I have the following results from a weka project and I have some problems understanding what they mean. weka results I know that the percentage of correctly classified instances is often called accuracy or sample accuracy, but I don't understand what that means and what does it show me. What information can I get from it? What are the correctly classified instances and the incorrectly? Also on the confusion matrix I know that the sum of the four numbers is the number of the data I have given the program but why are there four numbers in a grid like that. Any information you could provide would be helpful, thank you.
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1 Answers
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Here's an annotation for Weka J48 output I did a couple of years ago when I was teaching a predictive analytics course using Weka. It's too long to paste here.
Note, this is based on J48, but that table of results you show has the same structure for other modules.
https://www.dropbox.com/s/ssst947s2nntqyu/Annotated%20J48%20output.docx?dl=0
