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st: Re: AW: RE: AW: Exclude some observations from a sample in a regression
From
Kit Baum <[email protected]>
To
[email protected]
Subject
st: Re: AW: RE: AW: Exclude some observations from a sample in a regression
Date
Thu, 8 Apr 2010 08:23:31 -0400
On Apr 8, 2010, at 2:33 AM, Claude wrote:
> if foreign==foreign
This is a meaningless (if harmless) if qualifier, as it will always evaluate to true, whether foreign is 0, 1 or missing. The if "command" is recognized; but you've told it to use all cases for which foreign equals itself, which cannot exclude anything.
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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