Quote from PointOne:
LOL. Not before? IF 0 perhaps: lead the market!
When would you consider that the reversal was incorrect (hypothetically)? Do you keep an "APA" or equivalent line at the Open, or above?
Or: is this possibility simply not on the table given the context?

My answered assumed a trader
only had the ability to use ES and YM - Price and Volume. Dom Walls, STR-SQU, Tic Charts and Time & Sales don't yet have a place in the trader arsenal.
As such, let's look at this situation from the standpoint of 'Falling Dominos' and what
must come next.
At some Point, as the Bar in question forms, the trader realizes (through PRV calculation) that the bar
must close showing
decreasing Volume. At this point in time, the trader begins to anticipate change (as indicated by the Jokari Window). Since (by previous rule set), the ES failed to 'give permission' to the trader to go and 'look' at the YM, what
must come next if Price is headed higher and the market signals change? Price must head lower! One of the first indications of such an event is watching as Price heads below its open (again, without the use of finer tools).
Since this sequence begins to materialize
Intra-bar, when Price begins to head lower, the trader expects to 'see' the bar also
close lower - confirming an Intra-bar Gaussian Shift. As the
next bar opens, the trader continues to monitor in an effort to insure the dominos keep falling. What must the trader 'see' on the YM? What must the trader see on the ES? Wash. Rinse. Repeat.
With respect to APA, I do not employ its use
ever. It simply is not necessary. If a trader
knows what
must come next in order to remain on the
right side of the market, while at the same time, knowing what
must come next for the market to indicate the trader is on the
wrong side of the market, then the trader requires no additional techniques to succeed.
As to how to know (in this
specific example) if the market 'changed its mind' and no longer planned to signal change at close of bar, we all know the very simple answer. Volume would have had to move to
increasing Volume with price headed higher (and a close
above the open). When the next bar opens, Price heading higher on
increasing black PRV would indicate the market had chosen to return to the previous dominant direction, rather than, continuing to show
decreasing red as it did.
As you can see, APA, has no purpose in a paradigm where one
knows the sequences of how Price can move. One simply has to wait for the market to confirm or invalidate the current course of action.
I hope you found the above information useful.
- Spydertrader