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Wanted Total Fertility Rate in DHS [message #2448] Thu, 19 June 2014 09:14 Go to previous message
AbdoulM
Messages: 2
Registered: June 2014
Member
Hello!

I am working on fertility using the DHS data from several african countries
The Total Fertility Rate (TFR) values I computed are exactely the same as in the DHS reports
But when computing the Wanted TFR, the values are not matching the ones published in the reports
The method consist in excluding the unwanted births before using the Schoumaker's stata software module (tfr2)

Find below how I made it
Please help me understand where the differences come from
Thanks,

I use the definition of "wantedness" as given in the "Guide to DHS Statistics" (Page 87, Updated Sept. 2006)
Let's remind that:
*b3_ is the date of birth in CMC;
*b5_ is the survival status (1 or 0);
*b7_ is the age at death, mounth imputed;
*v613 is the ideal number of children.

A birth is considered wanted if the number of living children at the time of conception of the child i (NLC_i) is less than the ideal number of children (INC), that is: i is wanted if NLC_i < INC
The time of conception for a child i is: dconcep_i = b3_i - 9

A preceding child (let's say j) is considered living at the time of conception of the child i if:
**C1) j is born before the date of conception of i, That is: b3_j < dconcep_i
**C2) j is living at the time of the survey, That is: b5_j==1
**C3) OR j died at or before the date of conception of i, That is: b3_j + b7_j <= dconcep_i

According to these conditions, I create a dummy variable (G) as:
For every child j preceding i,
*G_ij =1 if {C1 AND (C2 OR C3)}
*If no, G_ij=0

The number of living children at the time of conception of i is computed as NLC_i = Sum(G_ij) over j.
For every i, we can now compare NLC_i with the INC
*If NLC_i < INC, then i is wanted
*If no, i is not wanted

I then recode every b3_i (i=1 to 6) as: recode b3_i (0/21600=0) if NLC_i > INC
This is supposed to exclude all the unwanted births when computing the TFR (with the Schoumaker's tfr2)

I am aware that the missing values in Stata can distort the resluts, so I write the commands accordingly.
Find attached the do-file, it may help understanding the process

Regards,

AbdoulM
University of Geneva
  • Attachment: Wanted_TFR.do
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