I just started studying decisions trees and I am trying to construct a tree for a training set which uses Status as the class label. I am using the misclassification error as measure of impurity. After the first iteration, the information gain indicates that Department should be the tree root. The following table represents the sub-table for Department = Secretary.
I got to this point and I don't know how to add the corresponding nodes to the tree. Should the next node be Age or Salary?