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Applied Mathematics Letters 26, 1 (2013) http://dx.doi.org/10.1016/j.aml.2012.04.003
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The density of the ruin time for a renewal-reward process perturbed by a diffusion
Christophette Blanchet-Scalliet 1, Diana Dorobantu 2, Didier Rullière 2
(2013)

Let $X$ be a mixed process, sum of a brownian motion and a renewal-reward process, and $\tau_{x}$ be the first passage time of a fixed level $x<0$ by $X$. We prove that $\tau_x$ has a density and we give a formula for it. Links with ruin theory are presented. Our result may be computed in classical settings (for a Lévy or Sparre Andersen process) and also in a non markovian context with possible positive and negative jumps. Some numerical applications illustrate the interest of this density formula.
1 :  Institut Camille Jordan (ICJ)
CNRS : UMR5208 – Université Claude Bernard - Lyon I – Ecole Centrale de Lyon – Institut National des Sciences Appliquées (INSA) - Lyon
2 :  Laboratoire de Sciences Actuarielle et Financière (SAF)
Université Claude Bernard - Lyon I : EA2429
Mathématiques/Probabilités

Économie et finance quantitative/Gestion des risques
Renewal-reward process – Brownian motion – Jump-diffusion process – Time of ruin.
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