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In R, how do I count the occurrences of a factor in several columns and group by one column?
| Author | Votes | Δ |
|---|---|---|
| A5C1D2H2I1M1N2O1R2T1 | 4 | +0.12 |
| Arun | 4 | -0.12 |
Last visited: Sep 14, 2014, 5:07:29 AM