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1232621
2010 Nov 29
3
data.frame and formula classes of aggregate
Hi - I apologize for the 2nd post, but I think my question from a few weeks
ago may have been overlooked on a Friday afternoon.
I might be missing something very obvious, but is it widely known that the
aggregate function handles missing values differently depending if a data
frame or a formula is the first argument ? For example,
(d<- data.frame(sex=rep(0:1,each=3),