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st: ratio between oprobit marginal effects

From   "Sergio Goldbaum" <>
To   <>
Subject   st: ratio between oprobit marginal effects
Date   Tue, 21 Mar 2006 17:40:27 -0300

Dear Statalisters:
I am trying to perform a ratio of marginal effects after an ordered probit command.
That is, after
. oprobit y x1 x2 x3
where y = 0,1,2
I asked for the marginal effects
. mfx compute, predict (outcome(1))
. mfx compute, predict (outcome(2)) 
which gave me, say, "dydx1" and "dydx2". 
Now, what I need to know is "dydx2/dydx1" with its standard error.
I guess I need to use "nlcom" command, but I have no clue on how to write this last syntax statement, despite all my tries.
Does anyone have any clue on this matter?

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