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Re: st: AW: AW: Creating a variable taking the value of elasticity


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: AW: AW: Creating a variable taking the value of elasticity
Date   Tue, 8 Sep 2009 14:50:44 +0000 (GMT)

--- On Tue, 8/9/09, Dorothy Bridges wrote:
> I still don't see, then, how mfx, eyex gives me a value different
> than the coefficient on lnx in -regress lny lnx-.

In your linear regression model of y on x you assume changing 
elasticities, and -mfx- gives you the elasticity within that 
model for someone with average values of x. In your regression 
model of lny on lnx you assume constant elasticities. 

-- Maarten

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

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




      

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