So, if we look at my plot of CCC, that good performance will be, if there are more than 4 clusters ( more 2000 points)?
It is best to review the report since the CCC is just one way to evaluate a candidate number of clusters, and there are situation where the CCC might not be the best statstic to use. The goal of clustering is typically to provide interpretable and/or usable results for your analysis needs. Think of the CCC plot as recommending a range of cluster solutions that might be useful and you can then compare the competing solutions for which one best meets those needs.
When I see the CCC increasing slowly over the larger number of clusters, I would expect the additional splits to be pulling off clusters with small numbers of observations which can be useful if you are trying to isolate unusual potentially fraudulent cases but is not helpful if you are doing marketing where small clusters are not large enough to warrant special treatment. Check multiple cluster solutions and choose what is best for your scenario.
Hope this helps!
Doug
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