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Re: st: Reconcile Log Transformed with Untransformed Results


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Reconcile Log Transformed with Untransformed Results
Date   Sun, 14 Feb 2010 04:00:53 -0800 (PST)

--- On Sat, 13/2/10, Erasmo Giambona wrote:
> Assuming I want to use the log specification, can I still
> compute economic significance?
> 
> That is, in the example, could I say that a 1 IQR change in
> X (i.e., 0.85) is approximately associated with a 0.008*
> 0.85=0.0068 change in Y?

No, the problem is that by first transforming the dependent 
variable you are no longer modeling the average in y but the
average in log(y). If you want to study your effects in terms
of the original unit of y you'll have to use -glm- with the
-link(log) option rather than use -regress- with the 
transformed dependent variable.

Hope this helps,
Maarten 

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

http://www.maartenbuis.nl
--------------------------


      

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