Table 4.
Empirical power estimates for 0.05 level test of the null hypothesis H0: no treatment-covariate interaction, for overall treatment effect α1 = 0.2 and α2 = 0.4, and varying treatment-covariate interaction effect, based on a total sample size n = 150 (50 subjects in each treatment group)
| γ 11 | γ 12 | γ 21 | γ 22 | Perm | LRT |
|---|---|---|---|---|---|
| 0.1 | 0 | 0.1 | 0 | 0.055 | 0.072 |
| 0.1 | 0 | −0.1 | 0 | 0.052 | 0.063 |
| 0.5 | 0 | 0.5 | 0 | 0.104 | 0.121 |
| 0.5 | 0 | −0.5 | 0 | 0.273 | 0.304 |
| 1.0 | 0 | −1.0 | 0 | 0.914 | 0.925 |
| 0 | 0.1 | 0 | 0.1 | 0.062 | 0.073 |
| 0 | 0.1 | 0 | −0.1 | 0.066 | 0.084 |
| 0 | 0.5 | 0 | 0.5 | 0.370 | 0.442 |
| 0 | 0.5 | 0 | −0.5 | 0.902 | 0.922 |
| 0 | 1.0 | 0 | −1.0 | 1.000 | 1.000 |
| 0.1 | 0.1 | 0.1 | 0.1 | 0.065 | 0.073 |
| 0.1 | 0.1 | −0.1 | −0.1 | 0.071 | 0.091 |
| 0.5 | 0.5 | 0.5 | 0.5 | 0.476 | 0.535 |
| 0.5 | 0.5 | −0.5 | −0.5 | 0.963 | 0.963 |
| 1.0 | 1.0 | −1.0 | −1.0 | 1.000 | 1.000 |