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) seems right.

Maybe it is not working for you because the classifier doesn't know you'd need the confidence values? For example for LibSVM on Weka Java, you need to set setProbabilityEstimates to true, in order to use the scores.