[R] Singular design matrix in rq

[Roger Koenker]

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 at 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 at hotmail.com, Gchat: jgrn307, Skype: jgrn3007