Hi,
An example data set is:
group level color
A 1 "blue"
A 1 "Red"
B 1 "blue"
B 2 "Red"
A 2 "Red"
B 2 "Red"
B 2 "blue"
B 2 "blue"
A 2 "blue"
A 2 "Red"
I'd like to compute a summary of counts for each combination of group,
level, color.
An example output would be something like this:
group level color count
A 1 "blue" 1
A 2 "red" 2
B 2 "red" 2
etc..
The tapply function seems to do this for a single variable, but I can
figure out to to do it for combinations of more than one factor. I also
see the ave function, but can't figure out how to apply it to multiple
factors.
Any suggestions?
Thanks
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