[R] Quantile Regression Question

roger koenker roger at ysidro.econ.uiuc.edu
Thu Nov 15 02:00:37 CET 2007

Package questions to package maintainers.... please.

"non-positive fis"  is not an error, it is a warning -- if the number  
of negative fis
is large relative to the sample  size then there is some reason to  
doubt the
plausibility of the specification of the model specified by the rq  
formula.  So you
can consider this _warning_ to be a diagnostic.

url:    www.econ.uiuc.edu/~roger                Roger Koenker
email   rkoenker at uiuc.edu                       Department of Economics
vox:    217-333-4558                            University of Illinois
fax:    217-244-6678                            Champaign, IL 61820

On Nov 14, 2007, at 6:43 PM, Arti Mann wrote:

> Hi,
> Could you please explain what is non-positive fis error? I have  
> been trying to use quantile regression (rq) procedure and I keep  
> ending up with this error. I haven't been able to find an  
> explanation for the same.
> Best Regards,
> Arti
> Arti Mann
> Ph.D. Student
> Department of Information Systems
> W.P. Carey School of Business
> Arizona State University
> Email : Arti.Mann at asu.edu
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