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 <[email protected]>
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
>
>
> *
> * For searches and help try:
> * http://www.stata.com/support/faqs/res/findit.html
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>
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n:Avalos Franco;Carlos C.
fn:Carlos C. Avalos Franco
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email;internet:[email protected]
end:vcard
