
From  "Gauri Khanna" <gwkhanna@hotmail.com> 
To  statalist@hsphsun2.harvard.edu 
Subject  RE: st: simple question: generating variables using the if / or command 
Date  Thu, 27 Apr 2006 16:26:24 +0000 
From: "Nick Cox" <n.j.cox@durham.ac.uk>_________________________________________________________________
ReplyTo: statalist@hsphsun2.harvard.edu
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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