[R] Summing rows by years (each time separately)
Andrew Gaska
crane243 at gmail.com
Mon Jan 9 15:06:35 CET 2012
Thanks for your answer!
There is one thing I could not find in aggregate():
I want to have it a sum for each group of 2008,2009 and 2010. In
aggregate() I can sum all the rows that have a rowname 2008, all the rows
that have a rowname 2009 and all the rows that have a rowname 2010.
But I want to have it summed separately each time a new group starts, so not
like this:
2008 24 20 16
2009 19 12 17
2010 16 19 13
but like this:
2008 15 12 10
2009 9 3 7
2010 10 14 10
2008 9 8 6
2009 10 9 10
2010 6 5 3
--
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