[R] lme, spline

Farhad Shokoohi statfar at gmail.com
Tue Jun 15 09:47:59 CEST 2010

Dear All,
I have a problem running this program on R. Z is a  matrix of spline which is random
> fit<-lme(anc~X,random=pdIdent(~Z))
Error in getGroups.data.frame(dataMix, groups) : 
  Invalid formula for groups
What I have done wrong?

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