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arXiv 0909.0439math.STstat.TH
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随机过程半参数$Z$ -估计的渐近理论及其在遍历扩散和时间序列中的应用

Asymptotic theory of semiparametric $Z$-estimators for stochastic processes with applications to ergodic diffusions and time series

Yoichi Nishiyama

摘要:

本文将主要在现代经验过程背景下发展起来的$Z$ -估计理论的一部分推广到随机过程的情况,典型的是半鞅。本文给出了一个一般定理,当$Ψ_n$的补偿器是随机的时,得到了具有抽象冗余参数$h$的估计方程$θ\leadsto Ψ_n(θ,\widehat{h}_n)=0$解的渐近性态.作为其应用,我们考虑了遍历扩散过程模型中的估计问题,其中漂移系数包含一个未知的,有限维的参数$θ$和扩散系数是由冗余参数$h$从无限维空间索引。冗余参数空间的一个例子是一类光滑函数。我们建立了漂移系数的$Z$ -估计的渐近正态性和有效性。作为另一个应用,我们也提出了一个类似的结果在遍历时间序列模型。

英文摘要:

This paper generalizes a part of the theory of $Z$-estimation which has been developed mainly in the context of modern empirical processes to the case of stochastic processes, typically, semimartingales. We present a general theorem to derive the asymptotic behavior of the solution to an estimating equation $θ\leadsto Ψ_n(θ,\widehat{h}_n)=0$ with an abstract nuisance parameter $h$ when the compensator of $Ψ_n$ is random. As its application, we consider the estimation problem in an ergodic diffusion process model where the drift coefficient contains an unknown, finite-dimensional parameter $θ$ and the diffusion coefficient is indexed by a nuisance parameter $h$ from an infinite-dimensional space. An example for the nuisance parameter space is a class of smooth functions. We establish the asymptotic normality and efficiency of a $Z$-estimator for the drift coefficient. As another application, we present a similar result also in an ergodic time series model.

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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