Visualizing Classification Errors
Right-click the trees.J48 entry in the result list and choose Visualize classifier
errors. A scatter plot window pops up. Instances that have been classified correctly
are marked by little crosses; ones that are incorrect are marked by little
squares.
Exercise 17.1.10. Use the Visualize classifier errors function to find the
wrongly classified test instances for the cross-validation performed in Exercise
17.1.9. What can you say about the location of the errors?