用于超短期期权波动率的跳跃扩散模型
文章 arXiv papers · 作者: Federico M. Bandi et al.
总结
本文介绍 Edgeworth++,一种用于定价到期时间短于一周的期权的模型。研究动机是,在这些短期限内,平值隐含波动率可能大幅波动,使传统方法难以联合定价。该模型结合跳跃扩散动态与非参数随机波动率成分,以捕捉各期限内的波动率微笑,随后加入确定性偏移,以拟合不同期限间的期限结构。
作者推导了过程特征函数的局部展开,并使用标准傅里叶反演以闭式形式为期权定价。他们称该方法快速且准确,并将其与基准模型进行比较讨论。本文未给出基准模型名称、数值结果、数据描述或实施细节,因此仅凭此摘要无法独立评估其所称表现。其明确范围是基于模型对超短期期权进行估值,而非构建交易策略。
核心观点
- 超短期期权的平值隐含波动率在不同期限间会显著波动。
- Edgeworth++ 将跳跃扩散动态与非参数随机波动率结合。
- 确定性偏移扩展使模型能够拟合短期限间的期限结构形状。
- 特征函数的局部展开支持通过傅里叶反演进行闭式定价。
- 本文讨论了基准模型,但未提供定量比较细节。
标签
全文
# Ultra-short-term volatility surfaces # Ultra-short-term volatility surfaces Options with maturities below one week, hereafter "ultra-short-term" options, have seen a sharp increase in trading activity in recent years. Yet, these instruments are difficult to price jointly using classical pricing models due to the pronounced oscillations observed in the at-the-money implied-volatility term structure across ultra-short-term tenors. We propose Edgeworth++, a parsimonious jump-diffusion model featuring a nonparametric stochastic volatility component, which provides flexibility in capturing implied-volatility smiles for each tenor, combined with a deterministic shift extension, which allows the model to fit rich at-the-money implied-volatility shapes across tenors. We derive a local (in tenor) expansion of the process characteristic function suited to value ultra-short-term options. The expansion leads to fast and accurate option pricing in closed form via standard Fourier inversion. We discuss the benefits of the proposed approach relative to benchmarks.
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