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Answers and rating deltas for

calculating sum of previous 3 rows in R data.table (by grid-square)

Author Votes Δ
David Arenburg 8 +0.84
Roland 3 +0.17
G. Grothendieck 2 -0.52
Maksim Gayduk 2 +0.61
donlelek 0 -2.86
Last visited: Jan 3, 2016, 9:42:40 AM