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arXiv 1202.2964math.PR
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关于鞅逼近和猝灭弱不变原理

On martingale approximations and the quenched weak invariance principle

Christophe Cuny, Florence Merlevède

摘要:

本文利用投影准则给出了在${\mathcal{H}}$(一个实的可分希尔伯特空间)中平稳过程的部分和在${\mathbb{L}}^p({\mathcal{H}})$,$p>1$中可由平稳差鞅逼近的充分条件,并估计了在${\mathbb{L}}^p({\mathcal{H}})$中逼近的误差.结果被用来进一步研究部分和的行为。特别地,我们得到了关于Marcinkiewicz-Zygmund定理,中偏差原理和中心极限定理中的速率的新的投影条件.这些条件非常适合于各种各样的例子,包括线性过程或各种弱相关或混合过程。此外,我们的方法适合通过鞅近似来研究淬火中心极限定理及其不变原理,并允许我们证明它们在所谓的Maxwell-Woodroofe条件下是最优的。

英文摘要:

In this paper, we obtain sufficient conditions in terms of projective criteria under which the partial sums of a stationary process with values in ${\mathcal{H}}$ (a real and separable Hilbert space) admits an approximation, in ${\mathbb{L}}^p({\mathcal{H}})$, $p>1$, by a martingale with stationary differences, and we then estimate the error of approximation in ${\mathbb{L}}^p({\mathcal{H}})$. The results are exploited to further investigate the behavior of the partial sums. In particular we obtain new projective conditions concerning the Marcinkiewicz-Zygmund theorem, the moderate deviations principle and the rates in the central limit theorem in terms of Wasserstein distances. The conditions are well suited for a large variety of examples, including linear processes or various kinds of weak dependent or mixing processes. In addition, our approach suits well to investigate the quenched central limit theorem and its invariance principle via martingale approximation, and allows us to show that they hold under the so-called Maxwell-Woodroofe condition that is known to be optimal.

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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