Fig. 2From: Exploratory study on classification of chronic obstructive pulmonary disease combining multi-stage feature fusion and machine learningEvaluation of the framework of multi-stage feature fusion with multiple classifiers. a Performance evaluation of the MSFF on the stage data D1–D4 generated by cross-validation method. While b represents the experimental results by independent test (non-cross-validation method). The x-axis represents the phased data set. The y-axis denotes the prediction accuracy of the proposed frameworkBack to article page