Here is the original data
class
1
1
1
1
1
1
3
3
3
4
4
4
4
And I would like to create a new variable which counts the number in each group.
class count
1 1
1 2
1 3
1 4
1 5
1 6
3 1
3 2
3 3
4 1
4 2
4 3
4 4
I think I may use first. last.variable to get the count.But I still don't know how to write the code...Could you help me?
thank you very much
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