[R] lme vs. lmer, how do they differ?

[John Sorkin]

windows Vista
R 2.10.1

What is the difference (or differences) between lme and lmer? Both appear to perform mixed effects regression analyses.
Thanks
John 


John David Sorkin M.D., Ph.D.
Chief, Biostatistics and Informatics
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
(Phone) 410-605-7119
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