Dear list,
I have a problem with the cumsum function.
I have a data frame like the following one
variable Year value
EC01 2005 5
EC01 2006 10
AAO1 2005 2
AAO1 2006 4
what I would like to obtain is
variable Year value cumsum
EC01 2005 5 5
EC01 2006 10 15
AAO1 2005 2 2
AAO1 2006 4 6
if I use the by function or the aggregate function the result is a list or
something else, what I want is a data frame as I showed above...
anyone knows how to get it???
THANKS A LOT
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