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Exponential population

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Exponential population  (EXPONENTIAL population)


The ratio of total growth in, a given period to the mean population of that period is called the crude rate of increase1. Occasionally this rate is computed with the population at the beginning of the period rather than, with the mean population as a denominator. When population increase over a period of more than one calendar year is studied, the mean annual rate of increase2 may be computed. In computing this rate it is sometimes assumed that the population is growing in accordance with the exponential law of growth during the period; such a population is called an exponential population3. Alternatively the total growth may be divided by the number of years and this average growth related to the mean population of the period. The ratio of natural increase (701-7) to the average population is called the crude rate of natural increase4. The ratio of the crude birth rate (630-1) to the less crude death rate (401-4) is called the vital index5, but this measure is no longer much used.
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