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st: mfx and margeff calculations


From   Martin Watts <Martin.Watts@newcastle.edu.au>
To   statalist@hsphsun2.harvard.edu
Subject   st: mfx and margeff calculations
Date   Sat, 29 Mar 2008 10:25:28 +1100

Herewith possibly a silly question. Consider say a probit with a series of variables representing age ranges, with obviously a default age range, not included in the estimation. How is say margeff calculated for say AGE3544? Presumably without any consideration of the fact that an individual can only occupy one age range.
The calculation can be undertaken manually, so that when AGE3544 is set to 1, the others are all zero, but what about when AGE3544 is set to zero? Obviously the default age range kicks in.

Is that the desirable calculation??

Or have I got it all wrong?
Thanks.

Kind regards
Martin Watts

Martin J. Watts 
Associate Professor of Economics 
School of Economics, Politics and Tourism
Faculty of Business and Law 
Research Associate
Centre of Full Employment and Equity (CofFEE) 
The University of Newcastle 
NSW 2308 
Australia 
Martin.Watts@newcastle.edu.au 
http://e1.newcastle.edu.au/coffee/ 
Phone (61)2 4921-5069 (Work) 
Fax (61)2 4921-6919 (Work) 
Mobile: 0 414 966 751


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