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首页> 外文期刊>AESTIMATIO: the IEB International Journal of Finance >Measuring market risk under the basel accords: VaR, stressed VaR, and expected shortfall
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Measuring market risk under the basel accords: VaR, stressed VaR, and expected shortfall

机译:根据巴塞尔协议衡量市场风险:风险价值,压力风险价值和预期缺口

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Each of the most recent accords of the Basel Committee on Banking Regulation, known as Basel II, 2.5, and III, has embraced a different primary measure of market risk in global banking regulation: traditional value-at-risk (VaR), stressed VaR, and expected shortfall. After introducing the mathematics of VaR and expected shortfall, this article will evaluate how well the reforms embraced by Basel 2.5 and III ?a stressed VaR and expected shortfall ?a have addressed longstanding regulatory concerns with traditional VaR. Expected shortfall, but not VaR, provides a coherent measure of risk. On the other hand, VaR, but not expected shortfall (or, for that matter, nearly every other general spectral measure of risk), satisfies the mathematical requirement of "elicitability." Mathematical limitations on measures of risk therefore force regulators and bankers to choose between coherence and elicitability, between theoretically sound consolidation of diverse risks and reliable backtesting of risk forecasts against historical observations.
机译:巴塞尔银行监管委员会的最新协议中的每一项,即巴塞尔协议II,2.5和III,在全球银行监管中都采用了不同的主要市场风险度量标准:传统的风险价值(VaR),强调的VaR ,以及预期的缺口。在介绍了VaR的数学模型和预期的不足之后,本文将评估巴塞尔协议2.5和IIIa强调的VaR和预期的不足之处所进行的改革如何解决了传统VaR长期存在的监管问题。预期的短缺而不是VaR不能提供连贯的风险度量。另一方面,VaR满足了数学上的“可引诱性”要求,但并不是预期的不足(或者就此而言,几乎所有其他通用的风险度量标准)。因此,风险度量的数学局限性迫使监管者和银行家必须在一致性和可预测性之间进行选择,既要在理论上合理地整合各种风险,又要根据历史观察对风险预测进行可靠的回测。

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