ABSTRACT
The data we have to work with is not always obtained by direct observation of cohorts. In the next lecture we will discuss somewhat “imperfect” data, that have a more complicated structure. However, in this lecture we will continue to consider a cohort, i.e. continue to consider T1, . . . ,Tn as independent and identically distributed random variables. As always, denote by F the common distribution function of each Ti. Suppose F has density f , and let µ be the rate of mortality (see (1.13)),
µ(x) = f (x)
1−F(x) .
