Fig. 6
From: Explaining the variation in the attained power of a stepped-wedge trial with unequal cluster sizes
The relationship between treatment-vs-time period correlation and attained power among 16 scenarios. Columns represented difference CV values (from left to right: 0.4, 0.7, 1.0, 1.3). Rows correspond to the number of clusters (12 in the first row; 48 in second row). The colors of the plotted points correspond to ICC of 0.1 (blue) and ICC of 0.01 (red). The attained power decreases considerably as the treatment-vs-time period correlation increases