| Keyword | CPC | PCC | Volume | Score | Length of keyword |
|---|---|---|---|---|---|
| external validity definition | 0.36 | 0.5 | 9699 | 3 | 28 |
| external | 0.94 | 0.4 | 7544 | 31 | 8 |
| validity | 0.69 | 0.4 | 5302 | 49 | 8 |
| definition | 0.88 | 0.8 | 5194 | 80 | 10 |
| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| external validity definition | 1.05 | 0.2 | 7261 | 99 |
