Dear R members,
I have this data frame of 100 years in the following format
year month day A B C D
where A,B,C and D are item number sold each day. I am trying
1-split the data w.r.t the monthly values for each year
2-then, sum them up
I am pasting here just a part of data to make it more clearer
structure(list(year = c(1961, 1961, 1961, 1961, 1961, 1961, 1961,
1961, 1961, 1961, 1961, 1961), month = c(1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1), day = 1:12, A = 1:12, B = 3:14, C = 6:17, D = 16:27), .Names =
c("year",
"month", "day", "A", "B", "C", "D"), row.names = c(NA, 12L), class =
"data.frame")
I initially tried to use "dcast" command but for no use.
Your kind help is needed.
Thanks in advance
Eliza
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