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RE: st: simple question: generating variables using the if / or command


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: simple question: generating variables using the if / or command
Date   Thu, 27 Apr 2006 15:18:21 +0100

Typing 

help operators 

gives all you need to know on this (and you 
really need to know all of it, too). 

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

Scott Cunningham replied to Gauri Khanna [edited] 

> > 1) I would like to generate a new variable :
> >
> > generate newvariable=var1+var2+var3 if dum1=1 and or dum2=1 and or  
> > dum3=1
> 
> gen newvariable=(var1+var2+var3) if dum1==1 | dum2==1 | dum3==1
> 
> > 2) If instead I did the following....
> >
> > generate newvariable=var1+var2+var3 if dum1=1 & dum2=1 & dum3=1
> >
> > .... I would only capture values for var1, var2 and var3 if 
> ALL the  
> > three dummies simultaneously are 1. is this correct? If so I  do  
> > not want this.

> You want newvariable to equal the sum of three variables if any of  
> the dummy variables = 1, but it looks like you are requiring it to  
> equal 1 if all of the dummies equal 1.  In other words, you 
> are using  
> the ampersand (&) when you should be using the (|) (see above).

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