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Answers and rating deltas for
Reduce data.table by group with with different actions depending on column class?
| Author | Votes | Δ |
|---|---|---|
| A5C1D2H2I1M1N2O1R2T1 | 4 | +2.12 |
| Roland | 3 | -1.12 |
Last visited: Sep 14, 2014, 5:07:29 AM