[R] Error running lme.

From: John Sorkin <jsorkin_at_grecc.umaryland.edu>
Date: Fri 15 Jul 2005 - 03:05:03 EST


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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