Fig. 8
From: Explaining the variation in the attained power of a stepped-wedge trial with unequal cluster sizes
Contour plot of predicted attained power as a function of the treatment group imbalance and the treatment-time period correlation for scenario 79. The red dots correspond to the possible allocations in this scenario. The nearly vertical contour curves show that attained power is determined mainly by the treatment-time period correlation and the treatment group imbalance has only a small impact