Re: st: RES: multistage sample survey and coding

[William Buchanan <william@williambuchanan.net>]

Hi Ruwan,

You should take a look at the section of the manual that discusses Finite Population Correction.  There is also a website for the book "Applied Survey Data Analysis" from the folks at U Michigan that has tons of great information and useful Stata examples that can help you out.  The authors of the book are also excellent with getting back to people quickly about questions like this.  But if you can determine the FPC at each of the stages it should prevent Stata from assuming that the subjects were sampled with replacement.

Billy Buchanan

Sent from my iPhone

On Sep 24, 2011, at 8:01, "Henrique Neder" <hdneder@ufu.br> wrote:

> Ruwan
> 
> Perhaps the example 6 on page 147 [SVY] Survey Data Manual Stata version 11
> is a good answer for your question.
> 
> I performed an unreal example with 3 stages:
> 
> sysuse auto
> 
> svyset length, fpc(mpg) vce(linearized) singleunit(missing) || length || _
> 
> Note: stage 2 is sampled with replacement; all further stages will be
> ignored
> 
>      pweight: <none>
>          VCE: linearized
>  Single unit: missing
>     Strata 1: <one>
>         SU 1: length
>        FPC 1: mpg
>     Strata 2: <one>
>         SU 2: length
>        FPC 2: <zero> 
> 
> 
> Henrique
> 
> -----Mensagem original-----
> De: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu] Em nome de r
> Enviada em: sábado, 24 de setembro de 2011 05:43do 
> Para: statalist@hsphsun2.harvard.edu
> Assunto: st: multistage sample survey and coding
> 
> Dear Statalisters,
> 
> I am new to multistage sampling and surveys with Stata and would like
> to get a sense if I am on the right track with my coding.
> 
> I have survey data from a three stage cluster survey that demarcates
> the following stages: District (1), Village (2), Household (3). The
> districts and villages were both selected proportional to population
> sizes.
> 
> Would this be the correct coding for setting the parameters of the
> survey design?
> If so, why is the second sampling unit (village) not included in svy
> description of the sampling stages?
> 
> . svyset district, vce(linearized) singleunit(missing) || village|| _n
> 
> (When entered, this following is returned:)
> 
> Note: stage 1 is sampled with replacement; all further stages will be
> ignored
> 
>      pweight: <none>
>          VCE: linearized
>  Single unit: missing
>     Strata 1: <one>
>         SU 1: district
>        FPC 1: <zero>
> 
> Many thanks in advance for your thoughts.
> 
> 
> Ruwan
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