Figure 7From: Comparing denominator degrees of freedom approximations for the generalized linear mixed model in analyzing binary outcome in small sample cluster-randomized trialsThe diminished power loss of GLMM Wald F test with Kenward-Roger approximation of denominator degrees of freedom with the increase of cluster number in analyzing CRTs with few heterogeneous clusters. The observed powers and the 95% confidence intervals are calculated from 1000 independent simulation replicates.Back to article page