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From |
"Martin Weiss" <martin.weiss1@gmx.de> |

To |
<statalist@hsphsun2.harvard.edu> |

Subject |
st: AW: AW: RE: AW: Exclude some observations from a sample in a regression |

Date |
Wed, 7 Apr 2010 15:13:46 +0200 |

<> Also note http://www.stata-journal.com/sjpdf.html?articlenum=dm0009 re your last query. You do not want to compare foreign to foreign, which yields true in all cases. The missings there are due entirely to "rep78"... HTH Martin -----Ursprüngliche Nachricht----- Von: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Claude Francoeur Gesendet: Mittwoch, 7. April 2010 14:59 An: statalist@hsphsun2.harvard.edu Betreff: st: AW: RE: AW: Exclude some observations from a sample in a regression Thanks for showing me these different methods. I should have mentioned that I do have missing values in my sample. I'm confused though concerning the right command to use. regress price weight length if foreign returns a regression using 22 observations since there are no missing cases regress price weight length rep78 if foreign returns a regression using 21 observations since there is one missing value under rep78. This seems to be contrary to Nick's comment, but I probably am missing something. regress price weight length rep78 if foreign==foreign returns a regression using all 69 non missing observations including domestic cases. The if command does not seem to be recognised. Thanks for your help! * * 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/ * * 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/

**References**:**st: AW: RE: AW: Exclude some observations from a sample in a regression***From:*Claude Francoeur <claude.francoeur@hec.ca>

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