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st: RE: Gen & replace commands


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Gen & replace commands
Date   Fri, 26 Oct 2007 17:52:43 +0100

When you test for equality you must use == not =. 

replace drugcat=drug1 if drug1==1 | drug1==2 | drug1==3
replace drugcat=drug2 if drug2==1 | drug2==2 | drug2==3

This would be even better: 

replace drugcat=drug1 if inlist(drug1, 1, 2, 3)

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

Ziad El-Khatib

Patient was using either "drug1" and "drug2".
I am trying to create new category to put the value of adherence to
the two drugs in one column (drugcat). Drug1 and drug2 have values of
1, 2, 3 or empty.

i tried

gen drugcat=0
replace drugcat=drug1 if drug1=1 | drug1=2 | drug1=3
replace drugcat=drug2 if drug2=1 | drug2=2 | drug2=3

it is giving invalid syntax.

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