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6.10. Special Populations
If special populations have been defined during model setup, the user may enter detailed age/sex
counts for all special populations in the specpop workbook.
The special populations workbook, specpop, if created, is used to specify data that will:

be deducted from the population at the start of each year;

not be aged;

not be subject to the assumptions on fertility, mortality and migration during the year;

be added again at the end of the year.
Specpop is set up with one sheet for each special population. Each sheet requires the number of
persons (by age and sex) in each Population Group accounted for by the special population. The
data are input as one row per age/sex/Population Group combination, as follows:
Figure 32: Special populations workbook
The format of the ‘special populations’ data entry is different from other workbooks, because
special populations are often restricted to only some ages and some Population Groups. Only these
ages and Groups need be entered. At the time of running a forecast (see Chapter 7) the specpop
workbook is optional.
POPGROUP v.4