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IAI Actuarial Core Principles · Risk Modelling and Survival Analysis · Mortality projection

In mortality projection, which of the following best describes a 'cohort effect'?

A cohort effect is a systematic difference in mortality improvement for people born in the same period, which stays with that generation as it ages. It differs from period effects such as epidemics and from selection effects at policy inception.

  1. AMortality differences that arise because lives are selected at policy inception
  2. BSystematic differences in mortality improvement for groups of people born in the same period, which persist as they ageCorrect
  3. CA sudden one-off rise in mortality in a single calendar year caused by an epidemic
  4. DDifferences in mortality between males and females at the same age
  5. Random variation in observed deaths around the expected number

Explanation

A cohort effect is where people born in a given period experience mortality improvement that differs from neighbouring generations, and this pattern follows them through life. Selection is a duration effect, an epidemic is a period effect, and sex differences are a different issue.

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