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Exact Credibility and Tweedie Models

Published online by Cambridge University Press:  17 April 2015

Esbjörn Ohlsson
Affiliation:
Mathematical Statistics, Department of Mathematics Stockholm University, SE-106 91 Stockholm, Sweden, E-mail: [email protected]
Björn Johansson
Affiliation:
Länsförsäkringar Alliance, SE-106 50 Stockholm, Sweden, E-mail: [email protected]
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Abstract

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Kaas, Dannenburg & Goovaerts (1997) generalized Jewell’s theorem on exact credibility, from the classical Bühlmann model to the (weighted) Bühlmann-Straub model. We extend this result further to the “Bühlmann-Straub model with a priori differences” (Bühlmann & Gisler, 2005). It turns out that exact credibility holds for a class of Tweedie models, including the Poisson, gamma and compound Poisson distribution – the most important distributions for insurance applications of generalized linear models (GLMs). Our results can also be viewed as an alternative to the HGLM approach for combining credibility and GLMs, see Nelder and Verrall (1997).

Type
Articles
Copyright
Copyright © ASTIN Bulletin 2006

References

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