System Dynamics Modeling with R by Jim Duggan

Author:Jim Duggan
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

First order delays are used to model cohort progression, where the average delay time is 15 years for the first cohort, and 25 years for the other cohorts.

Births are based on a fixed proportion of the total population. The birth and death rates are exogenous, which is a limitation of this initial model.

Fig. 4.7The demographic sector

The model comprises four sequential cohorts (4.23–4.26), where each stock has one inflow and one outflow. Births add to Population Aged 0–14 (P0–14), and the first progression rate fills Population Aged 14–39 (P15–39). A similar structure is used for the remaining stocks Population Aged 40–64 (P40–64) and Population Aged 65+ (P65+). The total population is the sum of these four stocks (4.27).

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