Displaying 1 result from an estimated 1 matches for "tp23020587p23020587".
2009 Apr 13
4
Group by in R
...the following table data:
f1, f2, f3, f4.
I want to compute the counts of unique combinations of f1-f4. In SQL I would
just write:
SELECT COUNT(*) FROM <table> GROUP BY f1, f2, ..,f4.
How to do this in R?
Thanks,
Nick
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