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From |
Kit Baum <baum@bc.edu> |

To |
statalist@hsphsun2.harvard.edu |

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 * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

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