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st: RE:RE: AW: marginal effects after ssm command

From   "Arantza Ugidos" <>
To   <>
Subject   st: RE:RE: AW: marginal effects after ssm command
Date   Mon, 15 Feb 2010 13:26:48 +0100

Thanks Martin for your answer and the link to a previous question about ssm.
We also have that problem with the likelihood ratio test. But coming but to
the marginal effects, what we typed is: The specific  options we use are the

ssm y1  x1-x10, s(y2=z1-z8) q(15) adapt trace noconst robust f(binom)
link(oprobit) sel;

We do not know where the error may be. With other commands mfx works fine.
But after ssm it does not return marginal effects but the estimated
coefficients again. 

Thank you again. 


-----Mensaje original-----
[] En nombre de Martin Weiss
Enviado el: miércoles, 10 de febrero de 2010 14:24
Asunto: st: AW: marginal effects after ssm command


So -ssm- is a user-written command, obtained via - ssc d ssm-. 

It is difficult to comment since the simulated example in the help file ends
in a "r(2000)" error, which others have observed before:

You should provide _exactly_ what you typed and where you suspect an


-----Ursprüngliche Nachricht-----
[] Im Auftrag von Arantza Ugidos
Gesendet: Mittwoch, 10. Februar 2010 11:58
Cc: 'Clara Velasquez Garzon'
Betreff: st:marginal effects after ssm command

Hi statalist, 


We are using ssm command to estimate an ordered model with sample selection.
We want to estimate the marginal effects of our explanatory variables. We
use mfx command after the ssm command but this gives us the same values as
the estimated coefficients.  It seems that mfx is not given us the marginal
effect. Does anybody know which is the appropriate command to get the
marginal effects when using ssm?

Thank you very much,



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