Tree View (Dendrogram)
The Tree View page displays the results of performing a cluster analysis on the similarity matrix and displays the result in a tree format. The Tree View shows card clustering from strong to weak - left to right. Hovering over any cluster circle will show you the strength of that cluster as a percentage. 100% meaning all participants grouped those cards together. 50% meaning half of the participants placed those cards in the same group.
About Cluster Analysis
Simple Card Sort utilizes an average link cluster processing to produce its results. This algorithm finds a set of cards( two or more ) with the highest similarity score/percentage. It then forms a cluster and replaces the items in the set with the cluster. The process is then repeated. When a cluster is analyzed against another card or cluster, the average of the similarity scores between all members is used.