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...re than 1000: $`2009` product year value relative 1 1 2009 1104 0 $`2010` product year value relative 4 1 2010 1504 0 6 3 2010 1312 0 -- View this message in context: http://r.789695.n4.nabble.com/problem-about-set-operation-and-computation-after-split-tp4632496.html Sent from the R help mailing list archive at Nabble.com.