Hi all,
I solved my problem:
The reason for the error was that my initial values were not correctly
chosen.
In the previous code:
nlme.model001epr <- nlme(result ~ A0 * exp(- ( exp(A1) * exp(-Ea /
(0.0083144*TEMP.K)) * exp(eps)) * time),
data = Parameterg,
fixed=list(A0+Ea~1,A1~Process),
random=eps~1,
start=c(93, 92, 34.5,*37,34*),
control=list(msVerbose=TRUE, maxIter = 200),
verbose=TRUE, method="REML",
na.action=na.pass)
I have to use smaller values for the bold numbers: e.g. start=c(93,
92, 34.5,*0.5,0.6*),
Probably because the additional parameters are calculated based on what
should be added.
Best wishes,
Heidi
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