# Calculating independent rates when the assumption is neither UDD nor CFM

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This question pertains to the following past test question.

4. Consider a three-decrement model of which it may be assumed that decrements 1 and 2 are distributed uniformly in their respective single-decrement tables, but that decrement 3 is concentrated at the end of the year of age.

How do we work with the 3rd decrement? We obviously wouldn't use our formulae as normal. Or would we?

I am struggling to get to an intuitive method of working out the dependent rates given that only two of the independent rates are uniformly distributed.