[R] using nls to fit a curve to data
jpl
s-jlubben1 at math.unl.edu
Fri Sep 5 16:16:48 CEST 2008
Hi,
I am trying to fit a curve to data. My command line is:
model10=nls(offspring~((A*c^k)/gamma(k))*((degdays-alpha)^(k-1))*exp(-c*(degdays-alpha)),
start=list(A=30,k=2,c=.018,alpha=131))
I get the error message:
Error in numericDeriv(form[[3]], names(ind), env) :
Missing value or an infinity produced when evaluating the model
In addition: Warning message:
full precision was not achieved in 'gammafn'
My starting values yield a curve very similar t to other models which I
fitted successfully. So any suggestions? I've tried different starting
values.
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