| Keyword | CPC | PCC | Volume | Score | Length of keyword |
|---|---|---|---|---|---|
| internal validity refers to | 0.77 | 0.7 | 9281 | 99 | 27 |
| internal | 0.37 | 0.1 | 623 | 15 | 8 |
| validity | 0.72 | 0.6 | 9959 | 42 | 8 |
| refers | 0.38 | 0.4 | 5472 | 13 | 6 |
| to | 1.14 | 0.3 | 7903 | 52 | 2 |
| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| internal validity refers to | 0.95 | 1 | 3924 | 100 |
