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Granularity adjustment for risk measures: Systematic vs unsystematic risks

机译:风险度量的粒度调整:系统风险与非系统风险

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摘要

The granularity principle (Gordy, 2003) [17] allows for closed form expressions of the risk measures of a large portfolio at order 1, where n is the portfolio size. The granularity principle yields a decomposition of such risk measures that highlights the different effects of systematic and unsystematic risks. This paper derives the granularity adjustment of the Value-at-Risk (VaR), the Expected Shortfall and the other distortion risk measures for both static and dynamic risk factor models. The systematic factor can be multidimensional. The methodology is illustrated by several examples, such as the stochastic drift and volatility model, or the dynamic factor model for joint analysis of default and loss given default.
机译:粒度原理(Gordy,2003年)[17]允许以1 / n的阶数表示大型投资组合的风险度量的封闭式表达式,其中n是投资组合的大小。粒度原则对此类风险度量进行了分解,突出了系统性风险和非系统性风险的不同影响。本文推导了静态和动态风险因素模型的风险值(VaR)的粒度调整,预期缺口和其他失真风险度量。系统因素可以是多维的。通过几个示例来说明该方法,例如随机漂移和波动率模型,或用于违约和给定违约损失的联合分析的动态因子模型。

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