The differences in tree size are insignificant for both goodness measures. Negative values on the x-axis show instances where lookahead produced inferior trees. The corresponding picture for Greedy-Gini looks nearly identical and is shown in Fig. . The peaks for accuracy, tree size and maximum depth in Fig. coincide with those in Figure . It is interesting to note that there were more trees for which lookahead hurt accuracy than there were those for which it benefited.
Section shows an example of pathology.