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d_tbl
2009 Dec 03
4
Two-way/Three-way sum.
Hi R Users,
I'm wondering how can I calculate two (or three) way sum of a variable. A
sample data is:
State Month Year Value
NC Jan 1996 1
NC Jan 1996 2
NC Feb 1997 2
NC Feb 1997 3
NC Mar 1998 3
NC Mar 1998 4
NY Jan 1996 4
NY Jan 1996 5
NY Feb 1997 5
NY Feb 1997 6
NY Mar 1998 6
NY Mar 1998 7
I'm trying to sum up "value" column by State*Month and by State*Month*Year.
Also, I