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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 > > * > * For searches and help try: > * http://www.stata.com/help.cgi?search > * http://www.stata.com/support/statalist/faq > * http://www.ats.ucla.edu/stat/stata/ > * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**References**:**st: Two weights at the same time?***From:*Daniel Goya León <goya00@gmail.com>

**Re: st: AW: Two weights at the same time?***From:*Steve Samuels <sjsamuels@gmail.com>

**Re: st: AW: Two weights at the same time?***From:*Steve Samuels <sjsamuels@gmail.com>

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