Mike Lawrence wrote:
One way:
g= paste(f1,f2,f3,f4)
table(g)
I'd go for
g <- interaction(f1,f2,f3,f4, drop=TRUE)
table(g)
which is essentially the same thing.
On Mon, Apr 13, 2009 at 7:33 AM, Nick Angelou <nikola...@yahoo.com> wrote:
Hi,
I have 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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