Hi,
How can I accomplish this in R. Example:
R1 R2
3 101
4 102
3 102
18 102
11 101
I want to find Sum(101) = 14 - i.e SUM(R1) where R2 = 101
Sum(102) = 25 - SUM(R2) where R2 = 102
TIA
Sachin
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