WEKA: how to get the score from classifyInstance?

Question

I\'m using a FilteredClassifier.classifyInstance() to classify my instances in weka.

I have 2 classes (true and false) and I have many positives, so I actually need

Answer 1

distributionForInstance(Instance anInstance) is the method you need. It gives you a Double array showing the confidence for each of your classes. I am using Weka 3.6. and it works well for me. If you always get the same values, your classifier is not trained well and not discriminative at all. In that case, you should always get the same class predicted. Did you balance your training set?