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arXiv 1004.5524q-fin.RMmath.PR
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模型不确定性下的风险度量

Risk measuring under model uncertainty

Jocelyne Bion-Nadal, Magali Kervarec

摘要:

本文的研究框架是不确定性下的风险度量,即不给出参考概率测度时的风险度量。对于${\cal C}_b(Ω)$上的每一个正则凸风险测度,我们关联了Borel集上的概率测度的唯一等价类,刻画了${\cal C}_b(Ω)$的无风险非正元素.我们证明了凸风险测度具有一个对偶表示,它具有一个可数的概率测度集,这些概率测度关于这类中的某个概率测度是绝对连续的。为了得到这些结果,我们研究了Banach空间$L^1(c)$与容量$c$相关联的对偶的拓扑性质。作为应用,我们得到了每个$G$ -期望$\E$都有一个表示,该表示具有关于概率测度$P$绝对连续的可数概率测度集,使得$P(|f|)=0$当且仅当$\E(|f|)=0$ .我们也将我们的结果的情况下,不确定的波动。

英文摘要:

The framework of this paper is that of risk measuring under uncertainty, which is when no reference probability measure is given. To every regular convex risk measure on ${\cal C}_b(Ω)$, we associate a unique equivalence class of probability measures on Borel sets, characterizing the riskless non positive elements of ${\cal C}_b(Ω)$. We prove that the convex risk measure has a dual representation with a countable set of probability measures absolutely continuous with respect to a certain probability measure in this class. To get these results we study the topological properties of the dual of the Banach space $L^1(c)$ associated to a capacity $c$. As application we obtain that every $G$-expectation $\E$ has a representation with a countable set of probability measures absolutely continuous with respect to a probability measure $P$ such that $P(|f|)=0$ iff $\E(|f|)=0$. We also apply our results to the case of uncertain volatility.

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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