| Keyword | CPC | PCC | Volume | Score | Length of keyword |
|---|---|---|---|---|---|
| internal validity definition | 1.63 | 0.1 | 947 | 51 | 28 |
| internal | 0.38 | 0.7 | 1365 | 17 | 8 |
| validity | 0.26 | 1 | 7570 | 61 | 8 |
| definition | 1.83 | 0.9 | 6867 | 23 | 10 |
| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| internal validity definition | 1.37 | 0.7 | 6885 | 51 |
