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Fig. 4 | BMC Medical Research Methodology

Fig. 4

From: Multiple imputation by predictive mean matching in cluster-randomized trials

Fig. 4

Bias in the treatment group mean estimate after MI with a misspecified imputation model. Missing data were generated completely at random (MCAR in red) or at random (weak MAR in green or strong MAR in blue) at a rate of 40%. From top to bottom, results are presented in increasing order of cluster sizes m within an increasing order of number of clusters k. Filled circles indicate PMM methods while open circles indicate parametric (NORM) methods

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