Table 1 Statistical power (at the two-sided 5% significance level) of the simplified design forms shown in Fig. 3, under different models for the time effect (polynomials of degree 2, 4, 6 or 8), to detect effect size δ/σ = 0.3, with K = 30, M = 100, ρ = 0.05, τ = 0.2
Polynomial degree | ||||
|---|---|---|---|---|
Simplified form | 2 | 4 | 6 | 8 |
2-phase | 89% | 37% | 35% | 22% |
3-phase | 90% | 90% | 37% | 33% |
4-phase | 89% | 89% | 89% | 43% |
Staircase | 89% | 89% | 89% | 89% |