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arXiv 2008.05353math.STstat.TH
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小噪声下抛物线性SPDE的自适应估计器

Adaptive estimator for a parabolic linear SPDE with a small noise

Yusuke Kaino, Masayuki Uchida

摘要:

研究了一类具有小弥散参数的二阶抛物型线性随机偏微分方程(SPDE)的参数估计问题.利用从高频数据中得到的关于空间的稀疏数据,提出了SPDE两个系数参数的最小对比度估计。利用这些估计量和从高频数据中得到的关于时间的稀疏数据,我们构造了SPDE坐标过程的近似。利用近似坐标过程,我们得到了SPDE系数参数的自适应估计。此外,我们给出了模拟结果的估计的SPDE。

英文摘要:

We deal with parametric estimation for a parabolic linear second order stochastic partial differential equation (SPDE) with a small dispersion parameter based on high frequency data which are observed in time and space. By using the thinned data with respect to space obtained from the high frequency data, the minimum contrast estimators of two coefficient parameters of the SPDE are proposed. With these estimators and the thinned data with respect to time obtained from the high frequency data, we construct an approximation of the coordinate process of the SPDE. Using the approximate coordinate process, we obtain the adaptive estimator of a coefficient parameter of the SPDE. Moreover, we give simulation results of the proposed estimators of the SPDE.

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