[R] data.frame and formula classes of aggregate

[David Freedman]

Thanks for the information.  

There was a discussion of different results obtained with the formula and
data.frame methods for a paired t-test -- there are many threads, but one is
at 
http://r.789695.n4.nabble.com/Paired-t-tests-td2325956.html#a2326291

david freedman
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