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Elbow plot. An automatic procedure recognizes the 6 theoretical clusters groups (within groups sum of squares, WSS6 = 509.13). The k-means method suggests that a good representation of clusters is given from 4 to 10 groups. By using a parsimonious point of view, 4 clusters (phenotypes) were selected (WSS4 = 838.93). According to cluster estimation, the agreement between induced classification and automatic classification was 31.6%.
