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Re: st: fractional logit convergence problem

From   Maarten buis <>
Subject   Re: st: fractional logit convergence problem
Date   Wed, 18 Mar 2009 10:36:18 +0000 (GMT)

--- On Wed, 18/3/09, Jochen Späth <> wrote:
> I try to fit a fractional logit model with 
> -glm depvar indepvars, family(binomial) link(logit)
> scale(x2)-, which uses Quasi-ML for the estimation. My
> dependent variable is the share of high-qualified employees
> within a firm and my dependent variables include both
> industry and time dummies, firm size, and a dummy variable
> indicating whether the firm is a start-up or an incumbent.
> My problem now is that the command does not converge. What
> can I do? Would it help to try alternative optimization
> routines? Or change the distributional assumption in
> -family()-?

I would start with removing some of your covariates. Given 
your describtion I would not be surprised if there is some
perfect colinearity going on here. 

-- Maarten

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


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