I have two questions:

1.In the Test options of Classify tab there are four options.What is the difference of the "Using Training set" and "Cross-validation"?

2.If I choose J48 and the "Using Traning set",I will get the decision tree.But I do not  understand what the "summary" section and "Detailed Accuracy By Class"section mean.I guess from the value of those figure we can tell wether the tree is good or not.Can anybody give me a more detailed explanation?

Thank you all!


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