What you've asked for is my definition of the grail.
If you can know going into the day of trending vs. chop day, you will be a multi-millionaire in a very, very short period of time.
My point is (in case the humor was lost) is that there's many different ways to try to diagnose what type of day is in front of you, but they all have their faults. In my time on boards and trading, I have only seen one person provide anything of substance in this regard but it requires an immense amount of research and data collection, and then analysis. This amount of work would turn most people off. The person I refer to, and sometimes posts here is NihabaAshi. Look up his posts here and elitetrader and you'll get a sense of the amount of work required to come close to having an idea of where the day might go.
