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A Technique for Computing the PDFs and CDFs of Nonnegative Infinitely Divisible Random Variables

Published online by Cambridge University Press:  14 July 2016

Mark S. Veillette*
Affiliation:
Boston University
Murad S. Taqqu*
Affiliation:
Boston University
*
Postal address: Department of Mathematics, Boston University, 111 Cummington Street, Boston, MA 02215, USA.
Postal address: Department of Mathematics, Boston University, 111 Cummington Street, Boston, MA 02215, USA.
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Abstract

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We present a method for computing the probability density function (PDF) and the cumulative distribution function (CDF) of a nonnegative infinitely divisible random variable X. Our method uses the Lévy-Khintchine representation of the Laplace transform EeX = e-ϕ(λ), where ϕ is the Laplace exponent. We apply the Post-Widder method for Laplace transform inversion combined with a sequence convergence accelerator to obtain accurate results. We demonstrate this technique on several examples, including the stable distribution, mixtures thereof, and integrals with respect to nonnegative Lévy processes.

Type
Research Article
Copyright
Copyright © Applied Probability Trust 2011 

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