Lab 2: Cumulative incidence and Incidence Density

What is the cumulative incidence of the disease for 1996? What is the mid-year size of the population in 1996 (i.e. as of July 1996)? In practice, calculating the total number of people at risk in a population is difficult, so a mid-year tally is used to estimate the total number at risk during the entire time period. ................
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