This should do it for you:
> x <- read.table(textConnection(" 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
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 0.79
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