Dear John Nash
Thank you very much for your inputs on how to fit a non-linear growth curve
without running into "singular gradient". I wasn't aware of the package
"nlmrt" which seems to provide very helpful functions, indeed. I'll try to
figure out how nlxb() can be applied to my data (I am not sure yet wheter I
can actually apply the same initial parameters for all of my plants) and also
how plotting of the fitted curve works with nlxb(). The easy way of using
predict(fit) did not work in this case.
In addition, I am still wondering if there is in fact no way of controlling the
step factor in SSweibull.
Best regards,
Aline Frank
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