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NRMSE curves obtained from the NMF, RF, ORI, and kNN methods applied on MNAR and MM patterns and MAR/MCAR patterns with different missing percentages. Fifty missingness datasets were generated randomly from Dataset I (A,E), Dataset II (B,F), Dataset III (C), and Dataset IV (D). Error bars represent the standard deviation with * denoting p < 0.05 (t-test with BH adjusted) relative to the NMF-based method.
