> It's a dynamic longditudinal microsimulation.  [Aren't you glad you
asked?]
> Specifically, it's a big complex computer program that takes the public
access
> 1971 Canadian Census data and using historical rates, advances the
population
> to the current day, and then using the "official" projected
rates from the
> Chief Actuaries, projects the population out into the future, simulating
> things like birth, death, migration, labour force participation,
retirement,
> marriage (and divorce), etc, etc, etc.
>

So were the projections forward from 1971 validated by the most recent
census?

> And, also, my day job. :)

Ahh, the simple description 


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