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Answers and rating deltas for

In R, how do I add a cumulative max by group?

Author Votes Δ
johannes 3 +1.63
James 3 +0.63
Jilber Urbina 3 +2.17
Justin 2 -0.36
Patrick Hausmann 1 -3.96
Last visited: Sep 14, 2014, 5:07:29 AM