I don't think it can be predicted in any traditional sense any more. It used to follow some certain patterns, however the world and market is entirely different now. We have a massive amount of retail investors who were never involved before, and a sharing of information that takes seconds to spread around the world, so attitudes can shift almost instantly and affect market sentiment/action. It's going to take some time and more larger events to occur before we'll have enough data to make new reliable prediction patterns in this field.