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RE: st: dirifit


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   stata list <statalist@hsphsun2.harvard.edu>
Subject   RE: st: dirifit
Date   Wed, 5 Mar 2008 17:29:20 +0000 (GMT)

-- Viktor Slavtchev wrote:
> I want to explain the share of time, that individuals spent in five 
> alternatives (y1 - y5). Hence y1+y2+y3+y4+y5=1.
> Therefore I run:
> dirifit y1-y5, mu(x1 x2)
> It works, however, for only 60 cases out of more than 500. In other 
> words, the estimation is done for only 60 cases.
> Indeed, there are exactly 60 individuals which spent their full time
> in only one possibility.

That is weird, it should actually exclude all casses where one category
gets all the time or no time at all. -dirifit- works as expectd if I do
the following:

use http://fmwww.bc.edu/repec/bocode/c/citybudget.dta
dirifit governing - urbanplanning,  ///
        mu( houseval popdens noleft minorityleft )

-- 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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