idvalues <- data.frame (ID = c(1, 1, 2, 2, 3, 4, 4, 4, 5, 5),
Value = c(0.69, 0.31, 0.01, 0.99, 1.00, NA, 0,1, 0.5,
0.5))
aggregate(Value~ID, data=idvalues, max)
ID Value
1 1 0.69
2 2 0.99
3 3 1.00
4 4 1.00
5 5 0.50
--
Best,
GG
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