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Fourier/Laplace Transforms and Ruin Probabilities

Published online by Cambridge University Press:  29 August 2014

Fátima D.P. Lima ,
Jorge M.A. Garcia  and
Alfredo D. Egídio Dos Reis
Fátima D.P. Lima
Affiliation:
SGF - Sociedade Gestora de Fundos de Pensões, Lisbon, E-mail:flima@sgf.pt.
Jorge M.A. Garcia
Affiliation:
SGF - Sociedade Gestora de Fundos de Pensõe, Lisbon, E-mail:jorgegarcia@sgf.pt.
Alfredo D. Egídio Dos Reis
Affiliation:
Department of Mathematics, Technical University of Lisbon, Rua do Quelhas 6, 1200-781 Lisboa, Portugal, Tel: +351-213925867, Fax: +351-213922781, E-mail:alfredo@iseg.utl.pt.
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Abstract

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In this paper we use Fourier/Laplace transforms to evaluate numerically relevant probabilities in ruin theory as an application to insurance. The transform of a function is split in two: the real and the imaginary parts. We use an inversion formula based on the real part only, to get the original function.

By using an appropriate algorithm to compute integrals and making use of the properties of these transforms we are able to compute numerically important quantities either in classical or non-classical ruin theory. As far as the classical model is concerned the problems considered have been widely studied. In what concerns the non-classical model, in particular models based on more general renewal risk processes, there is still a long way to go. In either case the approach presented is an easy method giving good approximations for reasonable values of the initial surplus.

To show this we compute numerically ruin probabilities in the classical model and in a renewal risk process in which claim inter-arrival times have an Erlang(2) distribution and compare to exact figures where available. We also consider the computation of the probability and severity of ruin in the classical model.

Keywords

Risk theoryRuin theoryFourier transformLaplace transformProbability of ultimate ruinSeverity of ruinErlang(2) risk process
Type
Articles
Information
ASTIN Bulletin: The Journal of the IAA , Volume 32 , Issue 1 , May 2002 , pp. 91 - 105
Copyright
Copyright © International Actuarial Association 2002

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