4. Discard sample subsets with fewer than Nmin members
If Sj contains Nj members and Nj < Nmin , discard zj and reduce Nc by 1. The members of the discarded class may be dealt with in a number of ways, peculiar to the specific algorithm. They may be:
a. incorporated into other clusters
b. ignored for this iteration
c. assigned to an unclassified group and ignored for the rest of the procedure.