[R] quantile regression problem

From: <zuzmun_at_natur.cuni.cz>
Date: Sun 11 Dec 2005 - 04:30:09 EST


Dear List members,

I would like to ask for advise on quantile regression in R.

I am trying to perform an analysis of a relationship between species abundance and its habitat requirements -
the habitat requirements are, however, codes - 0,1,2,3... where 0<1<2<3 and the scale is linear - so I would be happy to treat them as continuos

The analysis of the data somehow does not work, I am trying to perform linear quantile regression using rq function and I cannot figure out whether there is a way to analyse the data using quantile regression ( I would really
like to do this since the shape is an envelope) or whether it is not possible.

I tested that if I replace the categories with continuous data of the same range it
works perfectly. In the form I have them ( and I cannot change it) I am getting   errors - mainly about non-positive fis.

Could somebody please let me know whether there was a way to analyse the data?
The data are enclosed and the question is Is there a relationship between abundance and absdeviation? I am interested in the upperlimit so I wanted to analyze the upper 5%.

Thanks a lot for your help

All the best

Zuzana Munzbergova

www.natur.cuni.cz/~zuzmun



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Received on Sun Dec 11 04:42:16 2005

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