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Re: st: combining DHS surveys: what weights to use
From
Stas Kolenikov <[email protected]>
To
[email protected]
Subject
Re: st: combining DHS surveys: what weights to use
Date
Tue, 13 Jul 2010 07:05:22 -0500
Weights in each country should sum up to the population of that
country (or total # of women of reproductive age, in case of DHS).
That's relevant if you are computing totals (total # of children
without access to a medical provider, total health expenses, etc.). If
you are computing means, ratios, etc., the relative scaling of weights
does not matter -- provided, of course, that the original weights are
scaled to the right population. If they are, you'll be dividing and
multiplying by the same number in the procedure that Bruno outlined
below.
On Tue, Jul 13, 2010 at 2:24 AM, SCHOUMAKER Bruno
<[email protected]> wrote:
> Do you want to do descriptivee analyses for the pooled data set (16
> countries together) ?
>
> In this case, I suppose you need to give greater weights to larger
> countries. Since all children of all women aged 15-49 are usually included
> in DHS, I would use the population of women aged 15-49 in a country to
> compute new weights. This population can be obtained from World Population
> Prospects online database.
>
> The idea is to compute the sampling rate in each country (sample size of
> women aged 15-49 divided by the population aged 15-49), and to compute the
> country weight as the inverse of the sampling rate. Then multiply the
> orginal individual weights by the country weights.
>
> *** in summary
> Original weight in DHS : v005 (which should preferably be divided by 1 000
> 000)
> Country specific weight :CSW= P1549/n1549 (population aged 15-49 in the
> country / sample size of )
> New weight : NW=v005*CSW
>
> Use pweights in the analyses (weights will be normalized by Stata).
>
>
> Hope this helps
>
> Bruno
>
>
>
> Le 12/07/2010 23:11, Stas Kolenikov a écrit :
>>
>> I am not sure why you would want to do anything at all with your
>> weights. Can you explain what kind of modifications did you have in
>> mind?
>>
>> On Mon, Jul 12, 2010 at 3:42 PM, Ana Gabriela Guerrero Serdan
>> <[email protected]> wrote:
>>
>>>
>>> Dear all,
>>>
>>> I am working with DHS surveys for different countries at one point in
>>> time. I want to do regional analysis based on the surveys that I have
>>> (currently for 16 different countries).
>>>
>>> Does anyone has advice on how I should treat sample weights in this case,
>>> if I want to do simple descriptive statistics on the proportion of children
>>> that are undernourished or attending school?
>>>
>>> thanks,
>>> Gaby
>>>
>>>
>>>
>>> *
>>> * For searches and help try:
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>>>
>>>
>>
>>
>>
>
>
> --
> Bruno SCHOUMAKER
>
> Centre de recherche en démographie et sociétés
> Université catholique de Louvain
> 1-17 PLace Montesquieu
> 1348 Louvain-la-Neuve
> BELGIUM
>
> Tel. +32 10 474136
> Fax. +32 10 472952
>
> [email protected]
> www.uclouvain.be/demo
>
> *
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> * http://www.stata.com/support/statalist/faq
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>
--
Stas Kolenikov, also found at http://stas.kolenikov.name
Small print: I use this email account for mailing lists only.
*
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