Hi,
I am having a question. With multiple observations for each ID, I would like
to keep only two or 3 observations for each ID. Does R have any command to
do this? thank you very much!
A simple example is below, How can I only keep the first 2 observations for
each j?
j x
1 1 0.795373270
2 1 0.326845207
3 1 0.049116967
4 1 0.673830996
5 2 0.411789618
6 2 0.628034020
7 2 0.413997203
8 2 0.704016624
9 3 0.135268136
10 3 0.597653294
11 3 0.682791760
12 3 0.127604737
13 4 0.624627821
14 4 0.558165210
15 4 0.010470284
16 4 0.420216783
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