arXivDaily arXiv每日学术速递 周一至周五更新
arXiv math/0702058math.PRcond-mat.stat-mechphysics.acc-phq-fin.CP
收藏

非稳定Levy过程中的混合物

Mixtures in non stable Levy processes

Nicola Cufaro Petroni

摘要:

我们分析了Levy过程产生的两个相互关联的类的非稳定的,无穷可分分布:方差伽玛和学生的法律。虽然Variance Gamma族在卷积下是封闭的,但Student族不是:这使得它的时间演化更加复杂。我们证明,-至少对于一个特定类型的学生过程建议最近的经验结果,并为整数倍-的过程的分布是其他类型的学生分布的混合物,随机化的一个新的概率分布。混合是这样的,沿着时间的渐近行为的密度函数总是符合的学生定律的生成。我们提出的猜想,这可能是一个普遍的功能的学生过程。最后分析了Levy噪声驱动下的Ornstein-Uhlenbeck过程,并给出了一些仿真结果。

英文摘要:

We analyze the Levy processes produced by means of two interconnected classes of non stable, infinitely divisible distribution: the Variance Gamma and the Student laws. While the Variance Gamma family is closed under convolution, the Student one is not: this makes its time evolution more complicated. We prove that -- at least for one particular type of Student processes suggested by recent empirical results, and for integral times -- the distribution of the process is a mixture of other types of Student distributions, randomized by means of a new probability distribution. The mixture is such that along the time the asymptotic behavior of the probability density functions always coincide with that of the generating Student law. We put forward the conjecture that this can be a general feature of the Student processes. We finally analyze the Ornstein--Uhlenbeck process driven by our Levy noises and show a few simulation of it.

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。

↑