Fig. 1From: Heart rate variability as a biomarker in patients with Chronic Chagas Cardiomyopathy with or without concomitant digestive involvement and its relationship with the Rassi scoreFeature selection using the four machine learning algorithms. S: selected feature; KNN: k-nearest neighbors; SVM: support vector machine; MLP: multilayer perceptron; RF: random forest. For the description of HRV indices (columns), please see the textBack to article page