Decision Trees

Modeling Logic with Decision Trees A graphical representation of a decision situation Decision situation points are connected together by arcs and terminate in ovals Two main components – Decision points represented by nodes – Actions represented by ovals

Modeling Logic with Decision Trees Read from left to right Each node corresponds to a numbered choice on a legend All possible actions are listed on the far right

Sample Decision Tree (Figure 9-10)

How to Construct a Decision Tree Draw a node on the left. – Number it 1. Create a legend, where Number=Question – The order of the questions you ask is important! Branch all possible values to the right. Create new nodes for each branch. – Number them 2. Repeat as necessary. Each successive node number is incremented by 1. Draw actions as ovals on the far right. The tree should connect the nodes to the actions. Redrawing the decision tree is common.

How to Construct a Decision Tree Example for calculating CTI tuition – U/G Part Time (1 to 11 hrs.): $335.00/per hour Full Time (12 to 18 hrs.): $17, * Credit hours over 18 are charged at the part-time rate – Graduate: Part time (1 to 7 hrs.): $520.00/per hour Full time (>= 8 hrs.): $520.00/per hour What questions must you ask? Create a decision tree for this example.