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# Re: st: creating variable from svy: proportion

 From Guy Grossman To statalist@hsphsun2.harvard.edu Subject Re: st: creating variable from svy: proportion Date Mon, 3 May 2010 11:52:07 -0400

```weights were constructed by calculating the inverse of the probability
of being included in the sample (basically 1/(multiplying probability
in each of the three sampling stages)). For which constructions you
believe pweights would be biased? what re-weighting method do you
propose?

Guy

On Mon, May 3, 2010 at 11:43 AM, Steve Samuels <sjsamuels@gmail.com> wrote:
> How were the weights constructed, Guy?   For some constructions, the
> estimates for individual cooperatives could be quite biased, and
> re-weighting might be necessary.
>
> Steve
>
> On Mon, May 3, 2010 at 10:20 AM, Guy Grossman <guygrossman1@gmail.com> wrote:
>> Dear Stata listers,
>>
>> forgive me for posting such a basic question. I am using Stata 10.1 to
>> analyze an original stratified three-stage cluster sample survey in
>> which observation are farmers (individuals) sampled from groups
>> (pocode) themselves sampled from larger farmer cooperatives (dccode).
>> isb17 is a dummy variable measured at the individual level. I am
>> trying to create a variable at the PSUs level (dccode), which is the
>> proportion of farmers in the cooperative that have  isb17==1.  I am
>> reluctant to use the collapse command given the survey design.
>>
>> svyset dccode [pw= pweight], strata (strata) fpc(fpc1) || pocode,
>> fpc(npos) || _n, fpc(popop)
>> svy: proportion isb17, over(dccode)
>>
>> What I am failing to do, is to take the e(b) from ereturn and generate
>> a variable that represents isb17==1 at the dccode level.
>> Help would be highly appreciated.
>>
>> Cheers,
>> Guy
>>
>> *
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>>
>
>
>
> --
> Steven Samuels
> sjsamuels@gmail.com
> 18 Cantine's Island
> Saugerties NY 12477
> USA
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>
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>

--
Guy Grossman | PhD Candidate - Columbia University | Political Science
Department | IGERT International Development and Globalization Fellow
|  (+1917) 664-6946 | gsg2102@columbia.edu  |  skype: gugrossman |
http://www.columbia.edu/~gsg2102/ |

*
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*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/
```