---I wrote:
> A situation where you want proportions to add up to 1
> within an observation occurs when you have for each
> observation multiple proportions, e.g. for each city
> you have the proportions of the city budget spent on
> safety, education, transport, etc. In this case the
> proportions within a city should add up to 1. A model
> that deals with this situation is -dirifit-,see:
> http://home.fsw.vu.nl/m.buis/software/dirifit.html
A couple of months ago I posted a fractional multinomial
logit -fmlogit- on the statalist
http://www.stata.com/statalist/archive/2007-05/msg00449.html
-fmlogit- relates to -dirifit- like fractional logit relates
to beta regression.
Can you tell us a bit more about your problem? What are
the dependent and independent variables? Do you have many
observations with a proportion equal to 0 or 1. Papke and
Wooldridge are overly optimistic about the ability of
dealing with those problems using the fractional
(binomial or multinomial) logit model.
Hope this helps,
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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