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2008 Nov 12
0
random parameters in nlme
Dear all,
I am using the nlme package to find the best model using non-linear
mixed effects model.
After the all the other things needed, I did
> M1<- nlme(NShrubs~A*exp(-B*CED),data=DataSg,fixed=list
(A~SITE,B~1), random=B~1,start=list(fixed=c
(1.66,1.66,1.66,1.66,1.66,1.66,1.66,1.66,0.0038)),control=lmc)
and it was ok.
However, the data showed to need random parameters at both the
intercept and the slope.
And I can not understand why do I always get an error message like:
Er...