Table 8 Predicted powers for three effect sizes in combination with different cluster sizes and the number of clusters = 20, prevalence rate = 50%, OTE = log(1.68) for a simple exchangeable correlation structure
Magnitude of HTE with I = 20 | method | m | |||||
|---|---|---|---|---|---|---|---|
20 | 40 | 60 | 80 | 100 | 120 | ||
\({\theta }_{3}={\text{log}}\left(1.5\right)\) | GEE | 0.531 | 0.821 | 0.941 | 0.982 | 0.995 | 0.999 |
GEE-KC | 0.506 | 0.797 | 0.927 | 0.976 | 0.993 | 0.998 | |
GEE-MD | 0.481 | 0.771 | 0.911 | 0.968 | 0.989 | 0.997 | |
\({\theta }_{3}={\text{log}}\left(2\right)\) | GEE | 0.936 | 0.998 | 1.000 | 1.000 | 1.000 | 1.000 |
GEE-KC | 0.921 | 0.997 | 1.000 | 1.000 | 1.000 | 1.000 | |
GEE-MD | 0.904 | 0.996 | 1.000 | 1.000 | 1.000 | 1.000 | |