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Re: st: dirifit
Viktor Slavtchev <firstname.lastname@example.org>
Re: st: dirifit
Wed, 05 Mar 2008 09:45:05 +0100
- Maarten, thank you very much!
I am also about to finish my PhD. I need three more months. I know how it feels.
Maarten buis wrote:
--- Viktor Slavtchev <email@example.com> wrote:
My dependent variable are proportions in five categories which add
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
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.
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 L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
1081 HV Amsterdam
Buitenveldertselaan 3 (Metropolitan), room Z434
+31 20 5986715
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