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Re: st: simultaneous regression for proportions

From   Maarten buis <>
Subject   Re: st: simultaneous regression for proportions
Date   Tue, 7 Apr 2009 14:26:13 +0000 (GMT)

--- carlo wrote:
> > A quick question: Is there any relationship between
> > the variables? For example, do the proportions add 
> > to for each cross-section unit? 

--- On Tue, 7/4/09, Mike Wazowski wrote:
> they don't 

Then my programs don't apply. These are meant for the 
situation where multiple proportions add up to one.
-fmlogit- exactly implements what Carlo sugested,
and -dirifit- is an alternative approach for the same

> one variable is an "index of participation" that runs
> from 0 to 1, the other is the "intensity of trust" that
> also runs from 0 to 1 so i have only one row of data
> per subject.  i want to run 
> participation <- trust ....
> but at the same time there is obviously a question of 
> trust <- participation ....

The bigger problem here seems to me identification. 
If I remember correctly you would need an explanatory 
variable that influences participation but not trust
_and_ an explanatory variable that influences trust
but not participation. I find it hard to imagine 
what these variables might be. 

-- Maarten

Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen


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