| ARI.F | Fuzzy adjusted Rand index | 
| butterfly | Butterfly data | 
| cl.memb | Cluster membership | 
| cl.memb.H | Cluster membership | 
| cl.memb.t | Cluster membership | 
| cl.size | Cluster size | 
| cl.size.H | Cluster size | 
| Fclust | Fuzzy clustering | 
| Fclust.compare | Similarity between partitions | 
| Fclust.index | Cluster validity indexes | 
| FKM | Fuzzy k-means | 
| FKM.ent | Fuzzy k-means with entropy regularization | 
| FKM.ent.noise | Fuzzy k-means with entropy regularization and noise cluster | 
| FKM.gk | Gustafson and Kessel - like fuzzy k-means | 
| FKM.gk.ent | Gustafson and Kessel - like fuzzy k-means with entropy regularization | 
| FKM.gk.ent.noise | Gustafson and Kessel - like fuzzy k-means with entropy regularization and noise cluster | 
| FKM.gk.noise | Gustafson and Kessel - like fuzzy k-means with noise cluster | 
| FKM.gkb | Gustafson, Kessel and Babuska - like fuzzy k-means | 
| FKM.gkb.ent | Gustafson, Kessel and Babuska - like fuzzy k-means with entropy regularization | 
| FKM.gkb.ent.noise | Gustafson, Kessel and Babuska - like fuzzy k-means with entropy regularization and noise cluster | 
| FKM.gkb.noise | Gustafson, Kessel and Babuska - like fuzzy k-means with noise cluster | 
| FKM.med | Fuzzy k-medoids | 
| FKM.med.noise | Fuzzy k-medoids with noise cluster | 
| FKM.noise | Fuzzy k-means with noise cluster | 
| FKM.pf | Fuzzy k-means with polynomial fuzzifier | 
| FKM.pf.noise | Fuzzy k-means with polynomial fuzzifier and noise cluster | 
| houseVotes | Congressional Voting Records Data | 
| Hraw | Raw prototypes | 
| JACCARD.F | Fuzzy Jaccard index | 
| Mc | McDonald's data | 
| MPC | Modified partition coefficient | 
| NBA | NBA teams data | 
| NEFRC | Non-Euclidean Fuzzy Relational Clustering | 
| NEFRC.noise | Non-Euclidean Fuzzy Relational Clustering with noise cluster | 
| PC | Partition coefficient | 
| PE | Partition entropy | 
| plot.fclust | Plotting fuzzy clustering output | 
| print.fclust | Printing fuzzy clustering output | 
| RI.F | Fuzzy Rand index | 
| SIL | Silhouette index | 
| SIL.F | Fuzzy silhouette index | 
| summary.fclust | Summarizing fuzzy clustering output | 
| synt.data | Synthetic data | 
| synt.data2 | Synthetic data | 
| unemployment | Unemployment data | 
| VAT | Visual Assessment of (Cluster) Tendency | 
| VCV | Visual Cluster Validity | 
| VCV2 | (New) Visual Cluster Validity | 
| VIFCR | Visual inspection of fuzzy clustering results | 
| XB | Xie and Beni index |