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In R, how can I collapse a string variable in a data frame, by a grouping variable? In other word...
| Author | Votes | Δ |
|---|---|---|
| krlmlr | 1 | +0.34 |
| Sven Hohenstein | 1 | -0.42 |
| akrun | 1 | +0.08 |
Last visited: Apr 28, 2015, 1:07:03 PM