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Answers and rating deltas for

In R, how to sum certain rows of a data frame with certain logic?

Author Votes Δ
seancarmody 2 +3.86
digEmAll 1 -0.32
Aaron left Stack Overflow 1 +0.18
dardisco 0 -2.75
Last visited: Sep 14, 2014, 5:07:29 AM