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Table 11 Prototypicality effect: classification accuracies (acc), mean precision (pre), and mean recall (rec) for training with the training and development instances of AllInst, and testing on those of AllInst, Min2/4, and Min3/4. NoLyr feature set, V3 and A3 tasks, selection by SFFS (of the 286 original features 131 are found as optimal for the A3, and 132 for the V3 task).

From: Determination of Nonprototypical Valence and Arousal in Popular Music: Features and Performances

Type Arousal Valence
% acc pre rec acc pre rec
AllInst 58.5 57.6 58.8 53.3 52.6 54.1
Min2/4 60.1 59.4 61.1 54.8 54.4 56.7
Min3/4 61.4 61.2 65.5 60.9 61.7 64.9
with feature selection
AllInst 61.0 60.0 61.2 55.2 54.5 56.2
Min2/4 63.0 62.5 64.1 57.2 56.8 59.6
Min3/4 64.1 64.5 68.6 60.9 61.1 64.8