| kselection-package | Selection of K in K-Means Clustering | 
| get_f_k | Get the f(K) vector | 
| get_k_threshold | Get the 'k_threshold' | 
| kselection | Selection of K in K-means Clustering | 
| num_clusters | Get the number of clusters. | 
| num_clusters_all | Get all recommended numbers of clusters | 
| set_k_threshold | Set the 'k_threshold' |