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2001 Sep 12
1
error in nlme
I'm getting an error from nlme that has me stymied. I have a data set
,'mydata', with variables: AChE, Dose, sex, set, and mrid; 'set' and 'mrid'
indicate two levels of nesting, with 'set' nested within 'mrid'. I want to
fit the model:
mod <- nlme(AChE ~ Cexp(Dose, A, B, m), data=mydata, fixed = A+B+M~sex,
random=A+B+m~sex | mrid/set, weights=varPower(fixed=1))
(mydata has over 1000 re...