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From |
Austin Nichols <austinnichols@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Using the 2008 American National Election Study with Stata v.11 |

Date |
Thu, 15 Oct 2009 12:19:03 -0400 |

Peter Wielhouwer <peter.wielhouwer@wmich.edu> : You can also use a geographic id as a clustering variable if PSU is unavailable--or even if PSU is available and PSUs are nested within geography and you think there is clustering by geography. . u anes2008_2009panel_dataset, clear . svyset [pw=wgtbase] pweight: wgtbase VCE: linearized Single unit: missing Strata 1: <one> SU 1: <observations> FPC 1: <zero> . svy:ta w10p4, ci (running tabulate on estimation sample) Number of strata = 1 Number of obs = 619 Number of PSUs = 619 Population size = 610.10636 Design df = 618 ------------------------------------------------- w10p4. | Favor or | oppose | raising | taxes on | incomes | over | 200k/yr | proportions lb ub ----------+-------------------------------------- 1, Favor | .381 .3393 .4245 2, Oppos | .0682 .0496 .0931 3, Neith | .5508 .5066 .5943 | Total | 1 ------------------------------------------------- Key: proportions = cell proportions lb = lower 95% confidence bounds for cell proportions ub = upper 95% confidence bounds for cell proportions . egen c=group(stratum cdstate), mi label . svyset c [pw=wgtbase] pweight: wgtbase VCE: linearized Single unit: missing Strata 1: <one> SU 1: c FPC 1: <zero> . svy:ta w10p4, ci (running tabulate on estimation sample) Number of strata = 1 Number of obs = 619 Number of PSUs = 81 Population size = 610.10636 Design df = 80 ------------------------------------------------- w10p4. | Favor or | oppose | raising | taxes on | incomes | over | 200k/yr | proportions lb ub ----------+-------------------------------------- 1, Favor | .381 .3383 .4255 2, Oppos | .0682 .0513 .0903 3, Neith | .5508 .5098 .5912 | Total | 1 ------------------------------------------------- Key: proportions = cell proportions lb = lower 95% confidence bounds for cell proportions ub = upper 95% confidence bounds for cell proportions On Thu, Oct 15, 2009 at 9:22 AM, Nick Winter <nwinter@virginia.edu> wrote: > The ANES weights should be used as pweights. > > In recent studies (eg, the 2004 dataset), ANES supplies a variable that > indicates "strata" and "psus" that can be used for BRR or Taylor-series > approaches to variance estimation. (They don't release the complete > sampling information to prevent possible identification of individual > respondents -- this is discussed, eg, in the introductory materials for the > 2004 study documentation: > http://www.electionstudies.org/studypages/2004prepost/nes04int.txt) > > So until the final,complete release of the 2008 data, you are stuck with > just using the appropriate pweight. > > (As an aside, in my experience, taking proper account of the stratification > and clustering in the ANES datasets has not had dramatic effects on standard > errors. But of course my prior experience doesn't guarantee your future > performance....) > > - NW > > sjsamuels@gmail.com wrote: >> >> It states that "comprehensive instructions will accompany the full >> release of the Panel Study Data." >> >> I'm not familiar with ANES, but neither the paper Bob found nor the >> user guide have anything about weights centered at zero. (The paper >> does recommend that weights be scaled so that they sum to 1.) In >> fact, weights<0 would be rejected by any survey program. >> >> >> -Steve >> >> >> On Thu, Oct 15, 2009 at 6:07 AM, Peter Wielhouwer >> <peter.wielhouwer@wmich.edu> wrote: >>> >>> Subject: Re: st: Using the 2008 American National Election Study with >>> Stata >>> v.11 >>> >>> Thanks, Richard. I've been looking through the SVY manual, but what the >>> ANES >>> dataset provides are individual weighting variables (post estimation >>> weights >>> centered on zero, as described in the paper you pointed me to. I agree >>> that >>> it would be nice for ANES to be more specific about how to use Stata well >>> with the dataset. >>> >>> >>> At 04:20 PM 10/14/2009, Peter Wielhouwer wrote: >>> >>>> Is anyone familiar with using the 2008 NES with Stata? I have two >>>> specific questions: >>>> >>>> 1. Which weight command is most appropriate for the data? Based on the >>>> Stata UG, it seems that the -iweight- syntax is most appropriate, but is >>>> that correct? >>> >>> I am not familiar with the data set, but I would be amazed if >>> iweights were the way to go. My guess is you want pweights. googling >>> around found this recent paper: >>> ftp://ftp.electionstudies.org/ftp/nes/bibliography/documents/nes012427.pdf >>> >>> If you google around some more though, maybe you can find something >>> easier to wade through; it is nice when a data set explicitly tells >>> you how to set the weights in Stata. >>> >>>> 2. In the ANES 2008 user guide, we are advised, "due to the complex >>>> sample design of the ANES, sampling errors and related statistics >>>> (including confidence intervals, p-values, t-tests, and all other tests >>>> of statistical significance) should not be calculated using methods >>>> intended for simple random samples." In light of this, which would be >>>> the appropriate statistics to use in Stata? >>> >>> I think the correct question is not what statistics should I use, but >>> what statistical methods should I use to get the correct >>> statistics. Since you have Stata 11, you should also have the SVY >>> manual available in pdf form. Just click help/ PDF >>> documentation. If bookmarks are open then on the left hand side >>> you'll see the svy manual. After you've gone over the opening >>> explanatory material, the section on svy estimation will highlight >>> the many commands you have available. You'll probably want commands >>> like svy: tabulation, svy: mean, svy: regress, svy: logit, etc. >>> >>> * * 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**:**Re: Re: st: Using the 2008 American National Election Study with Stata v.11***From:*Peter Wielhouwer <peter.wielhouwer@wmich.edu>

**Re: Re: st: Using the 2008 American National Election Study with Stata v.11***From:*sjsamuels@gmail.com

**Re: st: Using the 2008 American National Election Study with Stata v.11***From:*Nick Winter <nwinter@virginia.edu>

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