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arXiv 0904.0966math.PRmath.STstat.TH
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二元尺度混合分布的精确渐近性

Exact Asymptotics of Bivariate Scale Mixture Distributions

Enkelejd Hashorva

摘要:

设(RU_1,RU_2)是给定的二元尺度混合随机向量,其中R>0与二元随机向量(U_1,U_2)无关.本文在假定R在Gumbel最大吸引区域内具有分布函数,且(U_1,U_2)在某个吸收点附近具有特定的尾部行为的条件下,导出了尾概率P{RU_1> x,RU_2> ax},a \in(0,1)当x趋于无穷大时的精确渐近展开式。作为我们结果的一个特例,我们得到了二元极随机向量的精确渐近行为。我们应用我们的结果研究了二元尺度混合分布的渐近独立性和条件超额的渐近行为。

英文摘要:

Let (RU_1, R U_2) be a given bivariate scale mixture random vector, with R>0 being independent of the bivariate random vector (U_1,U_2). In this paper we derive exact asymptotic expansions of the tail probability P{RU_1> x, RU_2> ax}, a \in (0,1] as x tends infintiy assuming that R has distribution function in the Gumbel max-domain of attraction and (U_1,U_2) has a specific tail behaviour around some absorbing point. As a special case of our results we retrieve the exact asymptotic behaviour of bivariate polar random vectors. We apply our results to investigate the asymptotic independence and the asymptotic behaviour of conditional excess for bivariate scale mixture distributions.

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