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Phase-type distributions and risk processes with state-dependent premiums

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  • Søren Asmussen
  • Mogens Bladt

Abstract

Consider a risk reserve process with initial reserve u, Poisson arrivals, premium rule p(r) depending on the current reserve r and claim size distribution which is phase-type in the sense of Neuts. It is shown that the ruin probabilities ψ(u) can be expressed as the solution of a finite set of differential equations, and similar results are obtained for the case where the process evolves in a Markovian environment (e.g., a numerical example of a stochastic interest rate is presented). Further, an explicit formula for ψ(u) is presented for the case where p(r) is a two-step function. By duality, the results apply also to the stationary distribution of storage processes with the same input and release rate p(r) at content r.

Suggested Citation

  • Søren Asmussen & Mogens Bladt, 1996. "Phase-type distributions and risk processes with state-dependent premiums," Scandinavian Actuarial Journal, Taylor & Francis Journals, vol. 1996(1), pages 19-36.
    • Handle: RePEc:taf:sactxx:v:1996:y:1996:i:1:p:19-36
    DOI: 10.1080/03461238.1996.10413960
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