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Population Estimates, Projections and Forecasts - Coggle Diagram

- - - - Estimation
      - Projection
      - Forecasting
- - - - Geometric Growth
        
        Models yield estimates larger than linear models
        
        Pt=Po x (1+GR)t
        
        Pt: Population size at a later date, Po: size at an earlier date, GR: Growth Rate, t: amount of time (# of years) between 0 and t
      - Exponential Growth
        
        Attention is focused on vial events: Birth, Death and coming and going of migrants
        
        Pt=Po x e (GR x t)
        
        Pt: Population size at a later date, Po: size at an earlier date, GR: Growth Rate, t: amount of time (# of years) between 0 and t, e: exponential constant (2.71828)
    - - Cohort Survival Method
        
        Methods based on the fundamental equation of Demography apply the fact that the size of the population at a date for which data that is unavailable that can be estimated.