I am doing assignment of Data mining , and stuck on one thing book i am following is "introduction to data mining" by viper kumar , it is "How many instances are misclassified in given decision tree?"
Tree:
True---------+ A+---------------False
| |
| |
| +
+----+------+ True-----+B+-------False
| | | |
| +(25) | | |
| | + |
| | C +--+----------+
+-----------+ + | |
| | -(30) |
True------+------False | |
| | +-------------+
| |
| |
+------+--+ +--+-------+
| | | |
| -(20) | | +(25) |
| | | |
+---------+ +----------+
i am wondering how to calculate it.
Note: i am not asking for solution rather the concept behind it.