arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2012.08380math.PR
收藏

具有负相型跳的Lévy过程的尺度函数

On scale functions for Lévy processes with negative phase-type jumps

Jevgenijs Ivanovs

摘要:

本文给出了一类具有负相型跳的Lévy过程标度函数的一种新的表达式。它是根据一个特定的转移率矩阵,这是明确的,直到一个单一的正数。给出了后者的单调迭代计算方法,并证明了其误差呈指数衰减。我们的数值例子表明,该算法允许采用相位型分布与一百个阶段,这是有问题的,当使用已知的公式的尺度函数的根。扩展到其他分布,如矩阵指数和无限维相型,可以预期。

英文摘要:

We provide a novel expression of the scale function for a Lévy processes with negative phase-type jumps. It is in terms of a certain transition rate matrix which is explicit up to a single positive number. A monotone iterative scheme for the calculation of the latter is presented and it is shown that the error decays exponentially fast. Our numerical examples suggest that this algorithm allows to employ phase-type distributions with a hundred of phases, which is problematic when using the known formula for the scale function in terms of roots. Extensions to other distributions, such as matrix-exponential and infinite-dimensional phase-type, can be anticipated.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑