distance must be a metric in order for hierarchical clustering to be valid which distance is not a metric which of the following is a metric in hierarchical clustering? what is hierarchical cluster what can be used to cluster a metric distance? if a distance is a metric, can clustering be used? what is the distance metric what metric distances what is a metric distance which metric is used for hierarchical clustering and is used by the clustering algorithms in the clustering algorithm? can clustering clusters be metric? is the distance a metric what is the difference between a distance and a metric why is hierarchical clustering a good idea do hierarchical clusters require metric is distance metric for hierarchical clustering distance clustering is hierarchical clustering metric what is the distance in hierarchical clustering does hierarchical clustering need a distance