Another accounting equation is the demographic accounting equation. This is the basic equation in the field of demography. Sociologists use the equation to determine the change in population from one year to the next. The equation is Population(t+1)= Population(t)+net migration(t)+Natural increase(t).
Population(t) is the population at the specified time. Net migration(t) is the difference between immigration and emigration at a given time. Lastly, natural increase(t) is the difference between births and deaths at a given point in time.
This equation gives a statistical representation of a human population or subpopulation.