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Numerical measures that are applied to judge various aspects of cluster validity, are classified into the following two types. External Index: Used to measure the
Numerical measures that are applied to judge various aspects
of cluster validity, are classified into the following two types.
External Index: Used to measure the extent to which cluster labels
match externally supplied class labels.
Entropy
Internal Index: Used to measure the goodness of a clustering
structure without respect to external information.
Sum of Squared Error SSE
You can use external or internal indices to compare clusters or
clusterings
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