[R] nls error in formula

[Anaid Diaz]

thank you, it worked.

Sylvia
--- Douglas Bates <bates at stat.wisc.edu> wrote:
> Anaid Diaz wrote:
> > Hi,
> > I'm a new R user, with a lot of questions. At the
> > moment I'm stoped on an error traying to fit a
> model:
> > 
> > 
> >>x <- sandeel ## numeric data (2500-60000)
> >>y <- Noss   ## numeric data  (0-1.2)
> >>A <- 0.8
> >>B <- 0.6
> >>C <- 1/40000
> >>nls( y ~ A-B*exp(-C*x))
> > 
> > Error in match.call(definition, call, expand.dots)
> : 
> >         .Primitive... is not a function
> > 
> > I'm not sure if the error is due to the formula
> sytax
> > or something else.
> > I'll appreciate any help
> > 
> > Sylvia
> 
> Use
> 
> nls(y ~ A -B*exp(-C*x), start = c(A = 0.8, B = 0.6,
> C = 1/40000))
> 
> instead or, preferably,
> 
> nls(y ~ SSasymp(x, Asym, R0, lrc))
> 
> and read
> 
> ?SSasymp
> 
> for an interpretation of the estimated parameters.
> 

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