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Answers and rating deltas for
How to select the first and last row within a grouping variable in a data frame?
| Author | Votes | Δ |
|---|---|---|
| Matt Dowle | 16 | +4.61 |
| rcs | 12 | -0.33 |
| Mark Miller | 0 | 0.00 |
Last visited: Sep 14, 2014, 5:07:29 AM