Nick Angelou 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?
table(f1,f2,f3,f4) will give you the counts.
Other statistics can by computed by group using the by() function.
Duncan Murdoch
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