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Re: st: -mfx-


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: -mfx-
Date   Sat, 23 Sep 2006 14:16:37 +0100 (BST)

Nishant:
Stata doesn't know that you previously logged a variable. It just sees
a column in your dataset that contains numbers, what they mean or what
you've done to it, Stata does not know. 
HTH,
Maarten

--- Nishant Dass <nishant_dass@yahoo.com> wrote:
> I would like to be able to make a statement like "a 1%
> change in lnx results in so many % change in y", so which
> of the following would be correct?
> 
>     mfx c, var(lnx) dyex
> OR
>     mfx c, var(lnx) dydx
> 
> The cause of confusion is whether Stata takes the logarithm
> of a variable or uses an already-"logged" variable in
> calculating the marginal effects.  (If it simply uses
> already-"logged" variables, then what is the use of options
> other than "dydx"?)


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

visiting adress:
Buitenveldertselaan 3 (Metropolitan), room Z434

+31 20 5986715

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


		
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