# Responder: st: svyset for stratified probability proportional to sizedesign

 From Carlos Avalos 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 -----
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
> *   http://www.stata.com/support/statalist/faq
> *   http://www.ats.ucla.edu/stat/stata/
>
```
```begin:vcard
n:Avalos Franco;Carlos C.
fn:Carlos C. Avalos Franco
version:2.1
email;internet:ccavalos@avantel.net
end:vcard

```