c - usaid
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c - usaid
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6<br />
2. A BRIEF DESCRIPTION OF THE POPULATION<br />
COUNCIL'S FERTILITY MODEL<br />
The Population Council has formulated a m ltipLicative<br />
model, the central equation of which (relating to<br />
any given paint<br />
of time] is:<br />
TFR = C m xC c xC a xC I xTF . ....... • " • [2.1<br />
where: TFR = total fer ti lity rate<br />
C . = indox of marraige<br />
m<br />
C = index of contraception<br />
c<br />
C = indax of induced abortion<br />
a<br />
C index of postpartum infecundability<br />
TF = total fecundity rota<br />
and all the indiceu can take va tLes between zero and one.<br />
The mathematical formula for the four indices are the<br />
f'ollowing:-<br />
Currently married women in an age-group<br />
C - ---------------------<br />
---- - - - ---------------------. . .. (2.2)<br />
All women in the some age-group<br />
The relevant age-group for the aggregate model is 15-49 whereas<br />
the age-specific version considers the age groups 15-19, 20-24,<br />
and so on up to 45-49.<br />
C = 1 - sue . (2.3]<br />
C<br />
CPR<br />
where s is the astari Lity correction factor, u is --- ,that is<br />
I Do<br />
the contracoptive prevalence rate divided by 100, and a is the<br />
average use-effectiveness of contracptive methods.<br />
The valuos of the overall and age-specific sterility<br />
correction factors, as suggested by the Population Council, are:
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