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st: Re: interpretation of mfx


From   Kit Baum <baum@bc.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: Re: interpretation of mfx
Date   Fri, 20 Jun 2008 09:42:48 -0400

< >
With a caveat: if the right-hand variable is an indicator, or dummy variable, mfx will by default give you the effect of changing 0 to 1, and indicate same on the output. This is not an infinitesimal change in the variable, as that makes no sense for an indicator variable.

Kit Baum, Boston College Economics and DIW Berlin
http://ideas.repec.org/e/pba1.html
An Introduction to Modern Econometrics Using Stata:
http://www.stata-press.com/books/imeus.html


On Jun 20, 2008, at 02:33 , Maarten wrote:


- -mfx- will give you the first derivative, that is, the slope at a
choses value of x, while -margeff- will compare two points on the curve
one unit apart around that value. So -margeff- will give a discrete
approximation of the derivative.
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