arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 1107.4632q-fin.RMmath.PRq-fin.GN
收藏

从微笑渐近到市场风险度量

From Smile Asymptotics to Market Risk Measures

Ronnie Sircar, Stephan Sturm

摘要:

隐含波动率偏斜的左尾来自价外看跌期权的报价,可以被认为反映了市场对股价大幅下跌风险的评估。我们分析了如何将这些市场信息整合到凸货币风险度量的理论框架中。特别是,我们利用无差异定价的动态凸风险措施,这是倒向随机微分方程(BSDES)的解决方案,建立这两种方法之间的联系,风险度量。我们推导出一个非线性偏微分方程的解的隐含波动率的特征,并提供了一个小的时间到到期日的扩展和数值解。这个过程允许选择凸风险措施在一个方便的参数化类,扭曲熵动态风险措施,我们在这里介绍,这样的渐近波动率偏斜下无差别定价可以匹配的市场偏斜。我们证明了这一点,在市场隐含波动率数据的校准练习。

英文摘要:

The left tail of the implied volatility skew, coming from quotes on out-of-the-money put options, can be thought to reflect the market's assessment of the risk of a huge drop in stock prices. We analyze how this market information can be integrated into the theoretical framework of convex monetary measures of risk. In particular, we make use of indifference pricing by dynamic convex risk measures, which are given as solutions of backward stochastic differential equations (BSDEs), to establish a link between these two approaches to risk measurement. We derive a characterization of the implied volatility in terms of the solution of a nonlinear PDE and provide a small time-to-maturity expansion and numerical solutions. This procedure allows to choose convex risk measures in a conveniently parametrized class, distorted entropic dynamic risk measures, which we introduce here, such that the asymptotic volatility skew under indifference pricing can be matched with the market skew. We demonstrate this in a calibration exercise to market implied volatility data.

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。

↑