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Boxplots of root mean squared error for KNN-TN, KNN-CR and KNN-EU for 100 datasets, 50 samples by 400 metabolites. Total missing was considered at 9%, 15% and 30% and within each missing MNAR is greater than MAR. The three correlation structure used was i) only positive correlation 0.7, ii) AR(1) correlation 0.9 and iii) mixed correlation 0.7
