Sharp Conditions for the CLT of Linear Processes in a Hilbert Space

Sharp Conditions for the CLT of Linear Processes in a Hilbert Space
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希尔伯特空间中线性过程 CLT 的夏普条件

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发表时间:
1997
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通讯作者:
S. Utev
S. Utev
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作者:
F. Merlevède;M. Peligrad;S. Utev

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摘要:在本文中,我们研究了线性过程的和的行为 $$X_k = 总和 {_{j = - infty }^infty } a_j (xi _{k - j} )$$ 与严格平稳序列相关 $${ xi _k } _{k in mathbb{Z}} $$ 具有实数可分离希尔伯特空间中的值,并且 $${ a_k } _{mathbb{Z}} 中的 k $$ 是从 H 到 H 的线性算子。结果之一是 $$总和 {_{i = 1}^n } X_i /sqrt n $$ 满足所提供的 CLT $${ xi _k } _{k in mathbb{Z}} $$ 是 i.i.d.以有限二阶矩为中心,并且 $$sum {_{j = - infty }^infty } 剩余| {a_j} 右|_{L(H)} < infty $$ 。我们将提供一个例子来表明,对运营商的条件本质上是尖锐的。对于弱相关随机变量序列,给出了该结果的扩展 $${ xi _k } _{k in mathbb{Z}} $$ 在最低条件下。
AbstractIn this paper we study the behavior of sums of a linear process $$X_k = sum {_{j = - infty }^infty } a_j (xi _{k - j} )$$ associated to a strictly stationary sequence $${ xi _k } _{k in mathbb{Z}} $$ with values in a real separable Hilbert space and $${ a_k } _{k in mathbb{Z}} $$ are linear operators from H to H. One of the results is that $$sum {_{i = 1}^n } X_i /sqrt n $$ satisfies the CLT provided $${ xi _k } _{k in mathbb{Z}} $$ are i.i.d. centered having finite second moments and $$sum {_{j = - infty }^infty } left| {a_j } ight|_{L(H)} < infty $$ . We shall provide an example which shows that the condition on the operators is essentially sharp. Extensions of this result are given for sequences of weak dependent random variables $${ xi _k } _{k in mathbb{Z}} $$ under minimal conditions.