Figure 3
From: Robust algorithm for arrhythmia classification in ECG using extreme learning machine
The distribution of feature vectors. The candle bar means the distribution of each beat type's feature. The uppermost part of the bar means 90% of the feature distribution level, the upper side of the box means 75%, the bottom side of the box means 25% and the bottommost part of the bar means 10%. (A) RRI: current RR interval, (B) RRIR: ratio of current RRI to next RRI, (C) 10RRIR: ratio of current RRI to average of late 10 beats, (D) Ramp: R peak amplitude, (E) 1st principal component, (F) 2nd principal component, (G) 3rd principal component and (H) 4th principal component.