Analytical representation for positive alpha-stable densities

In this paper, we present an analytical approximation to positive a-stable probability distribution functions, which in general do not possess a compact analytical form. Our approximation is based on decomposing a positive a-stable random variable into a product of a Pearson and another positive stable random variable. This decomposition allows one to approximate any positive stable pdf as a mixture of Pearson densities, hence providing an analytical representation. This representation allows one to employ maximum likelihood estimation and Bayesian techniques in the presence of positive a-stable noise or signals. The efficiency of the decomposition is demonstrated by simulation studies.