pygmi.clust.var_ratio

pygmi.clust.var_ratio#

Variance Ratio.

Functions#

var_ratio(data, uuu, center, dist_orig)

Variance Ratio.

Module Contents#

pygmi.clust.var_ratio.var_ratio(data, uuu, center, dist_orig)#

Variance Ratio.

Calculates the Variance ratio criterion after Calinski and Harabasz, 1974. Does not accept missing data. Max VRC is optimal.

Parameters:
  • data (numpy array) – input dataset

  • uuu (numpy array) – membership matrix (FCM) or cluster index values (k-means)

  • center (numpy array) – cluster centers

  • dist_orig (numpy array)

Returns:

vrc – variance ration criterion

Return type:

numpy array