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arXiv 2409.00524math.NAcs.NA
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一种用于扩散过程有效弱逼近的扩展Milstein格式

An extended Milstein scheme for effective weak approximation of diffusions

Yuga Iguchi, Toshihiro Yamada

AI总结:

本文提出一种扩展Milstein格式,以与EM格式相同的随机变量数量实现一阶弱收敛,并通过减少前导阶误差项在含小参数的扩散系数情形及亚式期权定价中显著降低弱误差。

摘要:

我们提出一种直接且有效的方法,用于离散化多维扩散过程,作为Milstein格式的扩展。新格式以显式形式给出,并可使用高斯随机变量进行模拟,所需随机变量数量与Euler-Maruyama(EM)格式相同。我们证明所提格式具有一阶弱收敛速率,这与EM/Milstein等经典格式一致,但涉及更少的前导阶误差项。由于误差项的减少,所提格式有望比其他一阶格式提供更精确的估计。我们证明,当扩散系数包含一个小参数时,与EM/Milstein格式相比,新格式的弱误差得到有效降低。我们在金融领域对亚式期权定价进行了模拟研究,结果表明我们所提格式显著优于EM/Milstein格式,而有趣的是,我们发现EM格式与Milstein格式之间在性能上没有差异。

英文摘要:

We propose a straightforward and effective method for discretizing multi-dimensional diffusion processes as an extension of Milstein scheme. The new scheme is explicitly given and can be simulated using Gaussian variates, requiring the same number of random variables as Euler-Maruyama (EM) scheme. We show that the proposed scheme has a weak convergence rate of one, which is consistent with other classical schemes like EM/Milstein schemes but involves fewer leading-order error terms. Due to the reduction of the error terms, the proposed scheme is expected to provide a more accurate estimation than alternative first-order schemes. We demonstrate that the weak error of the new scheme is effectively reduced compared with EM/Milstein schemes when the diffusion coefficients involve a small parameter. We conduct simulation studies on Asian option pricing in finance to showcase that our proposed scheme significantly outperforms EM/Milstein schemes, while interestingly, we find no differences in the performance between EM and Milstein schemes.

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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