Tuesday, March 21, 2006

st: ratio between oprobit marginal effects

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? Thanks.

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