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AW: st: pweight + aweight, double weights


From   Jochen Späth <jochen.spaeth@iaw.edu>
To   <statalist@hsphsun2.harvard.edu>
Subject   AW: st: pweight + aweight, double weights
Date   Wed, 4 Aug 2010 09:58:22 +0200

Hello Stas,

thank you very much for your advice. I'm aware of the possibility of calculating the aggregate sums of investment for different subpopoluations using the pweight and calculating the aggregate (=aweighted) growth rates from the newly-generated data. I was just wondering whether there were a more "flexible" approach, such as, say multiplicating the two weight variables and use the result in a single -tabstat- or something like that.

Thanks again,
Jochen

> -----Ursprüngliche Nachricht-----
> Von: owner-statalist@hsphsun2.harvard.edu [mailto:owner-
> statalist@hsphsun2.harvard.edu] Im Auftrag von Stas Kolenikov
> Gesendet: Dienstag, 3. August 2010 18:30
> An: statalist@hsphsun2.harvard.edu
> Betreff: Re: st: pweight + aweight, double weights
> 
> You would probably want to
> 
> svyset PSU [pw=your weight], strata(strata)
> svy : total investment, over( year sector )
> nlcom ([investment]_subpop_2 -
> [investment]_subpop_1)/[investment]_subpop_1
> 
> or whatever labels the -total- command is going to give to individual
> coefficients.
> 
> On Tue, Aug 3, 2010 at 8:29 AM, Jochen Späth <jochen.spaeth@iaw.edu>
> wrote:
> > Dear Statalisters,
> >
> > I have a question about weights, especially about "double weights".
> >
> > I have micro-data on firms containing information about their investment
> behaviour (amounts) for several years. I then went on to calculate the
> firms' individual (discrete) growth rates of investment, i.e.
> >
> > rate_t = (inv_t - inv_t-1) / inv_t-1
> >
> > and wish to use these individual growth rates to calculate average
> growth rates for, say, economic sectors. Thereby, I'd like to attach an
> aweight to the -tabstat-, -table- or other suitable command, such that
> firms with higher investments in t-1 contribute a higher share to the
> average growth rate. This is, of course, straightforward in Stata.
> >
> > However, since I have sampled data I need to attach to this operation
> also a pweight to get information for the population instead of the
> sample.
> >
> > Can I calculate the average growth rates from the individual ones or do
> I need to -collapse- or -table, replace- my data? It seems that -svyset-
> could be what I am looking for, but it seems rather complicated. Is there
> a way to avoid the -svyset- command and to go on with simple -tabstat- or
> alike instead?
> >
> > Best,
> > Jochen
> >
> > *
> > *   For searches and help try:
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> >
> 
> 
> 
> --
> Stas Kolenikov, also found at http://stas.kolenikov.name
> Small print: I use this email account for mailing lists only.
> 
> *
> *   For searches and help try:
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> *   http://www.stata.com/support/statalist/faq
> *   http://www.ats.ucla.edu/stat/stata/

*
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