Dear Thomas !
Thank you for you help ! I need and explaination. If I suppress second and
third stage what become the variance du to second and third stage ?
I have try this
>E3stage<-svydesign(ids=~stage1id, weight=~wei ...)
and
>E3stage<-svydesign(ids=~stage1id+stage2id+stage3id, weight=~weights...)
And I get the same results
Sincerly.
----- Message d'origine ----
De : Thomas Lumley <[EMAIL PROTECTED]>
À : justin bem <[EMAIL PROTECTED]>
Cc : R Maillist <r-help@stat.math.ethz.ch>
Envoyé le : Dimanche, 24 Septembre 2006, 10h04mn 16s
Objet : Re: [R] Complex survey analysis help
On Sun, 24 Sep 2006, justin bem wrote:
> Hi dear all,
>
> I have a complex survey data to analyse. I have a stratified survey with three
> stages level. The first stage is a PPS, but all other are SRSWOR. The
> solution
>propose in survey package is to considere PPS as SRS with repetion.
No, the solution proposed is to consider it as PPS with replacement.
> I have try this
>
> E3stage<-svydesign(ids=~stage1id+stage2id+stage3id, fpc=~fpc1+fpc2+fpc3, ...)
>
> This is the value for WOR sampling at all stage. What value should I give to
> >fpc1 to have the same value of variance that in sampling with repetion ? I
> try >fpc1<-rep(0,length(data)) I get a error message.
For sampling with replacement you just omit the fpc and specify the first-stage
id and the sampling weights
E3stage <-svydesign(ids=~stageid1, weights=~weights)
-thomas
Thomas Lumley Assoc. Professor, Biostatistics
[EMAIL PROTECTED] University of Washington, Seattle
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