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The dendrogram is a graphical summary of the cluster
solution.
Cases are listed along the left vertical axis.
The horizontal axis shows the distance
between clusters when they are joined.
Parsing the classification tree to determine the number of clusters is a
subjective process. Generally, you begin by looking for "gaps"
between joinings along the horizontal axis.
Starting from the
right, there is a gap between 20
and 25, which splits the automobiles
into two clusters.
There is another gap from approximately
10 to 15,
which suggests 6 clusters.
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Dendrogram |