I have a classification tree, and I have a question regarding the order of the variable importance.
For example, I have variable with their importance score:
SDL - 40
LCT - 16
CIS - 10
ML - 9
IC - 3
Hour - 3
Looking to their score, ML is more important than OCS, however when I build the classification only SDL, LCT, CIS, and OCS variables were splitted in the decision tree? How is that ML were not shown in the tree when in fact it obtain a higher score than OCS?