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Responder: st: svyset for stratified probability proportional to sizedesign


From   Carlos Avalos <ccavalos@avantel.net>
To   statalist@hsphsun2.harvard.edu
Subject   Responder: st: svyset for stratified probability proportional to sizedesign
Date   Thu, 11 Aug 2005 11:14:53 -0500

Dear Steve,

I suppose that pps do not need weights under a selfweighting design, 
even though you should coorrect weights if you had no response....
.... I know a researcher that works in INSP too.. so I belive she can 
give you a good advise to create your weights, her name is Hortensia 
Moreno Macías.

Saludos
Carlos Avalos.


----- Original Message -----
De: Steve <drlead@prodigy.net.mx>
Fecha: Jueves, Agosto 11, 2005 1:09 am
Asunto: st: svyset for stratified probability proportional to size 
design

> Dear Stata list folk,
> 
> We run on Stata 9, updated all July 5.
> 
> We have a complex survey design data set with the first stage 
> stratified into two parts.  The primary sampling units (census 
> tracts) have been drawn
> with replacement from each of the two strata with probability 
> proportional to population size (PPS) in each of the strata.
> 
> We have the total population, the population of each stratum, and the
> population of each PSU.  There are two further stages in the sampling
> design, random sampling of 3 blocks within each PSU without 
> replacement and
> random sampling of 2 households within each block without 
> replacement.
> Our difficulty lies in specifying specifying svyset for this design,
> particularly selecting (or not) the pw weights for the first 
> level.  On the
> one hand, we read from texts that the glory of probability 
> proportional to
> population sample is that it doesn't need weights.  On the other 
> hand, we
> see from svyset examples at the UCLA site, that considerable 
> effort has 
> gone
> into calculating the values for the first stage weights, though 
> without access to the text, we are unclear how to apply their example.
> 
> Could any suggest how to at least set up svyset for the first 
> stage of the
> above described design?
> 
> Many thanks,
> Steve Rothenberg
> Instituto Nacional de Salud Pública
> Cuernavaca, México
> 
> 
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n:Avalos Franco;Carlos C.
fn:Carlos C. Avalos Franco
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email;internet:ccavalos@avantel.net
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