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st: re: counter variable


From   Kit Baum <baum@bc.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: re: counter variable
Date   Sat, 2 May 2009 10:49:14 -0400

<>	
T suggested

 g newvar = 1 if new_prc==1
 bys Id (schlyr): replace newvar = newvar[_n-1]+1 if newvar !=1

This sounds to me like a generally bad idea. The first statement just changes the new_prc zero values into missing values. The second statement relies upon the fact that missing is a value not equal to 1. Although the logic works, I think Eva's suggested approach is a better way to think about a problem like this (although I deplore her reliance on -set varabbrev on-, which is IMHO a Very Bad Idea).

Kit Baum   |   Boston College Economics & DIW Berlin   |   http://ideas.repec.org/e/pba1.html
An Introduction to Stata Programming | http://www.stata-press.com/books/isp.html
   An Introduction to Modern Econometrics Using Stata  |   http://www.stata-press.com/books/imeus.html



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