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15
Severity Modelling: Adjusting for
IBNER and Other Factors
Having produced a frequency model in Chapters 13 and 14, we can now explore the lower
‘branch’ of the pricing process (Figure 15.1), which aims at producing a severity model
based on the past loss experience of the portfolio under investigations and possibly other
information from other relevant portfolios of risks.
15.1 Introduction
The rst problem that we need to address is that many of the losses that we may use to
estimate the overall distribution of losses (the ‘severity distribution’) are not nal settled
values but estimates, as they are composed of a paid and an outstandi ...