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st: RE: Weights vs subscripts


From   "Alex Ogan" <aogan@ArrowstreetCapital.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Weights vs subscripts
Date   Tue, 3 Oct 2006 16:23:31 -0400

Somebody more knowledgeable will probably explain exactly why you can't
use subscripts on the left side like that.

But I can suggest a workaround:

replace y=y[`i'-1] +z[`i'] if _n==`i'
 
-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Fan, Shihe
Sent: Tuesday, October 03, 2006 3:57 PM
To: statalist@hsphsun2.harvard.edu
Subject: st: Weights vs subscripts

Hi,

Could any one explain to me why it is OK to write the code in the
following way


gen y=0

foreach i of varlist x {
replace y=y[`i'-1]+ z[`i'] 
}


but not OK in this way


replace y[`i']=y[`i'-1] +z[`i']


the program always treat the [`i'] on the left side as weights, instead
of subscripts


Thank you,



Shihe Fan
Epidemiologist
Office of the MOH
Public Health Division
Suite 300, 10216 - 124 Street
Edmonton AB T5N 4A3		
Phone:(780) 413-7742
Fax: 	(780) 413-7950		
shihefan@cha.ab.ca

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