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How do I manipulate a data.frame to arrive at this desired result? Lag somehow?
| Author | Votes | Δ |
|---|---|---|
| Maurits Evers | 2 | +0.10 |
| Paul | 2 | +2.71 |
| BuJay | 0 | -3.48 |
Last visited: Sep 4, 2019, 3:46:46 PM