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Answers and rating deltas for
is there a way in R to subtract two rows within a group by specifying another grouping var?
| Author | Votes | Δ |
|---|---|---|
| akrun | 2 | +0.69 |
| Khaynes | 0 | -1.50 |
| BigFinger | 0 | -1.25 |
| ThomasIsCoding | 0 | -0.34 |
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