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)
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
AGE,Otolith,Scale
1,207.1052632,207.1052632
2,329.962963,332.7586207
3,401.9473684,406
4,422,413.1111111
5,452.6785714,458.34375
6,510.75,533
7,477,674
8,643,704
9,,615
10,695.5,
12,615,
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,
SR
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
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