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st: SV: RE: Making symmetry


From   "Alexander" <alex@markedsfakta.as>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: SV: RE: Making symmetry
Date   Fri, 11 Apr 2003 14:03:00 +0200

Hi,

The 'gen draft...' method works perfectly.

It seems like the first method with 'levels' is only for version 8 of
stata? It get the error message; version 8 not supported...

Thank you very much for your help, Nick!

Best regards,
Alexander Severinsen

-----Opprinnelig melding-----
Fra: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] På vegne av Nick Cox
Sendt: 11. april 2003 11:41
Til: statalist@hsphsun2.harvard.edu
Emne: st: RE: Making symmetry


Alexander
> 
> I have 2 ID-variables:
> 
> Id1	Id2
> 1	1
> 2	3
> 3	5
> 4	.
> 5	.
> 
> And I want the variabels to be symmetric in relation to ID1
> 
> Like this:
> 
> Id1	Id2
> 1	1
> 2	.
> 3	3
> 4	.
> 5	5

This will work if the number of distinct 
levels in -Id2- is modest: 

ssc inst levels 
levels Id2 
replace Id2 = . 
foreach l of local levels { 
	qui replace Id2 = `l' if Id1 == `l' 
} 

Slow but sure with arbitrarily large data sets: 

gen draft = . 
forval i = 1 / `=_N' { 
	qui replace draft = Id2[`i'] if Id1 == Id2[`i'] 
} 
replace Id2 = draft 

Nick 
n.j.cox@durham.ac.uk 
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