On a class of distributions stable under random summation

Details On a class of distributions stable under random summation On a class of distributions stable under random summation

2010-08-18

arxiv.org/abs/1008.3150v1

Mathematics

Probability

12 pages, 1 figure

Scientific paper

We investigate a family of distributions having a property of stability-under-addition, provided that the number $\nu$ of added-up random variables in the random sum is also a random variable. We call the corresponding property a \,$\nu$-stability and investigate the situation with the semigroup generated by the generating function of $\nu$ is commutative. Using results from the theory of iterations of analytic functions, we show that the characteristic function of such a $\nu$-stable distribution can be represented in terms of Chebyshev polynomials, and for the case of $\nu$-normal distribution, the resulting characteristic function corresponds to the hyperbolic secant distribution. We discuss some specific properties of the class and present particular examples.

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