Roger:

Doh!  Just realized I had that error in the code -- raw_data is the same as
mydata, so it should be:

mydata <- read.csv("singular.csv")
plot(mydata$predictor,mydata$response)
# A big cloud of points, nothing too weird
summary(mydata)
# No NAs:

#       X            response         predictor
# Min.   :    1   Min.   :    0.0   Min.   : 0.000
# 1st Qu.:12726   1st Qu.:  851.2   1st Qu.: 0.000
# Median :25452   Median : 2737.0   Median : 0.000
# Mean   :25452   Mean   : 3478.0   Mean   : 5.532
# 3rd Qu.:38178   3rd Qu.: 5111.6   3rd Qu.: 5.652
# Max.   :50903   Max.   :26677.8   Max.   :69.342

fit_spl <- rq(response ~ bs(predictor,df=15),tau=1,data=mydata)
# Error in rq.fit.br(x, y, tau = tau, ...) : Singular design matrix

--j



On Fri, Apr 19, 2013 at 8:15 AM, Koenker, Roger W <rkoenker@illinois.edu>wrote:

> Jonathan,
>
> This is not what we call a reproducible example... what is raw_data?  Does
> it have something to do with mydata?
> what is i?
>
> Roger
>
> url:    www.econ.uiuc.edu/~roger            Roger Koenker
> email    rkoenker@uiuc.edu            Department of Economics
> vox:     217-333-4558                University of Illinois
> fax:       217-244-6678                Urbana, IL 61801
>
> On Apr 16, 2013, at 2:58 PM, Greenberg, Jonathan wrote:
>
> > Quantreggers:
> >
> > I'm trying to run rq() on a dataset I posted at:
> >
> https://docs.google.com/file/d/0B8Kij67bij_ASUpfcmJ4LTFEUUk/edit?usp=sharing
> > (it's a 1500kb csv file named "singular.csv") and am getting the
> following error:
> >
> > mydata <- read.csv("singular.csv")
> > fit_spl <- rq(raw_data[,1] ~ bs(raw_data[,i],df=15),tau=1)
> > > Error in rq.fit.br(x, y, tau = tau, ...) : Singular design matrix
> >
> > Any ideas what might be causing this or, more importantly, suggestions
> for how to solve this?  I'm just trying to fit a smoothed hull to the top
> of the data cloud (hence the large df).
> >
> > Thanks!
> >
> > --jonathan
> >
> >
> > --
> > Jonathan A. Greenberg, PhD
> > Assistant Professor
> > Global Environmental Analysis and Remote Sensing (GEARS) Laboratory
> > Department of Geography and Geographic Information Science
> > University of Illinois at Urbana-Champaign
> > 607 South Mathews Avenue, MC 150
> > Urbana, IL 61801
> > Phone: 217-300-1924
> > http://www.geog.illinois.edu/~jgrn/
> > AIM: jgrn307, MSN: jgrn307@hotmail.com, Gchat: jgrn307, Skype: jgrn3007
>
>


-- 
Jonathan A. Greenberg, PhD
Assistant Professor
Global Environmental Analysis and Remote Sensing (GEARS) Laboratory
Department of Geography and Geographic Information Science
University of Illinois at Urbana-Champaign
607 South Mathews Avenue, MC 150
Urbana, IL 61801
Phone: 217-300-1924
http://www.geog.illinois.edu/~jgrn/
AIM: jgrn307, MSN: jgrn307@hotmail.com, Gchat: jgrn307, Skype: jgrn3007

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