Ordering Weight


The ordering weight controls in what vertical order the rows are displayed in the row dendrogram. For column dendrograms it controls the horizontal order of the columns. The two subclusters within a cluster (there are always exactly two subclusters) are weighted and the cluster with the lower weight is placed above (to the left of) the other cluster. The weight can be any one of the following:

hc_ordering_average_value_eq_1.png

Calculating the weight of a cluster

To calculate the weight w3 of a new cluster C3 formed from two subclusters C1 and C2 with a weight of w1and w2, and each containing n1 and n2 rows, you use the following expression:

hc_ordering_calculate_weight_eq_1.png

See also:

Overview of Hierarchical Clustering Theory