Table 3 Generic hypotheses used for the assessment of construct validity and responsiveness
A priori rules for hypothesis testing | |
|---|---|
Convergent validity | |
1 | If construct being measured is the same or similar to that measured by the instrument then the correlation should be r ≥ 0.5 |
2 | If construct being measured is dissimilar but related to that measured by the instrument then the correlation should be between r = 0.3 and 0.49 |
3 | If construct being measured is judged as unrelated to that measured by the instrument then the correlation should be r < 0.3 |
Known groups validity/responsiveness | |
1 | Differences between groups where a large difference is expected should be d ≥ 0.8 |
2 | Differences between groups where a medium difference is expected should be between d = 0.5 and 0.79 |
3 | Differences between groups where a small difference is expected should be between d = 0.2 and 0.49 |
4 | Differences where no or a trivial difference is expected should be d < 0.2 |