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Answers and rating deltas for
How I can take mean for different subsets of a specific column in a data.table?
| Author | Votes | Δ |
|---|---|---|
| Cole | 5 | +1.69 |
| jay.sf | 4 | +0.40 |
| alexis_laz | 4 | +0.16 |
| ThomasIsCoding | 3 | -0.50 |
| Alexis | 0 | -4.32 |
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