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用于联合校准 SPX 与 VIX 波动率微笑的五次 Ornstein-Uhlenbeck 模型

文章 arXiv papers · 作者: Eduardo Abi Jaber et al.

总结

本文介绍一种随机波动率模型,其中波动率是单一的快速均值回归 Ornstein-Uhlenbeck 过程的五次多项式,且波动率的波动幅度较大。该模型旨在联合拟合 SPX 和 VIX 波动率微笑,使用少量有效参数和一条输入曲线来匹配选定期限结构。作者还研究其他输入曲线设定和时变参数,以改善一年以上期限的拟合。

该模型的计算设计支持实际定价:平方后的 VIX 是 Ornstein-Uhlenbeck 状态的多项式,因此可通过对高斯密度积分来为 VIX 衍生品定价。波动率可精确模拟;而 SPX 衍生品可通过采用方差缩减技术的蒙特卡洛方法定价。摘录报告称模型具有较强的联合拟合能力,但未提供校准数据、误差指标或与其他模型的比较,因此无法据此评估拟合质量和普适性。

核心观点

  • 模型将波动率设定为单个 Ornstein-Uhlenbeck 过程的五次多项式。
  • 该模型旨在通过紧凑的参数化联合校准 SPX 和 VIX 波动率微笑。
  • 其他输入曲线和时变参数有助于匹配期限结构和较长期限。
  • 平方后 VIX 的多项式形式支持高效的 VIX 衍生品定价。
  • 该模型提出将波动率精确模拟和方差缩减蒙特卡洛用于定价。

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# The quintic Ornstein-Uhlenbeck volatility model that jointly calibrates SPX & VIX smiles


# The quintic Ornstein-Uhlenbeck volatility model that jointly calibrates SPX & VIX smiles









The quintic Ornstein-Uhlenbeck volatility model is a stochastic volatility model where the volatility process is a polynomial function of degree five of a single Ornstein-Uhlenbeck process with fast mean reversion and large vol-of-vol. The model is able to achieve remarkable joint fits of the SPX-VIX smiles with only 6 effective parameters and an input curve that allows to match certain term structures. We provide several practical specifications of the input curve, study their impact on the joint calibration problem and consider additionally time-dependent parameters to help achieve better fits for longer maturities going beyond 1 year. Even better, the model remains very simple and tractable for pricing and calibration: the VIX squared is again polynomial in the Ornstein-Uhlenbeck process, leading to efficient VIX derivative pricing by a simple integration against a Gaussian density; simulation of the volatility process is exact; and pricing SPX products derivatives can be done efficiently and accurately by standard Monte Carlo techniques with suitable antithetic and control variates.

在遵守原作品许可的前提下,附作者信息全文展示。 许可协议: abstract CC0

此摘要由 Stratmill 研究智能体根据原文撰写,并非原文副本。