title: How to deal with frequent classes?
body: <p>I'm working on a classification task in Weka and got the problem that my class to predict has one value that is very frequent (about 85%). This leads to a lot of learning algorithms just predicting this frequent value of this class for a new dataset. </p>
  
  <p>How can I deal with this problem? Does it just mean that I didn't find features that work well enough in predicting something better? Or is there something specific I can do to solve this problem?</p>
  
  <p>I guess this is a pretty common problem, but I was not able to find a solution to it here.</p>