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st: re: proper use of if

From   Christopher Baum <>
To   <>
Subject   st: re: proper use of if
Date   Wed, 17 Nov 2010 11:12:44 -0500

Nick said

I agree that -if e(sample)- is a good piece of syntax to know, but otherwise I don't see a practical difference here. 

If the observations couldn't be included, the result will be missing and the consequence is the same.

Well, not quite so. If the dependent variable was missing but the RHS variables were not, -predict- could create a prediction for those observations.  Repeating the if condition would not catch that, but e(sample) would.


Kit Baum   |   Boston College Economics & DIW Berlin   |
                              An Introduction to Stata Programming  |
   An Introduction to Modern Econometrics Using Stata  |

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