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Answers and rating deltas for

How can I calculate the slope of multiple subsets of a data frame more efficiently?

Author Votes Δ
Daijiang Li 7 +4.75
user227710 2 +0.54
Gavin Simpson 2 -0.21
jeremycg 1 -3.63
Last visited: Nov 11, 2015, 10:48:17 PM