[R-sig-ME] missing data in lme, lmer, PROC MIXED

[M Henry H Stevens]

Hi folks,
I have colleagues who comfortably state that "missing data" are ok in
"mixed models" - because "the program (PROC MIXED) handles missing data
-- I have a hard time imagining what it does.

To those of you who use both R and SAS, I was wondering if you might
share insight into what these do. 

As far as I know, for lme:
'na.action="na.omit" ' or na.exclude, removes the rows with any missing
data.

Thanks ,
Hank





-- 
M Henry H Stevens <HStevens at muohio.edu>