StackRating
An Elo-based rating system for Stack Overflow
Answers and rating deltas for
Take unique values of a column and add each in unique column in same row as `by` in data.table
| Author | Votes | Δ |
|---|---|---|
| chinsoon12 | 1 | +0.55 |
| Sarah | 0 | -4.39 |
Last visited: May 24, 2018, 5:52:57 AM