| Keyword | CPC | PCC | Volume | Score | Length of keyword |
|---|---|---|---|---|---|
| internal validity refers to | 0.85 | 0.7 | 9461 | 95 | 27 |
| internal | 0.94 | 0.6 | 2169 | 74 | 8 |
| validity | 0.79 | 1 | 8880 | 43 | 8 |
| refers | 1.64 | 0.7 | 9911 | 32 | 6 |
| to | 0.24 | 1 | 6142 | 89 | 2 |
| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| internal validity refers to | 0.71 | 0.9 | 5164 | 79 |
