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arXiv 1301.4832q-fin.RMcs.ITmath.IT
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衡量模型风险

Measuring Model Risk

Thomas Breuer, Imre Csiszar

摘要:

我们建议将分布模型风险解释为预期损失对风险因子分布变化的敏感性,并通过最大预期损失来衡量投资组合的分布模型风险。发散度可以是相对熵、Bregman距离或$f$ -发散度。我们给出了计算分布模型风险的公式,并明确确定了最坏情况下的分布从一组合理的分布。我们还给出了公式描述模糊厌恶决策者的分歧偏好的评估。

英文摘要:

We propose to interpret distribution model risk as sensitivity of expected loss to changes in the risk factor distribution, and to measure the distribution model risk of a portfolio by the maximum expected loss over a set of plausible distributions defined in terms of some divergence from an estimated distribution. The divergence may be relative entropy, a Bregman distance, or an $f$-divergence. We give formulas for the calculation of distribution model risk and explicitly determine the worst case distribution from the set of plausible distributions. We also give formulas for the evaluation of divergence preferences describing ambiguity averse decision makers.

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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