StackRating
An Elo-based rating system for Stack Overflow
Answers and rating deltas for
In R, how can I grab the penultimate row from a data frame for each ID when IDs are non-unique?
| Author | Votes | Δ |
|---|---|---|
| talat | 1 | +4.62 |
| IRTFM | 0 | +0.01 |
| Ben Bolker | 0 | -0.59 |
Last visited: Sep 14, 2014, 5:07:29 AM