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st: RES: ratio between oprobit marginal effects
Dear Statalist users:
As I have not received any answer to my question, I thought I could
provide more information and clarify my query (which can be
misunderstood in the original post).
I am trying to adapt a model developed in a 1990 T. Bresnahan and P.
Reiss paper ("entry in monopoly markets") to Brazilian data.
Following their model, I need to perform a ratio between 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(1)" and "dydx1(2)".
Now, what I need to estimate is "dydx1(2)/dydx1(1)" with its standard
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.
Any hint on this matter would be very much appreciated.
Fundacao Getulio Vargas - SP.
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