Numerical Computing with Python

Decision tree working methodology from first principles

In the following example, the response variable has only two classes: whether to play tennis or not. But the following table has been compiled based on various conditions recorded on various days. Now, our task is to find out which output the variables are resulting in most significantly: YES or NO.

1. This example comes under the Classification tree:

Day	Outlook	Temperature	Humidity	Wind	Play tennis
D1	Sunny	Hot	High	Weak	No
D2	Sunny	Hot	High	Strong	No
D3	Overcast	Hot	High	Weak	Yes
D4	Rain	Mild	High	Weak	Yes
D5	Rain	Cool	Normal	Weak	Yes
D6	Rain	Cool	Normal	Strong	No
D7	Overcast