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arXiv 2201.06787math.STstat.TH
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小Lévy噪声下随机微分方程基于Adams方法的最小二乘估计

Least squares estimators based on the Adams method for stochastic differential equations with small Lévy noise

Mitsuki Kobayashi, Yasutaka Shimizu

摘要:

研究了由小Lévy噪声驱动的具有未知参数的随机微分方程,提出了一种新的基于离散样本的最小二乘估计.为了从偏微分方程近似过程的增量,我们将不使用通常的欧拉法,而是使用亚当斯方法,即,一种众所周知的数值逼近,它可以近似出现在微分方程极限的常微分方程的解。我们证明了所提出的估计的一致性以及在一个合适的观测方案的渐近分布。我们还表明,我们的估计可以更好地基于欧拉法在有限样本性能通常的LSE。

英文摘要:

We consider stochastic differential equations (SDEs) driven by small Lévy noise with some unknown parameters, and propose a new type of least squares estimators based on discrete samples from the SDEs. To approximate the increments of a process from the SDEs, we shall use not the usual Euler method, but the Adams method, that is, a well-known numerical approximation of the solution to the ordinary differential equation appearing in the limit of the SDE. We show the consistency of the proposed estimators as well as the asymptotic distribution in a suitable observation scheme. We also show that our estimators can be better than the usual LSE based on the Euler method in the finite sample performance.

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