Every human population, normally, may have a change in its size over a period of time. Each change in the population size may be an increase or decrease in magnitude.

**Measurement of Population Growth**

Every human population, normally, may have a change in its size
over a period of time. Each change in the population size may be an increase or
decrease in magnitude. Sometimes, the population size may remain without any
change. Such a population is known as stable population. The tendency to
increase in the population size may be called as **population growth**.
Every government requires information about the rate of growth of its
population.

If many new born babies in a population are female, the
corresponding population size may increase. If gender of the infant deaths is
female, change in the population size may be downward. Hence, fertility and
mortality rates, individually, do not provide knowledge on population growth.

Quantitative ideas about the growth of a population can be
obtained from several measurements. Among them,

(i) Crude Rate of Natural Increase, and

(ii) Pearl’s Vital Index

may be considered as the basic indicators of population growth.
These two measures can be calculated using the following formulae

** Crude Rate of Natural Increase **=

** Pearl's Vital Index **=

Positive values of Crude Rate of Natural Increase indicate the net
increase in the population. Similarly, negative values of Crude Rate of Natural
Increase indicate the net decrease in the population.

If Pearl’s Vital Index is greater than 100, then it can be
regarded as the population is growing. On the other hand, if this index is less
than 100, it can be regarded as the population is not growing. The above
formula shows that the Vital Index can also provide knowledge on birth-death
ratio of the population.

These two measures are simple and easy to calculate. They indicate
whether the number of births exceeds the number of deaths. However, these two
measures suffer from the limitations of *CBR *and* CDR*. They cannot
be used for comparing two different populations. Also, information* *regarding
whether the population has a tendency to increase or decrease cannot be
obtained from these two measures.

Tags : Vital Statistics , 12th Statistics : Chapter 8 : Vital Statistics and Official Statistics

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12th Statistics : Chapter 8 : Vital Statistics and Official Statistics : Measurement of Population Growth | Vital Statistics

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