arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2312.03444q-fin.MFmath.PR

基于签名的原始与对偶最优停时

Primal and dual optimal stopping with signatures

Christian Bayer, Luca Pelizzari, John Schoenmakers

AI总结:

本文提出两种基于粗糙路径签名的方法,将最优停时问题求解推广到非马尔可夫框架,分别推广 Longstaff-Schwartz 算法和参数化对偶鞅空间,并证明收敛性及给出数值验证。

摘要:

我们提出两种基于签名的方法,用于在非马尔可夫框架下求解最优停时问题——即美式期权定价。两种方法都依赖于粗糙路径空间上 $L^p$ 泛函的全局逼近结果,使用稳健的粗糙路径签名的线性泛函。在原始形式中,我们提出了著名的 Longstaff-Schwartz 算法的非马尔可夫推广,使用签名的线性泛函作为回归基。对于对偶形式,我们使用签名的线性泛函参数化平方可积鞅空间,并应用样本平均逼近。我们证明了两种方法的收敛性,并在非马尔可夫和非半鞅情形下给出了首批数值示例。

英文摘要:

We propose two signature-based methods to solve the optimal stopping problem - that is, to price American options - in non-Markovian frameworks. Both methods rely on a global approximation result for $L^p-$functionals on rough path-spaces, using linear functionals of robust, rough path signatures. In the primal formulation, we present a non-Markovian generalization of the famous Longstaff-Schwartz algorithm, using linear functionals of the signature as regression basis. For the dual formulation, we parametrize the space of square-integrable martingales using linear functionals of the signature, and apply a sample average approximation. We prove convergence for both methods and present first numerical examples in non-Markovian and non-semimartingale regimes.

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。

↑