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Re: st: dhs data in stata number of obs and population size


From   michele savini zangrandi <michele.savini@googlemail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: dhs data in stata number of obs and population size
Date   Wed, 18 May 2011 16:01:45 +0200

Steve,
thank you very much for the help, I now understand.
Michele

On 18/05/2011 15:10, Steven Samuels wrote:
Michele

Your question is not clear to me.  The statement in the 2007 Bangladesh Final Report is:
"The final weights were normalized in order to give the total number of un-weighted cases equal to the total number of weighted cases at national level, for both household weights and individual weights."

This appears to refer to the normalization (I called it "standardization", incorrectly) that was applied to the weights before their distribution.

If you are asking: can you apply a correction to the weights so that you can estimate population *totals*, the answer is "No".  If you want to convert percentages totals, you must multiply them by an external estimate of the total for the population. This, to my mind, is one of the most serious problems with using normalized rates-that they do not provide independent estimates of totals.

Steve
sjsamuels@gmail.com



On May 18, 2011, at 4:43 AM, michele savini zangrandi wrote:

Thank you Steve,
Does that mean that if I want to get population estimates (with large standard errors of course) I have to normalize the weights to the population size as reported on the country final report?
Michele

On 17/05/2011 23:12, Steven Samuels wrote:
According to the DHS Recode Manual (http://www.measuredhs.com/pubs/pdf/DHSG4/Recode1DHS.pdf), the weights are standardized to sum to sample size. You should be very familiar with this manual.


-Steve

Steven J. Samuels
Consulting Statistician
18 Cantine's Island
Saugerties, NY 12477 USA
Voice: 845-246-0774
Fax:   206-202-4783
sjsamuels@gmail.com


On May 17, 2011, at 12:42 PM, Michele Savini Zangrandi wrote:

This is a question to anyone who has some familiarity with the DHS survey.

I am trying to use dhs survey data in stata, but am unsure on how to
parametrize it correctly,

So far, using the household members recode file, I have done the following

pweight: w3
VCE: linearized
Single unit: missing
Strata 1: hv022
SU 1: hv021
FPC 1:<zero>

where w3=hv005/1000000

Under this parametrization, when I issue an "svy: tab" command for any
variable, Stata reports a population size very similar to the number
of observations. This seems a little strange to me. I am doing
something wrong?

I would really appreciate your help.

Regards

Michele
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