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Cluster Validation - Kent

Cluster ValidationCluster Validity For supervised classification we have a variety of measures to evaluate how good our model is Accuracy, precision, recall For Cluster analysis, the analogous question is how to evaluate the goodness of the resulting clusters? But clusters are in the eye of the beholder ! Then why do we want to evaluate them? To avoid finding patterns in noise To compare clustering algorithms To compare two sets of clusters To compare two clustersClusters found in Random Data00 . 20 . 40 . 60 . 8100 . 10 . 20 . 30 . 40 . 50 . 60 . 70 . 80 . 91xyRandom Points00 . 20 . 40 . 60 . 8100.

High correlation indicates that points that belong to the same cluster are close to each other. ... Cluster separation is the sum of the weights between nodes in the cluster and nodes outside the cluster. Internal Measures: Cohesion and Separation cohesion separation

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