Re: [Gretl-users] Probit marginal effects

On Wed, 15 May 2013, Riccardo (Jack) Lucchetti wrote: > On Wed, 15 May 2013, Riccardo (Jack) Lucchetti wrote: > >> On Tue, 14 May 2013, Henrique Andrade wrote: >> >>> Dear Gretl Community, >>> >>> I'm trying to replicate the slope calculations that Gretl exhibits on >>> Probit >>> estimation. In most of the time I can replicate exactly the same numbers, >>> but there are some cases that I can not (i.e. the values are different). >> >> You're right, thanks for spotting this. Actually, the issue can be >> replicated via a shorter script: > > There's no bug at all, in fact: the effect you're seeing is due to the fact > that dummy explanatory variables are treated specially: here's a script to > replicate the internal calculations [...] Yes, this is gretl doing the Right Thing. For a dummy regressor x_j the "slope" should be calculated as the effect of x_j changing from 0 to 1; the usual marginal effect calculation does not apply. Allin Cottrell _______________________________________________ Gretl-users mailing list Gretl-users(a)lists.wfu.edu http://lists.wfu.edu/mailman/listinfo/gretl-users