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2002 Jul 23
3
Aggregate: assembling the "by" part on the fly
Dear R users,
I'm having trouble using aggregate() and would
greatly appreciate your advice. I am using R 1.5.1
on Windows 2000.
I want to call my function in the following way
extract.data(x=dat[, "Age", "Year"])
where extract.data() uses aggregate() to count the number
of cases for each combination of "Age" and "Year".
I've defined