Message-ID: <20050418142634.6433.qmail@web51901.mail.yahoo.com>
Date: 2005-04-18T14:26:34Z
From: Anaid Diaz
Subject: nls error in formula
In-Reply-To: 6667
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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