Tightness of cluster and Cluster Similarity (distance between clusters)
Intra cluster distance: (tightness of a cluster)
Can be calculated as the sum/minimum/maximum/average between all the pairs inside the cluster OR diameter - distance between the two farthest points in the cluster.
Inter cluster distance: (distance between various clusters)
Complete link : Distance between the farthest pair of points of the given clusters.
Single link : Distance between the closest pair of points of the given clusters.
--Shreejay
