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st: AW: Using svy with by


From   "Martin Weiss" <martin.weiss1@gmx.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: AW: Using svy with by
Date   Tue, 4 Aug 2009 13:16:48 +0200

<> 

Apart from other problems, you are treating -mean- as if it was a function.
You have to -generate- the mean estimate first, and then do the -replace-
separately...

Note the difference:

*************
sysuse auto, clear
by f: gen mean=mean(pr)
*************

*************
sysuse auto, clear
gen meanpr=.
levelsof for, loc(myfor)

foreach lev in `myfor'{
	su pr if for==`lev', mean
	replace meanpr=`r(mean)' if for==`lev'
}
*************



HTH
Martin


-----Ursprüngliche Nachricht-----
Von: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von
A.Dijkstra@lse.ac.uk
Gesendet: Dienstag, 4. August 2009 12:14
An: statalist@hsphsun2.harvard.edu
Betreff: st: Using svy with by

Hi all,
 
I'm trying to find a way around a problem. The code below results in an
error since svy cannot by combined with by. I cannot think of another way to
get the equivalent result I need, however, since the mean I'm attempting to
calculate must be run using svy.
 
Any ideas?
 
Code:

foreach varname of varlist `PAYMENTVARS' {
generate `varname'PANAVG = 0
  by DUPERSID PURCHRD, sort: svy: replace `varname'PANAVG = mean(`varname')
  by DUPERSID PURCHRD: keep if _n==_N
  drop `varname'
  }
 
 
Error:

svy may not be combined with by
r(190);

 

Regards,

A


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