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Answers and rating deltas for
How to sum a variable by group with NA?
| Author | Votes | Δ |
|---|---|---|
| akrun | 3 | +0.40 |
| Øyvind Langsrud | 1 | -3.23 |
Last visited: May 11, 2019, 11:16:05 PM
| Author | Votes | Δ |
|---|---|---|
| akrun | 3 | +0.40 |
| Øyvind Langsrud | 1 | -3.23 |