Displaying 1 result from an estimated 1 matches for "tp3310184p3310184".
2011 Feb 17
3
sampling
...a.frame(id=c(1,1,1,2,2,2,2,3,3,3,4,4), v1=c(1:12), V2=c(12:23))
> x
id v1 V2
1 1 1 12
2 1 2 13
3 1 3 14
4 2 4 15
5 2 5 16
6 2 6 17
7 2 7 18
8 3 8 19
9 3 9 20
10 3 10 21
11 4 11 22
12 4 12 23
--
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