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Re: st: dirifit


From   "viktor.slavtchev@uni-jena.de" <viktor.slavtchev@uni-jena.de>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: dirifit
Date   Wed, 5 Mar 2008 21:46:45 +0100

I want to explain the share of time that individuals spent on five distinct
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. That is, the
estimation is done for 60 cases.
Could it be that the -float- character of the dependent variable causes that
problem? I am just wondering whether the possibility exists that the sum of y
(=y1+y2+y3+y4+y5) becomes slightly lower or slightly larger than one when the
dependent is -float-.
-dirifit- can be estimated only if the sum is one.
Is there a possibility to transform the variables in the way that 0.2534 is
exactly 0.2534 and not 0.253(3)9 or 0.2534(0)1?
Viktor



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