Dear Gabor,
1) The constraints are active, at least from a formal point view.
3) I have tried several times to run betareg.fit on the data, and the
only thing I can obtain is the very strange error:
Error in dimnames(x) <- dn : length of 'dimnames' [2] not equal to
array extent
The error is strange because, because the function dimnames is not
called anywhere.
Regards
Gabor Grothendieck wrote:
Try it anyways -- maybe none of your constraints are active.
On Wed, Mar 17, 2010 at 6:01 AM, Corrado <ct...@york.ac.uk> wrote:
Dear Gabor, dear R users,
I had already read the betareg documentation. As far as I can understand
from the help, it does not allow for constrained regression.
Regards
Gabor Grothendieck wrote:
Check out the betareg package.
On Tue, Mar 16, 2010 at 2:58 PM, Corrado <ct...@york.ac.uk> wrote:
Dear R users,
I have to fit the non linear regression:
y~1-exp(-(k0+k1*p1+k2*p2+ .... +kn*pn))
where ki>=0 for each i in [1 .... n] and pi are on R+.
I am using, at the moment, nls, but I would rather use a Maximum
Likelhood
based algorithm. The error is not necessarily normally distributed.
y is approximately beta distributed, and the volume of data is medium to
large (the y,pi may have ~ 40,000 elements).
I have studied the packages in the task views Optimisation and Robust
Statistical Methods, but I did look like what I was looking for was
there.
Maybe I am wrong.
The nearest thing was nlrob, but even that does not allow for
constraints,
as far as I can understand.
Any suggestion?
Regards
--
Corrado Topi
PhD Researcher
Global Climate Change and Biodiversity
Area 18,Department of Biology
University of York, York, YO10 5YW, UK
Phone: + 44 (0) 1904 328645, E-mail: ct...@york.ac.uk
______________________________________________
R-help@r-project.org mailing list
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PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
--
Corrado Topi
PhD Researcher
Global Climate Change and Biodiversity
Area 18,Department of Biology
University of York, York, YO10 5YW, UK
Phone: + 44 (0) 1904 328645, E-mail: ct...@york.ac.uk
--
Corrado Topi
PhD Researcher
Global Climate Change and Biodiversity
Area 18,Department of Biology
University of York, York, YO10 5YW, UK
Phone: + 44 (0) 1904 328645, E-mail: ct...@york.ac.uk
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
