Population and fertility by age and sex for 195 countries and …

Population and fertility by age and sex for 195 countries and …
The Lancet
where N (T) is the population at a given time, N (0) is the population at the start of the interval, B (0,T) is livebirths during the interval, D (0,T) is deaths during the interval, and G (0,T) is net migration during the interval. …… University