I have tried the method proposed by Dave, and I must say it works very well.
Not to yield starting estimates for an nls-fit, but as an independent method
for calculating E (which is, by the way, the only paramater that I am
actually interested in).
The calculated values for E (Esp[3]) are on aver
Thanks everybody,
This has been quite helpful, the problem remains tricky but at least now
I've got a version of my script that handles all my reactions without error.
The DEoptim solution produced good starting values for a lot of reactions,
but sadly not for all. I now use scaled parameters and
se DO work for, say 99% of the
datasets. I don't know why this is and I don't why my 'good estimates' do
not work. I am desperatly seeking a way of calculating working starting
estimates for my nls function. Can anybody give me a hand?
thanks,
Anto
R version 2.9.2
example dataset
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