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Answers and rating deltas for

In R, when creating a model, is there an equivalent to the by statement in SAS?

Author Votes Δ
Gavin Simpson 3 +0.82
Sam Firke 2 +2.29
Ben Bolker 2 +0.17
Mark 1 -1.22
Neal Fultz 0 -0.92
Last visited: Nov 18, 2015, 9:35:03 PM