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Answers and rating deltas for

I need to give NAs in a column a value based on value in another column

Author Votes Δ
Tonio Liebrand 1 +1.22
sdgfsdh 1 +1.25
s_scolary 1 +1.53
Mika Prouk 0 -4.00
Last visited: Feb 19, 2016, 2:51:26 PM