Modeling And Forecasting The Age Structure Of Population

The population system is a dynamical system. The trend of a population will affect the development of the society and its economy. The age structure is one of the most important indexes in population research. The forecast of age structure plays an important role in making population policies. A discrete model of population development was applied in this paper. Fertility model, mortality model and immigration model were also established to forecast the fertility, mortality, immigration population and the age structure. Compared with traditional functions, both the composite fertility model which is based on random distribution functions and the segmented mortality model improved the models'accuracy.Historical Chinese population statistics were used to prove the validity of the models referred in this paper. The age structure of Shanghai in 2015 was forecasted and displayed in a tree-like graph. The shape of the population tree reflects the health condition of its age structure. By analyzing the development trend of the age structure, we can find population...