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d414b9a8
2010 Dec 02
5
Help summarizing R data frame
I am trying to aggregate data in column 2 to identifiers in col 1
eg..
take this>
identifier quantity
1 10
1 20
2 30
1 15
2 10
3 20
and make this>
identifier quantity
1 45
2 40
3 20
Thanks in