DN.Whclust              Hierarchical Clustering for data nuggets
DN.Wkmeans              K-means Clustering for data nuggets
DN.Wpca                 Weighted PCA for data nuggets
DNcluster.predict       Predict the closest clusters for a new dataset
                        based on clusters of data nuggets.
WCluster-package        Clustering and PCA with Observational Weights
                        and/or Variable Weights, and Data Nuggets
                        Clustering
Whclust                 Hierarchical Clustering with observational
                        weights
Wkmeans                 K-means Clustering with observational weights
Wpca                    Weighted PCA
cluster.predict         Predict the clusters for a new dataset.
distw                   Distance between clusters based on Ward's
                        method for observations with weights
wmean                   Cluster Centers for observations with weights
wss                     Sums of squares of residuals for observations
                        with weights
wwcss                   Weighted Within Cluster Sum of Squares
