Select a method for joining clusters to form linkage groups via hierarchical clustering . Different algorithms might work better than others depending on your data.
The average distance (recombination rate) between pairs of markers from different clusters. The maximum distance (recombination rate) between a marker in one cluster and a marker in a different cluster. The minimum distance (recombination rate) between a marker in one cluster and a marker in a different cluster.See the CLUSTER Procedure documentation in SAS/STAT for more information.