Abstract
A large deviations type approximation to the probability of ruin within a finite time for the compound Poisson risk process perturbed by diffusion is derived. This approximation is based on the saddlepoint method and generalizes the approximation for the non-perturbed risk process by Barndorff-Nielsen and Schmidli (Scand Actuar J 1995(2):169–186, 1995). An importance sampling approximation to this probability of ruin is also provided. Numerical illustrations assess the accuracy of the saddlepoint approximation using importance sampling as a benchmark. The relative deviations between saddlepoint approximation and importance sampling are very small, even for extremely small probabilities of ruin. The saddlepoint approximation is however substantially faster to compute.
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Gatto, R., Baumgartner, B. Saddlepoint Approximations to the Probability of Ruin in Finite Time for the Compound Poisson Risk Process Perturbed by Diffusion. Methodol Comput Appl Probab 18, 217–235 (2016). https://doi.org/10.1007/s11009-014-9412-9
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DOI: https://doi.org/10.1007/s11009-014-9412-9
Keywords
- Conditional distribution
- cumulant generating function
- Gerber-Shiu function
- Importance sampling
- Laplace transform
- Large deviations techniques
- Monte Carlo simulation
- Relative error