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algorism
2001 Apr 15
2
data manipulation in R
Dear List:
I have a data manipulation problem that I was unable
to solve in R. I did it in SQL, and it may be that
the solution in R is to do it in SQL, but I wondered
if people could imagine a vector-based solution.
Imagine a list A[i] of observers who observe some set
of events B[j]. Each observer i may observe one or
more events, and each event j may have been observed
by one or more