Demographic Bookkeeping (or Balancing) Equation
Demographic bookkeeping is used in the identification of four main components of population growth during any given time interval.
The demographic bookkeeping equation is as follows:
P2 = P1 + (B - D) + (Mi - Mo)
The four components being studied by this equation are Population Growth (P1, P2), Births (B), Deaths (D), and In (Mi) and Out (Mo) Migration.
Meaning, the population at any time is equal to the earlier population plus the excess of births over deaths in the time, plus the amount of in-migration minus the amount of out-migration.
Read more about this topic: Demographic Analysis
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