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  3. Cluster Analysis in R

Exercise

Elbow (Scree) plot

In the previous exercises you have calculated the total within-cluster sum of squares for values of k ranging from 1 to 10. You can visualize this relationship using a line plot to create what is known as an elbow plot (or scree plot).

When looking at an elbow plot you want to see a sharp decline from one k to another followed by a more gradual decrease in slope. The last value of k before the slope of the plot levels off suggests a "good" value of k.

Instructions

100 XP
  • Continuing your work from the previous exercise, use the values in elbow_df to plot a line plot showing the relationship between k and total within-cluster sum of squares.