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Least square method of population projection
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Least square method of population projection

This method is applicable when time-series data is available. It is a simple method commonly used to make future projections on the basis of the past
trend. It is common to fit a straight line to the past observations.

y= a+bx

a= ƩY / N
b= Ʃxy /x2
y= last five year decades population x= -2,-1,0,1,2
N= 5 (for five year population data)
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