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Cut dendogram at a certain similarity
I am in the process of evaluating some data and I wanted to compare different types of clustering. I found the 'Map Clustering on Labels' operator that lets me compare the results of the clustering with my sample data. This all works fine but I am concerned about the following scenario.
Let's say I have an example set that has examples from three different classes. I realize that using kmeans with an initial number of 2 expected clusters will obviously end up with two result clusters and probably with a higher failure in the performance evaluation. However the agglomerative clustering has the potential at performing better, as the number of clusters doesn't have to be known before the process. To make this work the resulting dendogram has to be cut at a certain point of similarity.
I have searched the list of operators but have only found the 'Flatten Clustering' operator that lets me choose the number of clusters. Searching the forums I have found this thread from 2010: http://rapid-i.com/rapidforum/index.php/topic,1734.0.html
Has there been any progress on this since 2010? Am I missing an operator to achieve this? Do I have to install a plugin?
Thanks in advance for your help,