Going shopping – dealing with data inconsistencies

We have the following data about the shopping preferences of our friend, Jane:

Temperature	Rain	Shopping
Cold	None	Yes
Warm	None	No
Cold	Strong	Yes
Cold	None	No
Warm	Strong	No
Warm	None	Yes
Cold	None	?

 

We would like to find out, using a decision tree, whether Jane would go shopping if the outside temperature was cold with no rain.

Analysis

Here, we should be careful, as there are instances of the data that have the same values for the same attributes, but different classes; that is, (cold,none,yes) and (cold,none,no). The program we made would form the following decision tree:

    Root
    &...