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2006 Jun 12
2
select the last row by id group
...002 NA 65
5 003 90 65
6 003 NA 70
Could someone advise me tips about how to select the last row from
each id group of 001, 002, & 003?
In other words, the rows I need are :
id reading math
3 001 88 70
4 002 NA 65
6 003 NA 70
I tried function sebset but could not go very far. Thanks !