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Noah. Population Growth. Detroit: Greenhaven Press
2009. Print.
calculating projections on growth rates would be very difficult
the reason why it has been used in calculating population growth is because of the fact that population grows at an exponential rate with a certain factor from the initial population. Several formulas can be derived for calculating population growth rate depending on whether they are discrete or continuous models
for instance
the following figure show a curve of world growth rate that was calculated from the available data and backward projections of population.