[R] quantile regression: warning message

Roger Koenker
Tue, 13 Oct 2015 19:59:08 -0000

see the output from the quantreg FAQ:

	FAQ()

especially point 2.


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                Urbana, IL 61801

> On Oct 13, 2015, at 2:55 PM, T.Riedle <tr206 at kent.ac.uk> wrote:
>
> Greetings R Community,
> I am trying to run a quantile regression using the quantreg package. My
code looks as follows:
>
RegressionUtilitiesUK<-rq(ReturnUtilities~yield.spread.change+ReturnFTSE,
tau=0.01,data=State_variables_UK_calm)
>
> Unfortunately, the summary() function returns the results but also
following warning message:
> Warning message:
> In rq.fit.br(x, y, tau = tau, ...) : Solution may be nonunique
>
> My question now is if I should worry about the results. Are my results
correct and how can I avoid this message? I do not understand the message.
>
> Thanks a lot for your feedback.
>
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>
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