Research Guides
Demographic methods use data such as annual totals of births and deaths, and an estimate of initial population size, to infer refined demographic statistics—life expectancy, gross and net reproduction ratios, and even population age structures. Demographic methods are also used to provide researchers and policymakers with useful information about the size and structure of human populations and the processes that govern population changes.
Source - ScienceDirect
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Demography fun fact - Monaco has the densest population in the world with 26,105 people per square kilometer.
Source - ONE