Consider the R example below:
plot( hclust(dist(USArrests), "ave") )
What exactly does the y-axis "Height" mean?
Looking at North Carolina and California (rather on the left). Is California "closer" to North Carolina than Arizona? Can I make this interpretation?
Hawaii (right) joins the cluster rather late. I can see this as it is "higher" than other states. In general how can I interpret the fact that labels are "higher" or "lower" in the dendrogram correctly?