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arXiv 1401.4787q-fin.RMq-fin.STstat.APstat.OT
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经济尾部风险的度量

On the Measurement of Economic Tail Risk

Steven Kou, Xianhua Peng

摘要:

本文试图为经济尾部风险的度量提供一个决策理论基础。尾部风险不仅与效用理论密切相关,而且与统计模型的不确定性密切相关。主要结果是,唯一的风险措施,满足一组经济公理的Choquet期望效用和elicitability的统计性质(即存在一个目标函数,使最小化的预期目标函数产生的风险措施)是平均功能和中位数短缺,这是尾部损失分布的中位数。启发性对于回溯测试很重要。我们还扩展了结果,以解决模型的不确定性,结合多个场景。作为一个应用,我们认为,中值短缺是一个更好的替代比预期损失设置资本要求的巴塞尔协议。

英文摘要:

This paper attempts to provide a decision-theoretic foundation for the measurement of economic tail risk, which is not only closely related to utility theory but also relevant to statistical model uncertainty. The main result is that the only risk measures that satisfy a set of economic axioms for the Choquet expected utility and the statistical property of elicitability (i.e. there exists an objective function such that minimizing the expected objective function yields the risk measure) are the mean functional and the median shortfall, which is the median of tail loss distribution. Elicitability is important for backtesting. We also extend the result to address model uncertainty by incorporating multiple scenarios. As an application, we argue that median shortfall is a better alternative than expected shortfall for setting capital requirements in Basel Accords.

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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