METHOD Subcommand (QUICK CLUSTER command)

By default, QUICK CLUSTER recalculates cluster centers after assigning all the cases and repeats the process until one of the criteria is met. You can use the METHOD subcommand to recalculate cluster centers after each case is assigned or to suppress recalculation until after classification is complete. When METHOD=KMEANS is specified, QUICK CLUSTER displays the iteration history table.

KMEANS(NOUPDATE). Recalculate cluster centers after all cases are assigned for each iteration. This is the default.

KMEANS(UPDATE). Recalculate a cluster center each time a case is assigned. QUICK CLUSTER calculates the mean of cases currently in the cluster and uses this new cluster center in subsequent case assignment.

CLASSIFY. Do not recalculate cluster centers. QUICK CLUSTER uses the initial cluster centers for classification and computes the final cluster centers as the means of all the cases assigned to the same cluster. When CLASSIFY is specified, the CONVERGE or MXITER specifications on CRITERIA are ignored.