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Re: st: Marginal effect after -clogit- and -xtlogit-


From   "Supnithadnaporn, Anupit" <gtg065t@mail.gatech.edu>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Marginal effect after -clogit- and -xtlogit-
Date   Sat, 7 Feb 2009 12:00:24 -0500 (EST)

Yes, this helps! Thanks Maarten and Steven.

Anupit

----- "Steven Samuels" <sjhsamuels@earthlink.net> wrote:

> Maarten is correct: -predict(pu0)- gives the predicted probability  
> when the intercept is zero.  However, zero may not be a plausible  
> value.  For example: consider an unconditional model Y= logit(P) = a 
> 
> + ln(2)X, corresponding to OR = 2.0, for a one-unit increase in X.   
> If the likely range of probabilities is 0.01 to 0.30, the  
> corresponding range of Y is about -4.60 to -0.85.  If X > -1, then a 
> 
> = 0 is not possible.
> 
> -Steve
> On Feb 6, 2009, at 3:01 PM, Maarten buis wrote:
> 
> >
> > --- On Fri, 6/2/09, Supnithadnaporn, Anupit wrote:
> >> I analyze the data using both -clogit- and -xtlogit fe-
> >> commands. I would like to get the marginal effect of each
> >> independent variables in the model. However, -mfx- command
> >> does not work after both -clogit- and -xtlogit fe-, giving
> >> the error
> >>
> >> predict() expression  unsuitable for marginal effect
> >> calculation
> >> r(119);
> >>
> >> Would anyone please suggest me how to get the marginal
> >> effect after running -clogit- and -xtlogit fe-?
> >
> > -mfx, predict(pu0)-
> >
> >>
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