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Re: st: R: linear regression question


From   Galina Hayes <galina@uoguelph.ca>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: R: linear regression question
Date   Sun, 15 Mar 2009 12:10:25 -0400 (EDT)

Thanks very much everyone, very helpful.
Galina
----- Original Message -----
From: "Maarten buis" <maartenbuis@yahoo.co.uk>
To: statalist@hsphsun2.harvard.edu
Sent: Sunday, March 15, 2009 11:48:52 AM GMT -05:00 US/Canada Eastern
Subject: Re: st: R: linear regression question


--- On Sun, 15/3/09, Carlo Lazzaro wrote:
> your thread seems to refer to a log-linear model, where
> only the dependent variable (i.e., Y) is log-transformed.
> 
> In a log-linear model, a unit-change in the independent
> variable X (i.e., DeltaX=1)is associated with a 100*Beta% 
> change in Y.

This is one possible way of interpreting such a model. An 
alternative way is discussed in: Roger Newson (2003) "Stata
Tip 1: The eform() option with regress" The Stata Journal,
3(4): 445. 
http://www.stata-journal.com/article.html?article=st0054

Both interpretations are correct, they are just different
ways of looking at the same model.

Hope this helps,
Maarten

-----------------------------------------
Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
Germany

http://home.fsw.vu.nl/m.buis/
-----------------------------------------


      

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