c - usaid

20
Extensive studies made by Coole, Trussolt anrd otherE hove
shown that age-speci fic values of natu rat forti lity, when
expressed in re lative terms, exhibit a fai rly steady pattern. In
fact, the overa LL steri li ty correct ion factor has brien estimated
from the ag -s peci fic factors by assuming that the Co Le -
Trusse lL patte rr of natu ra L fe rtil i ty is app licab le to daveLoping
count ri e . Of course, we need not stick to this pattern alono and
can try out e variety of patterns. A big advantage is that these
pattern s can be s peci'fied in a exogenous manner. In our opinion,
it would be methodoLogicD Lly p referabLe to use these (exogenous
values of naturc l ferti Li ty [expressed in re lative terms end in
different patte rn s to complete tno package of i npu ts (depleted
due to non-i nc Lus ionr of ASF ' ] In this way, by identi fying an
SLtrnnat iv u to the use of ASF ' as en input in the modal, ifo have
d e onE;t rated not oil, y the val id ity of our criticism but also the
construct ive nature of our app roach and comments.