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arXiv 0902.0497math.PR
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分数Levy面积的离散化

Discretizing the fractional Levy area

Andreas Neuenkirch, Samy Tindel, Jérémie Unterberger

摘要:

在这篇文章中,我们给出了尖锐的界限欧拉和梯形离散的Levy面积与d维分数布朗运动。我们表明,有三个不同的制度的确切均方根收敛速度的欧拉计划。对于H<3/4,精确的收敛速度是n^{-2H+1/2},其中n表示离散子区间的数目,而对于H=3/4,它是n^{-1}(log(n))^{1/2},对于H>3/4,精确的收敛速度是n^{-1}。当H>1/2时,梯形格式具有精确的收敛速度n^{-2 H +1/2}.最后,我们还导出了欧拉格式的渐近误差分布。当H小于3/4时,得到高斯极限,而当H>3/4时,极限分布是Rosenblatt型的。

英文摘要:

In this article, we give sharp bounds for the Euler- and trapezoidal discretization of the Levy area associated to a d-dimensional fractional Brownian motion. We show that there are three different regimes for the exact root mean-square convergence rate of the Euler scheme. For H<3/4 the exact convergence rate is n^{-2H+1/2}, where n denotes the number of the discretization subintervals, while for H=3/4 it is n^{-1} (log(n))^{1/2} and for H>3/4 the exact rate is n^{-1}. Moreover, the trapezoidal scheme has exact convergence rate n^{-2H+1/2} for H>1/2. Finally, we also derive the asymptotic error distribution of the Euler scheme. For H lesser than 3/4 one obtains a Gaussian limit, while for H>3/4 the limit distribution is of Rosenblatt type.

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