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thirdcall
2007 Dec 09
4
adding group totals to a table
I have a table with two columns:
A 1
A 1
A 2
B 2
C 0
I would like to produce a third column that contains the counts of each
unique combination of col1 and col2:
A 1 2
A 1 2
A 2 1
B 2 1
C 0 1
How can I do this in R?
Thanks in advance ...
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