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@puterleat
Created November 24, 2015 14:27
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If I have these data:
ID T Y
1 1 33
1 2 32
2 1 21
2 2 26
How do I make this extra column:
ID T Y Y1
1 1 33 33
1 2 32 33
2 1 21 21
2 2 26 21
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