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Bifurcation of attritional and large losses in an additive IBNR environment

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  • Ulrich Riegel

Abstract

In certain segments, IBNR calculations on paid triangles are more stable than on incurred triangles. However, calculations on payments often do not adequately take large losses into account. An IBNR method which separates large and attritional losses and thus allows to use payments for the attritional and incurred amounts for the large losses has been introduced by Riegel (see Riegel, U. (2014). A bifurcation approach for attritional and large losses in chain ladder calculations. Astin Bulletin 44, 127–172). The method corresponds to a stochastic model that is based on Mack’s chain ladder model. In this paper, we analyse a quasi-additive version of this model, i.e. a version which is in essence based on the assumptions of the additive (or incremental loss ratio) method. We describe the corresponding IBNR method and derive formulas for the mean squared error of prediction.

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  • Ulrich Riegel, 2016. "Bifurcation of attritional and large losses in an additive IBNR environment," Scandinavian Actuarial Journal, Taylor & Francis Journals, vol. 2016(7), pages 604-623, August.
    • Handle: RePEc:taf:sactxx:v:2016:y:2016:i:7:p:604-623
    DOI: 10.1080/03461238.2014.991423
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