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How can I assign the value from one of two POSIXct columns in a data.frame to a new POSIXct column?
| Author | Votes | Δ |
|---|---|---|
| greengrass62 | 1 | +4.17 |
| Hanjo Jo'burg Odendaal | 0 | -4.17 |
Last visited: Aug 26, 2016, 2:34:25 PM