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arXiv 2201.09036math.STstat.TH
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基于高频数据的二维线性抛物型随机偏微分方程参数估计

Parameter estimation for linear parabolic SPDEs in two space dimensions based on high frequency data

Yozo Tonaki, Yusuke Kaino, Masayuki Uchida

摘要:

研究了二维线性抛物型二阶随机偏微分方程(SPDE)的参数估计问题,该方程由两类$Q$ -Wiener过程驱动,基于时空高频数据.首先利用稀疏化后的数据,利用最小对比度估计器估计出SPDE坐标过程中出现的参数,然后构造出SPDE的近似坐标过程。此外,我们提出了估计的系数参数的SPDE利用近似坐标过程的基础上,相对于时间的细化数据。我们也给出了一些模拟结果。

英文摘要:

We consider parameter estimation for a linear parabolic second-order stochastic partial differential equation (SPDE) in two space dimensions driven by two types $Q$-Wiener processes based on high frequency data in time and space. We first estimate the parameters which appear in the coordinate process of the SPDE using the minimum contrast estimator based on the thinned data with respect to space, and then construct an approximate coordinate process of the SPDE. Furthermore, we propose estimators of the coefficient parameters of the SPDE utilizing the approximate coordinate process based on the thinned data with respect to time. We also give some simulation results.

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