Fig. 8From: Pharmacological affinity fingerprints derived from bioactivity data for the identification of designer drugsPerformance of the algorithms when varying the expected number of clusters K. The ARI, NMI, and Silhouette were calculated by comparing to K = Pharm external labels. The red line indicates the five-categories of NPS compounds. The default parameter gamma = 1 was used for spectral clustering, and the Ward linkage method was used for hierarchical clusteringBack to article page