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R - How to sum a variable by certain levels contained in a list of another variable?
| Author | Votes | Δ |
|---|---|---|
| thelatemail | 0 | -0.42 |
| Sathish | 0 | +0.44 |
| r2evans | 0 | -0.03 |
Last visited: Jun 24, 2017, 4:58:10 PM