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Re: st: string variable


From   "Fabian Schönenberger" <sch.f@gmx.ch>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: string variable
Date   Fri, 03 Aug 2012 10:36:21 +0200

Many thanks Nick. 

-encode- worked fine.

Fabian

-------- Original-Nachricht --------
> Datum: Fri, 3 Aug 2012 08:41:12 +0100
> Von: Nick Cox <njcoxstata@gmail.com>
> An: "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
> Betreff: Re: st: string variable

> My guess is that -wtmean()- is written for some version of Stata --  
> say around Stata 5 -- sufficiently old that by an old misfeature it  
> behaves as if the quotation marks were stripped on parsing. I wrote an  
> FAQ on this about 10 or 12 years ago, but can't find it using only a  
> phone.
> 
> Your solutions include
> 
>   to rewrite -wtmean()-
> 
> to -encode- your string variable and work with the corresponding  
> numeric variable (this is probably closest to what else you are doing)
> 
> to write a loop using -summarize- and -replace-
> 
> to use -statsby-.
> 
> Nick
> 
> On 3 Aug 2012, at 06:14, "Fabian Schönenberger" <sch.f@gmx.ch> wrote:
> 
> > Dear Statalist
> >
> > I try the following commands:
> >
> > . levelsof SIZEBM,local(levels)
> > `"BH"' `"BL"' `"BM"' `"SH"' `"SL"' `"SM"'
> >
> > foreach l of local levels {
> >  egen meanwreturn_`l'=wtmean(trt1m) if SIZEBM=="`l'",weight(size) by 
> > (datemt)
> >  }
> > BH not found
> > r(111);
> >
> > wtmean is from SSC.
> >
> > SIZEBM is a string variable, generated with the command
> >
> > egen SIZEBM=concat(SIZE BM)
> >
> > It seems the problem is not the foreach, but the term -  
> > SIZEBM=="`l'" -
> >
> > Any ideas the solve the problem highly appreciated.
> >
> >
> 
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