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re:RE: Correction: re: Re: st: Interaction terms


From   Christopher Baum <kit.baum@bc.edu>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   re:RE: Correction: re: Re: st: Interaction terms
Date   Tue, 3 May 2011 14:35:30 -0400

<>	
I hadn't seen the combination of the ## notation with the parenthesis like Kit used here.

Safe to assume that creates all possible 2-way interactions of G2 with each var inside the parentheses... but not the fully factorialized model?  



No, not safe... The ## implies full factorial between what is on the left and what is on the right (but not, as you may mean, interactions of stuff inside the parens). Using auto.dta, try

reg price i.foreign##c.(mpg headroom trunk)

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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