[R] nls and factor
Prof Brian Ripley
ripley at stats.ox.ac.uk
Thu Apr 20 14:07:41 CEST 2006
On Thu, 20 Apr 2006, Manuel Gutierrez wrote:
> Is it possible to include a factor in an nls formula?
Yes. What do you intend by it? If you mean what it would mean for a lm
formula, you need A[a] and starting values for A.
There's an example on p.219 of MASS4.
> I've searched the help pages without any luck so I
> guess it is not feasible.
> I've given it a few attempts without luck getting the
> + not meaningful for factors in:
> Ops.factor(independ^EE, a)
> This is a toy example, my realworld case is much more
> complicated (and can not be solved linearizing an
> using lm)
> Any pointers welcomed
> Many Thanks,
> R-help at stat.math.ethz.ch mailing list
> PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Brian D. Ripley, ripley at stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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