specifies the method of seed initialization in k-means clustering to generate the centroids. You can specify one of the following seed initialization options:
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FC
stands for fast clustering and spreads out the initial seeds in a heuristic way.
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KMPP / <RANDOMSEED=number>
spreads out the initial seeds by introducing a weighted probability distribution in seed selection. For more information, see Arthur and Vassilvitskii (2007).
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RANDOM / <RANDOMSEED=number NRESTART=number>
selects initial seeds by pure randomization.
Note that if CLUSMETHOD=KMPP or RANDOM, you can specify an integer value for the RANDOMSEED= option. If you do not specify a value for the RANDOMSEED= option, the seed is generated by reading the time of day from the computer’s clock. If you want reproducible results, specify an integer for number. Also, if CLUSMETHOD=RANDOM, you can specify the number of restarts by using the NRESTART= option, whose value should be an integer. By default, NRESTART=5. Also, by default, CLUSMETHOD=KMPP.