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st: RE: Elasticity


From   "Pierre Alexandre" <pialexan@jhsph.edu>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Elasticity
Date   Wed, 20 Apr 2005 14:47:57 -0400

Reading 'mfx' in the reference book may help.  But, it seems that using
log transformations may be the right way to go.

Pierre  



-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Rita Luk
Sent: Wednesday, April 20, 2005 2:35 PM
To: 'statalist@hsphsun2.harvard.edu'
Subject: st: Elasticity

Hi Statalist,

Please excuse me that this is not exactly a question about Stata, but I
think professionals here can help.

For a regression equation:  X/Y = a + bZ + cK + error where X, Y, Z and
K
are variables. Given estimates of the coefficients b and c, what is the
formula for the marginal effect of Z on X ie. dX/dZ, and the formula for
the
elasticity of X with respect to Z.

I know how to get the elasticity when the Dependent is a variable in
level,
but do not know how when the dependent is a ratio.

Your information on the formula or reference materials are much
appreciated.


Thank you very much for your precious time.

Rita Luk
Research Officer
Ontario Tobacco Research Unit
Toronto, Ontario
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