If you can use that data for trading, than use it! Good for you! In my experience, the PRV doesn't reliably predict the volume bar's length (it only helps in noticing the jump in momentum), and the volume bar's length doesn't predict the corresponding price bar's length (especially at turns, when it maters most).
"Volume leads price" refers to volume events indicating what the price is likely to do on the next bars, both as direction and as momentum. So, a volume bar contains usable information regarding future price bars. It is all part of of the P, V, A/D sequencing (scoring).
Obviously, this is how I see it. You're welcome to disagree. I thought that my input might help others in not wasting their time with irrelevant data. We all read Jack's words and understood them differently, this applying to Spydertrader, Makosgu, and other brighter pupils of the method too. There is a saying "seeing is believing". Unfortunately, more often, it works the other way around: "believing is seeing" (or, in other words: you see what you believe to be).
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I wasn't disagreeing with you. Apologies if my writing came off that way. Rather I was wondering how you interpret volume leading price. Whenever I read Jack, it's kind of all over the place. One way volume leading price is THE pattern (gaussians), that we can look at to gauge at what point of the trend it's currently sitting on. But Jack also mentions volume pace and how much profit we can expect according to the pace, so I thought vol vs vola is also relevant in anticipating the next action.
I also have been looking at the scoring system more closely and have been pondering how I can score every bar accordingly. My interpretation of it was, 0 is DU volume, 7 is FRV, 7 to 4 is our profit opportunity, 3 to 0 is where we anticipate reversal (FTT?). The volume increases(7-6) then decreases(5-4) then peaks (3-2) and dries up (1-0). Now, I'm still confused about how to identify A/D regarding the scoring system though. We have volume (independent variable) and price (dependent variable), what does that make A/D? How do you input increase or decrease for A/D? Price action? This part has been a mystery for me for quiet some time. Can you point me to the right direction?
I very much appreciate your input.