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Answers and rating deltas for

How can I most efficiently set 0 vals to NA in a subset of columns?

Author Votes Δ
Andrie 8 +0.28
asachet 0 -1.02
pauljeba 0 -0.69
The Unfun Cat 0 -0.55
Last visited: Aug 26, 2016, 2:34:25 PM