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sergio
2005 Jun 17
1
aggregate?
...t I just want to aggregate two levels (c and d)
to obtain a new level e
I am expecting something like:
x y
1 a 10
2 b 11
3 e 25
4 a 14
5 b 15
6 e 33
How can I make it?
Thanks in advance and best for all
A. Diaz
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