<p>I'm currently looking into the class imbalance problem, which is a very common methodological issue on this site, and have been working on a tutorial paper.  The lack of an answer to my question <a href="https://stats.stackexchange.com/questions/539638/how-do-you-know-that-your-classifier-is-suffering-from-class-imbalance">&quot;How do you know that your classifier is suffering from class imbalance?&quot;</a> suggests there are some issues with current practice that need to be addressed.  Cross Validatated seems a good place for finding out what people actually do (or don't do)</p>
