Phase-type approximations perturbed by a heavy-tailed component for the Gerber-Shiu function of risk processes with two-sided jumps
| Autor: | Eleni Vatamidou, Zbigniew Palmowski |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Statistics and Probability
Applied Mathematics 010102 general mathematics Probability (math.PR) Perturbation (astronomy) Poisson distribution 01 natural sciences 010104 statistics & probability symbols.namesake Modeling and Simulation symbols FOS: Mathematics Applied mathematics Phase-type distribution 0101 mathematics Mathematics - Probability Mathematics |
| DOI: | 10.48550/arxiv.2006.07463 |
| Popis: | We consider in this paper a risk reserve process where the claims and gains arrive according to two independent Poisson processes. While the gain sizes are phase-type distributed, we assume instead that the claim sizes are phase-type perturbed by a heavy-tailed component; that is, the claim size distribution is formally chosen to be phase-type with large probability $1-\epsilon$ and heavy-tailed with small probability $\epsilon$. We analyze the seminal Gerber-Shiu function coding the joint distribution of the time to ruin, the surplus immediately before ruin, and the deficit at ruin. We derive its value as an expansion with respect to powers of $\epsilon$ with known coefficients and we construct approximations from the first two terms of the aforementioned series. The main idea is based on the so-called fluid embedding that allows to put the considered risk process into the framework of spectrally negative Markov-additive processes and use its fluctuation theory developed in Ivanovs and Palmowski (2012). |
| Databáze: | OpenAIRE |
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