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Re: st: RE: using glm for the retransformation problem - basic questions


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: using glm for the retransformation problem - basic questions
Date   Wed, 29 Aug 2007 09:07:00 +0100 (BST)

--- Maarten Buis <M.Buis@fsw.vu.nl> wrote:
> These two models model something slightly different: if you 
> -etransform- a linear regression with a log-transformed dependent
> variable you get for dummy variables the difference in geometric
> means (Newson 2003), while if you look at a dummy variable with 
> a non-transformed dependent variable you get the difference in
> arithmatic means.

I have used slightly confusing terminology: more correct would be to
say that you will get the ratio of geometric means.

-- Maarten


-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands

visiting address:
Buitenveldertselaan 3 (Metropolitan), room Z434

+31 20 5986715

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


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