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Social Demography
The word demography was used for the first time by A.Guillard a Frenchman in his book Elements de Statistique Humanine. It is a statistical study of population composition, distribution and trends. It is the analysis of population variables which includes stock and flow. The national census is the source of stock variable which is carried out periodically in most of the countries. The flow variables are the components of population change which include birth and death registrations.
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