Dear Paul
Missed this earlier.
As you point out:
> According to the dictionary, Projection means "an estimate of future
> possibilities based on a current trend", whereas Forecast (the noun)
> means "a prophecy, estimate, or prediction of a future happening or
> condition"
It seems clear that forecasts can be derived from projections, but
that projections do not always lead to forecasts. Since a projection
may not be used as a forecast, the original statement that you gave
is not incorrect. But some forecasts are derived without projections
so neither is a sub-set of the other.
> So when I produce an estimate of the number of primary school pupils I
> think we will have in Hertfordshire in 2010, is it a projection or a
> forecast ?
Here you appear to be using a projection as the basis of a forecast.
Regards
Dave Stewardson
ISRU {Industrial Statistics Research Unit}
MMME {Department of Mechanical, Materials and Manufacturing Engineering}
Stephenson Building
University of Newcastle upon Tyne
Tyne & Wear
England
GB - NE1 7RU
TEL 00 44 191 222 6244
FAX 00 44 191 222 7365
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