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arXiv 1503.05290math.PR
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截尾Lévy过程对截尾稳定随机变量序列在$0$的收敛性

Convergence of Trimmed Lévy Processes to Trimmed Stable Random Variables at $0$

Yuguang Fan

摘要:

令$^{(r,s)}X_t$为Lévy过程$X_t$,直到$t$被删除时,$r$跳数最大,$s$跳数最小;令$^{(r)}\tilde X_t$为$X_t$,直到$t$被删除时,$r$模跳数最大。我们表明,$({}^{(r,s)}X_t - a_t)/b_t$或$({}^{(r)}\tilde X_t - a_t)/b_t$收敛到一个适当的非退化的非正态极限分布$t \downarrow 0$当且仅当$(X_t-a_t)/b_t $作为$t \downarrow 0$收敛到一个$α$稳定的随机变量,与$ 0 <α<2 $,其中$a_t$和$b_t>0$是在$t$的非随机函数。与\cite{fan2014an}中处理的渐近正态性情况一起,这完成了$0$中修剪Lévy过程的吸引域问题。

英文摘要:

Let $^{(r,s)}X_t$ be the Lévy process $X_t$ with the $r$ largest jumps and $s$ smallest jumps up till time $t$ deleted and let $^{(r)}\tilde X_t$ be $X_t$ with the $r$ largest jumps in modulus up till time $t$ deleted. We show that $({}^{(r,s)}X_t - a_t)/b_t$ or $({}^{(r)}\tilde X_t - a_t)/b_t$ converges to a proper nondegenerate nonnormal limit distribution as $t \downarrow 0$ if and only if $(X_t-a_t)/b_t $ converges as $t \downarrow 0$ to an $α$-stable random variable, with $ 0 <α<2 $, where $a_t$ and $b_t>0$ are non stochastic functions in $t$. Together with the asymptotic normality case treated in \cite{fan2014an}, this completes the domain of attraction problem for trimmed Lévy processes at $0$.

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