I am trying to fit lme using R 2.1.1 under Windows 2k. 
I am getting the following message noted below. 
Any suggestions that would help me correct my error would be greatly
appreciated.
Thanks,
John
 
> fit1lme<-lme(Velocity~time,data=gate)
Error in getGroups.data.frame(dataMix, groups) : 
        Invalid formula for groups

 
John Sorkin M.D., Ph.D.
Chief, Biostatistics and Informatics
Baltimore VA Medical Center GRECC and
University of Maryland School of Medicine Claude Pepper OAIC
 
University of Maryland School of Medicine
Division of Gerontology
Baltimore VA Medical Center
10 North Greene Street
GRECC (BT/18/GR)
Baltimore, MD 21201-1524
 
410-605-7119 
- NOTE NEW EMAIL ADDRESS:
jsorkin@grecc.umaryland.edu

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