field of robust optimization, to which some interesting links are derived.

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