1. How decision tree is derived from a data set
: A case of predicting Play/Not Play with weather information

2. A sample problem Predict Play or Not Play (ex: Playing Golf)
:output, target variable
with 4 independent variables(input or decision variable) such as
outlook
temperature
humidity
windy

3. Output Variables(target variables)
Decision Variables
Output Variables(target variables)
.Play (golf)
.Not Play(golf)

4. Data set(14 records in it)

5. But, it still needs to be refined!
Sort data with outlook
But, it still needs to be refined!

7. Final Decision Tree Induced from Data