Cohort-Component Technique

http://en.wikipedia.org/wiki/Population_pyramid

The size and composition of a region's population and the way it will change in the future is very important for local government planning. Deaths, births, and migration are largely independent processes that change by differing amounts at varying times, affecting different segments of the poplation. The age and sex differences in the components of population change are also very important because they can interact with a regions population structure. Cohort-component models can disaggregate a population into form age, sex, and racial groups or cohorts and deal separately with the three components: fertility, mortality and migration.



This method is widely used in the projection of population by planners. The analysis of population by using cohort-component technique can account seprately for the underlying causes of population change and make the population projection for the future more close to the real situation.

Shu Yang