Revisiting Diamondbacks Expected Offensive Statistics Share this story Photo by Norm Hall/Getty Images You’ve heard of wOBA and xwOBA before. For some they are familiar terms, for others they’re just more alphabet soup acronyms. I’ll try to make this as simple and painless as possible. wOBA = Weighted On Base Average. This stat simply takes each way of getting on base and attaches a value to that on base event based on how much those events contribute to run scoring. Obviously in a context neutral situation, a double is worth more than a single, a single is worth more than a walk, a homer is worth more than anything, etc. A more detailed explanation including formula can be found HERE. But the summary simply says: