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st: about qvf

From   Arina Viseth <arina@UDel.Edu>
Subject   st: about qvf
Date   Wed, 31 Mar 2010 12:33:37 -0400 (EDT)

Dear Statalist,

I am using glm to run a fractional logit regression: the command I am using is, glm y x1 x2 x3, family(binominal) link(logit) robust. y is my fractional dependant variable.
I would like to control for the possible endogeneity of one of my regressor, x1, using qvf and instrumental variable t1. However when I type qvf y x1 x2 x3 (t1 x2 x3), I have the message "y not 0/1 for Bernoulli model". 

May I please ask for your help/suggestion on what I am doing wrong here?

Many thanks in advance,


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