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2000 Apr 10
2
Newbie: how to calculate group averagege?
Dear R-List,
I?m new in R, so I hope my question is not to primitive, but I haven?t
found a solution in the R-help. I?ve got a datatframe with 3 factors,
called xf (9 levels), yf (9 levels), zf (3 levels) and one variable
(rt):
> xf yf zf rt
> 1 1 1 67
> 1 1 1 56
> 1 1 1 60
[...]
> 1 1 2 58
> 1 1 2 61
[...]
> 9 1