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Re: st: AW: Two weights at the same time?


From   Daniel Goya León <goya00@gmail.com>
To   statalist <statalist@hsphsun2.harvard.edu>
Subject   Re: st: AW: Two weights at the same time?
Date   Tue, 17 Aug 2010 16:19:46 +0100

thank you very much. What you explain is consistent with what I had
managed to understand up to now

But you are right, I can easily make things worse messing around with
weights if I don't know what I'm doing. Thanks for the reference for
weighting

Daniel



On 17 August 2010 15:38, Steve Samuels <sjsamuels@gmail.com> wrote:
> " These weights are for persons. If you are analyzing household
> characteristics or HH summaries of individual responses, none of them
> applies".  Actually a form correction might well apply for HH
> summaries of data on the problem forms.  Nothing will substitute for
> the advice of someone truly knowledgeable about this survey. Creating
> weight corrections without sound understanding is just asking for
> trouble. One way of checking your weights is to reproduce published
> estimates and their standard errors.
>
> Steve
>
>
> On Tue, Aug 17, 2010 at 10:08 AM, Steve Samuels <sjsamuels@gmail.com> wrote:
>> The titles are similar but the problem is not. Daniel, I'm not
>> familiar with the GSS, but I have looked at:
>> http://publicdata.norc.org/webview/velocity?study=http%3A%2F%2Fpublicdata.norc.org%3A80%2Fobj%2FfStudy%2F4697&node=30&mode=documentation&submode=ddi&v=2&doprint=true.
>>
>> The advice below is based on quick reading of that page, and I could
>> well be wrong. I suggest that you contact someone who has analyzed the
>> survey data for these years and ask them to send you the code they
>> used to calculate the weights. In Stata, you should use probability
>> weights ("pweights") and not analytic weights.
>>
>> The study does not provide a base household weight, because all
>> households have the same weight. The FORMWT variable is relevant only
>> to certain forms. For analyzing variables on those forms, you create a
>> "final" weight equal to FINAL_WT= FORMWT x ADULTS; for other forms,
>> FINAL_WT = ADULTS If you are analyzing the ISSP questions on Form 1,
>> you might want to create a weighting factor to adjust for
>> non-response; see the section on the ISSP variable. You might also
>> create post-stratification weights to compensate for the
>> under-sampling of males.
>>
>> These weights are for persons. If you are analyzing household
>> characteristics or HH summaries of individual responses, none of them
>> applies. You would create a household weight equal to 1 for those
>> analyses, but see the section on "Weights for 2004-06 GSS".
>>
>> Good introductions to weighting are in: Groves, Fowler et al., Survey
>> Methodology, 2nd Ed, 2009 (Wiley); in Levy and Lemeshow, Sampling of
>> Populations, Wiley, 2009; and in Sharon Lohr, Sampling, Design and
>> Analysis: Brooks-Cole, 2009.
>>
>> Steve
>>
>> -
>> Steven Samuels
>> sjsamuels@gmail.com
>> 18 Cantine's Island
>> Saugerties NY 12477
>> USA
>> Voice: 845-246-0774
>> Fax:    206-202-4783
>>
>>
>> On Tue, Aug 17, 2010 at 7:13 AM, Martin Weiss <martin.weiss1@gmx.de> wrote:
>>>
>>> <>
>>> Sounds very similar to Jochen`s recent thread at
>>> http://www.stata.com/statalist/archive/2010-08/msg00121.html
>>>
>>> HTH
>>> Martin
>>>
>>> -----Ursprüngliche Nachricht-----
>>> Von: owner-statalist@hsphsun2.harvard.edu
>>> [mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Daniel Goya
>>> León
>>> Gesendet: Dienstag, 17. August 2010 13:05
>>> An: statalist
>>> Betreff: st: Two weights at the same time?
>>>
>>> Hello. I think this question might be more pure statistics than
>>> stata-related, but hopefully you can help me out please.
>>> I'm currently working with the GSS (1985 and 2004), and have an issue
>>> with weights (for simple OLS regressions). The 2004 data includes a
>>> variable that explicitely takes into account two things: subsampling
>>> of a group due to two-stage stratification, and the number of adults
>>> in the household.
>>> My problem is that with the 1985 data I'm working, I also need to
>>> correct for two things: people in household, and a form randomization
>>> mistake from that year. But I have two independent weight variables.
>>> (formwt and adults in 1985 gss). If my understanding is right, I
>>> should use analytical weights for both. Is there any way to use two
>>> weights at the same time? Is it valid at all to simply multiply them?
>>> Am I talking nonsense?
>>> I hope that you can help me out please, thanks in advance
>>>
>>> Daniel
>>>
>>> ps:I'm definitely studying some sampling before going into more
>>> empirical work...
>>> *
>>>
>> -
>>
>
>
>
> --
> Steven Samuels
> sjsamuels@gmail.com
> 18 Cantine's Island
> Saugerties NY 12477
> USA
> Voice: 845-246-0774
> Fax:    206-202-4783
>
> *
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> *   http://www.stata.com/help.cgi?search
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>

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