inst/app/ui/mod_cs_cluster_factoextra/validation_internal.md

In chriszheng2016/zstexplorer: Explorer for China Stock Market Investment

Internal measures, which uses intrinsic information in the data to assess the quality of the clustering.

• Silhouette coefficient

  The silhouette measures how well an observation is clustered and it estimates the average distance between clusters.

Rule to judge: Silhouette coefficient should be maximized * Dunn index

The Dunn Index is the ratio of the smallest distance between observations not in the same cluster to the largest intra-cluster distance.

Rule to judge: The Dunn Index has a value between zero and infinity, and should be maximized

• Connectivity

  The connectivity indicates the degree of connectedness of the clusters, as determined by the k-nearest neighbors.

It corresponds to what extent items are placed in the same cluster as their nearest neighbors in the data space.

Rule to judge: The connectivity has a value between 0 and infinity and should be minimized.

chriszheng2016/zstexplorer documentation built on June 13, 2021, 9:47 a.m.