Sharp Conditions for the CLT of Linear Processes in a Hilbert Space
Sharp Conditions for the CLT of Linear Processes in a Hilbert Space
复制标题
希尔伯特空间中线性过程 CLT 的夏普条件
DOI:
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发表时间:
1997
期刊:
影响因子:
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通讯作者:
S. Utev
中科院分区:
文献类型:
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作者:
F. Merlevède;M. Peligrad;S. Utev
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.