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st: margin and conformability error after constrained mlogit

From   Adrian Gonzalez-Gonzalez <>
Subject   st: margin and conformability error after constrained mlogit
Date   Thu, 27 May 2004 08:33:52 -0400

Dear Statalisters

I am constraining the coefficients of some explanatory variables to be zero
in a Multinomial model.  After that, when I use margin I get the following
error (program below):
		conformability error

Margin works fine without the constraint option in mlogit. I want to know if
there is any way to overcome this problem with margin.  I know that mfx
works with the constraint option in mlogit, but it takes a lot of time
(days) in my old computer.  I am using the most updated version of Stata 8
and margin.

Thanks a lot


  cons 1 [1]: Minutes
  cons 2 [2]: Minutes
  cons 3 [3]: Minutes
  cons 4 [1]: Xpec_95
  cons 5 [2]: Xpec_95
  cons 6 [3]: Xpec_95

mlogit ralt Years Lenders_* Xpec_95  Sho* Minutes  Savings , base(0)

margin, count percent

Adrian Gonzalez
Ph.D Candidate
Agricultural, Environmental and Development Economics
The Ohio State University
Phone: (614) 784-8928

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