Dear all
I am tryiing to fit the following lme with an ARMA correlation structure:
test <- lme(fixed=fev1f~year, random=~1|id2, data=pheno2,
correlation=corARMA(value=0.2, form=~year|id2), na.action=na.omit)
But I get the following error message:
Error in getGroupsFormula.default(correlation, asList = TRUE) :
"Form" argument must be a formula
I have used this same form argument with differerent correlation
structures and it has worked fine. Does anyone know why it won't
recognise ~year | id2 (or even ~ 1 | id2) as a formula?
Any help would be great
Pam
--
Pamela A McCaskie
BSc(Mathematical Sciences)(Hons)
Western Australian Institute for Medical Research
University of Western Australia
SCGH Campus
Ground Floor, B Block
QE-II Medical Centre
Hospital Avenue, Nedlands
Western Australia 6009
AUSTRALIA
Email: [EMAIL PROTECTED]
Phone: +61-8-9346 1612
Mob: 0417 926 607
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