Tail approximations of integrals of Gaussian random fields
Tail approximations of integrals of Gaussian random fields
复制标题
高斯随机场积分的尾部近似
DOI:
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发表时间:
2010
期刊:
影响因子:
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通讯作者:
Jingcheng Liu
中科院分区:
文献类型:
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作者:
Jingcheng Liu
This paper develops asymptotic approximations of P(∫Tef(t) dt > b) as b → ∞ for a homogeneous smooth Gaussian random field, f, living on a compact d-dimensional Jordan measurable set T. The integral of an exponent of a Gaussian random field is an important random variable for many generic models in spatial point processes, portfolio risk analysis, asset pricing and so forth.
The analysis technique consists of two steps: 1. evaluate the tail probability P(∫Ξef(t) dt > b) over a small domain Ξ depending on b, where mes(Ξ) → 0 as b → ∞ and mes(⋅) is the Lebesgue measure; 2. with Ξ appropriately chosen, we show that P(∫Tef(t) dt > b) = (1 + o(1)) mes(T) mes−1(Ξ) P(∫Ξef(t) dt > b).