Bookmark and Share

Notice: On April 23, 2014, Statalist moved from an email list to a forum, based at statalist.org.


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

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


From   "Martin Weiss" <[email protected]>
To   <[email protected]>
Subject   st: AW: AW: RE: AW: Exclude some observations from a sample in a regression
Date   Wed, 7 Apr 2010 15:09:24 +0200

<> 


Do not confuse the mechanism of the -if- qualifier, which Nick told you
about, with the behavior of -regress- which throws out the observations with
missings in -rep78-. -if- does behave the way Nick said...



HTH
Martin


-----Ursprüngliche Nachricht-----
Von: [email protected]
[mailto:[email protected]] Im Auftrag von Claude
Francoeur
Gesendet: Mittwoch, 7. April 2010 14:59
An: [email protected]
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/


© Copyright 1996–2018 StataCorp LLC   |   Terms of use   |   Privacy   |   Contact us   |   Site index