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Re: bug fix seqlogit now available [was: st: seqlogit: Tree Specification]


From   Dominik Becker <dominik.becker@wiso.uni-koeln.de>
To   statalist@hsphsun2.harvard.edu
Subject   Re: bug fix seqlogit now available [was: st: seqlogit: Tree Specification]
Date   Fri, 19 Mar 2010 17:33:00 +0100

Wow, that was fast! Many thanks for your efforts, Maarten, now it works!

Best,
Dominik



________________________________________________________________________

Dominik Becker, M.A.
University of Cologne
Cologne Graduate School in Management, Economics and Social Sciences
(CGS)
Richard-Strauss-Str. 2
50931 Köln

phone:  +49(0)221/470-1221
mail:     dominik.becker@wiso.uni-koeln.de
web:     www.wiso.uni-koeln.de/cgs


Am Freitag, den 19.03.2010, 16:14 +0000 schrieb Maarten buis:
> --- On Fri, 19/3/10, Dominik Becker wrote:
> > I would like to use the seqlogit package to model educational
> > transitions. 
> <snip>
> > My intention was to model the decision tree in the
> > following way:
> > 
> >     tree (0 : 1 2 3 4 5 , 1 2 : 3 4 5 , 1 : 2 , 3
> > : 4 : 5)
> > 
> > However, Stata reports the error "No path in the tree leads
> > to values 5.
> > r(198);"
> 
> Dominik Becker found a bug in the way -seqlogit- parsed complex 
> decision trees specified in the -tree()- option. This has been 
> fixed and thanks to Kit Baum this bug fix is now available from 
> SSC. To install type in Stata:
> -ssc install seqlogit, replace-.
> 
> Many thanks to both Dominik Becker and Kit Baum.
> 
> -seqlogit- fits a sequential logit model. This model estimates the
> effect of the explanatory variables on the probabilities of
> passing a set of transitions. For example, given a highest
> achieved level of education the researcher studies the effect of
> socio-economic status on the probabilities of passing the
> different transitions between levels of education. The user can
> specify any decision tree as long as each level of the dependent
> variable (e.g. level of education) can be reached through one and
> only one sequence of transitions. 
> 
> If these levels have values (e.g. years of education) than this 
> model also implies an effect of the explanatory variable on the 
> highest achieved level. The program -seqlogitdecomp-, which is 
> part of the -seqlogit- package, displays a graph that decomposes 
> this effect on the highest achieved level into parts that 
> measure the effect on the probabilities of passing the 
> transitions and the importance of each transition. 
> 
> The -seqlogit- package also allows one to study the potential 
> impact of unobserved heterogeneity, by enabling one to estimate
> the effects that would occur in various scenarios regarding 
> unobserved variables.
> 
> -- Maarten
> 
> --------------------------
> Maarten L. Buis
> Institut fuer Soziologie
> Universitaet Tuebingen
> Wilhelmstrasse 36
> 72074 Tuebingen
> Germany
> 
> http://www.maartenbuis.nl
> --------------------------
> 
> 
>       
> 
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