Projection in demography is calculating survivors down cohort lines of those living at a given point in time, calculating births in each successive period, and adding a suitable allowance for migration. Of the various ways of looking at population dynamics, the one most convenient for the present purpose is the matrix approach (Chapter 7). Such calculations were used, before Leslie (1945) expressed them in matrix form, by Cannan (1895), Bowley (1924), and especially Whelpton (1936).
----------------------------------------------Page 272, Applied Mathematical Demography
Here is some intro. materials, implemented in Stata. Even though I have been using Stata for a long time, I have never spent any timing learning Mata, too bad.
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