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Answers and rating deltas for

How do I reduce the dimensions of my data frame in terms of columns by averaging between columns?

Author Votes Δ
Daniel 3 +3.75
Lennyy 2 +0.63
Sven 1 -2.41
Rui Barradas 1 -0.74
Last visited: Sep 4, 2019, 3:46:46 PM