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


From   Claude Francoeur <claude.francoeur@hec.ca>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   st: AW: RE: AW: Exclude some observations from a sample in a regression
Date   Wed, 07 Apr 2010 08:58:55 -0400

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!















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