[R] newbie nls question
s.blomberg1 at uq.edu.au
Wed Jun 11 01:04:56 CEST 2008
On Tue, 2008-06-10 at 16:56 -0600, Ranney, Steven wrote:
> I'm tyring to fit a relatively simple nls model to some data, but keep coming up against the same error (code follows):
> Oto=nls(Otolith ~ Linf*(1-exp(-k(AGE-to))),
> data = ages,
> start = list(Linf=1000, k=0.1, to=0.1),
> trace = TRUE)
Try putting a * in after the k in the formula.
> The error message I keep getting is "Error in eval(expr, envir, enclos) : could not find function "k"". I've used this line of code for other nls models (with different data, parameter estimates, etc.), but have never gotten this error. The data is
> Are the missing values (e.g., no value for Otolith, AGE 9) having an effect? I am using Tinn-R as an editor
> I'm new to R, trying to get away from Rcmdr (though it has been helpful), and still trying to learn the language with the aid of several books on the R. A search of the R Archive did not prove fruitful.
> Thanks in advance,
> Steven H. Ranney
> Graduate Research Assistant (Ph.D)
> USGS Montana Cooperative Fishery Research Unit
> Montana State University
> PO Box 173460
> Bozeman, MT 59717-3460
> phone: (406) 994-6643
> fax: (406) 994-7479
> [[alternative HTML version deleted]]
> R-help at r-project.org mailing list
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
Simon Blomberg, BSc (Hons), PhD, MAppStat.
Lecturer and Consultant Statistician
Faculty of Biological and Chemical Sciences
The University of Queensland
St. Lucia Queensland 4072
Room 320 Goddard Building (8)
T: +61 7 3365 2506
1. I will NOT analyse your data for you.
2. Your deadline is your problem.
The combination of some data and an aching desire for
an answer does not ensure that a reasonable answer can
be extracted from a given body of data. - John Tukey.
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