| Value | Category | Cases | |
|---|---|---|---|
| 0 | No incentive | 0 |
0%
|
| 1 | 5$ incentive | 73 |
24.8%
|
| 2 | 10$ incentive | 52 |
17.7%
|
| 3 | 15$ incentive | 169 |
57.5%
|
| Sysmiss | 3622 |