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Answers and rating deltas for

How to identify an observation exists once in a column without using duplicated() or unique()?

Author Votes Δ
Calum You 2 +1.57
Jilber Urbina 0 -0.84
Benjamin 0 -0.97
dww 0 -0.61
Last visited: Sep 4, 2019, 3:46:46 PM