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Small- t Expansion for the Hartman-Watson Distribution
Methodology and Computing in Applied Probability ( IF 1.0 ) Pub Date : 2020-10-09 , DOI: 10.1007/s11009-020-09827-5
Dan Pirjol

The Hartman-Watson distribution with density \(f_{r}(t)=\frac {1}{I_{0}(r)} \theta (r,t)\) with r > 0 is a probability distribution defined on \(t \in \mathbb {R}_{+}\), which appears in several problems of applied probability. The density of this distribution is given by an integral θ(r, t) which is difficult to evaluate numerically for small t → 0. Using saddle point methods, we obtain the first two terms of the t → 0 expansion of θ(ρ/t, t) at fixed ρ > 0.



中文翻译:

Hartman-Watson分布的小规模扩张

与密度的哈特曼沃森分布\(F_ {R}(T)= \压裂{1} {I_ {0}(R)} \ THETA(R,T)\)[R > 0是定义的一个概率分布\(t \ in \ mathbb {R} _ {+} \),这出现在应用概率的几个问题中。该分布的密度由一个积分θrt)给出,对于小t →0很难进行数值评估。使用鞍点方法,我们获得θρ /)的t →0展开的前两项。tt)固定ρ > 0。

更新日期:2020-10-11
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