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yijiang
2008 Oct 16
3
how to count unique observations by variables
...ot;c" "B" "3"
[4,] "a" "B" "3"
[5,] "b" "A" "2"
[6,] "c" "A" "1"
In this case, the 4th column would become (2, 1, 2, 2, 1, 2).
Could someone tell me how to do this?
regards,
Lijiang
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