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Re: st: RE: Taking averages, etc.


From   Richard Williams <Richard.A.Williams.5@nd.edu>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: Taking averages, etc.
Date   Wed, 17 Dec 2003 08:32:52 -0500

At 12:38 PM 12/17/2003 +0000, Allan Reese wrote:

First point is to analyse the logic.  Reforming a problem often speeds up
the execution far more than fancy coding, and leads to insights.  In this
case:
  gen y=5
  replace y=3 if x1==1 & x2==3
  replace y=4 if y==5 & (x3==2 & x4==17)
Actually, the y==5 part would be a nice way of simplifying the coding and avoiding errors in this case. However, suppose instead that you couldn't count on Y equaling 5, e.g. suppose the first statement was more like gen y=x12, and you couldn't count on x12 not equaling a value that would also be assigned via a replace statement. Then, you'd have to use a more complicated syntax like I had before.


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Richard Williams, Associate Professor
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