Re: st: dirifit

[Viktor Slavtchev <viktor.slavtchev@uni-jena.de>]

- Maarten, thank you very much!
I am also about to finish my PhD. I need three more months. I know how 
it feels.
Good luck
viktor

Maarten buis wrote:

> --- Viktor Slavtchev <viktor.slavtchev@uni-jena.de> wrote:
>   
> > My dependent variable are  proportions in five categories which add
> > to one (y1-y5). I want to test the impact of a set of independent
> > variables (a, b, c), which are common for each y.
> > Additionally, I wan to test the impact of x1, x2, x3, x4, x5 whereat
> > x1 enters only the equation for y1, x2 enters only y2, and so on.
> > I think -dirifit- is the right technique. So I run fist:
> > dirifit y1 - y5, alpha(a b c) alpha1(x1) alpha2(x2) alpha3(x3) 
> > alpha4(x4) alpha5(x5) However, as I am interested in the marginal 
> > effects I have to use the
> >
> > -mu- option (if I've got it correctly).
> > My problem is, however, that with -mu- option I was not able to
> > specify that x1 hat to enter only y1, x2 only y2, ...
> > Any help is greatly appreciated.
> >     
> There are -mu1-, -mu2-, etc options, but they don't work well with 
> -ddirifit- which I assume is the problem you are running in to. You
> could add x1 till x5 to all equation and add constraints that their
> parameters are 0 in all equations where you don't want them. Generally
> speaking the -ddirifit- command (the command that computes the marginal
> effects) is too fragile for my taste (I am one of the authors, so I
> don't consider it bad taste to beat up my own program). It is on my
> todo list to repair that. But, as I have said on some other occations
> on this list, I am in the process of finishing my dissertation, which
> has priority right now.
>
> -- Maarten
>
> -----------------------------------------
> Maarten L. Buis
> Department of Social Research Methodology
> Vrije Universiteit Amsterdam
> Boelelaan 1081
> 1081 HV Amsterdam
> The Netherlands
>
> visiting address:
> Buitenveldertselaan 3 (Metropolitan), room Z434
>
> +31 20 5986715
>
> http://home.fsw.vu.nl/m.buis/
> -----------------------------------------
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