Constructing Value Area trends from half-hour auction profiles

A two-layer construction drill

The historical workflow builds session structure from sequential half-hour auctions. Market profile supplies the time-bracketed distribution: initial balance, range extension, single-print extremes, and the migration from a one-bracket probe to a multi-bracket Value Area trend. Volume profile supplies the volume-weighted layer of that same distribution: the highest-volume price, the Value Area where participation concentrates, and the rule that accepted prices attract more volume while rejected prices do not.

Editorial framing for this article treats that workflow as a two-layer drill. First convert each half-hour of acceptance into a duration class so a probe, a rebuilt value pocket, and a multi-bracket Value Area trend remain distinct objects. Then stack those daily objects into an initiating-versus-responsive map of extremes, range extension, and volume-at-price imbalance.

The second layer exists so the worksheet can show whether longer-horizon flow is rewriting value or only answering a probe. That purpose is editorial. The archive facts below describe only how the objects are constructed.

Duration classes from half-hour acceptance

Three trend objects are built from half-hour duration. A price trend occupies one period. A value trend occupies two periods. A Value Area trend occupies three or more periods.

A price trend is the one-bracket construction: price leaves value during a single half-hour period and is rejected before a second bracket can accept it. A value trend is the two-bracket construction: the divergent price is accepted long enough for value to begin forming at the new level. A Value Area trend is the three-or-more-bracket construction: rising volume continues to accept the new prices, movement slows, and the rebuilt Value Area can persist across more than one session.

Rejection, acceptance, and rebuilt value

When a probe is rejected, price is constructed as returning toward established value. When the probe is accepted as fair, volume is attracted and value is rebuilt at the new prices.

A Value Area trend is constructed as slower than a two-period value trend because more volume is being drawn in. That object may span one or more sessions.

Initial auction and secondary auction

The initial auction is taken from the first one or two time periods as day-horizon probes form a balance. The secondary auction is the next two to three half-hour periods, when longer-horizon participation may extend that range.

Editorial note: these two auctions are the session clock against which a one-period probe, a two-period value pocket, and a multi-bracket Value Area trend are timed. Duration is assigned before later initiating and responsive labels are applied.

Initiating and responsive activity

Order flow analysis classifies longer-horizon participation as initiating or responsive, then nets extremes, range extension, and time-price-opportunity imbalance to read which side dominated the session.

Relative to the prior session Value Area, activity inside that area is initiating for both sides. Activity above it is initiating for buyers and responsive for sellers. Activity below it is initiating for sellers and responsive for buyers. Initiating activity is treated as the stronger class. Responsive activity is longer-horizon action answering a price already away from the prior Value Area: selling above that area or buying below it.

Longer-horizon buyers and sellers can occupy the Value Area at different times or prices. The net of that participation is the session's order-flow dominance.

Single-print extremes and the time-price-opportunity tally

Single prints count as extremes only if they occupy two or more adjacent prices and do not occur in the last half hour, because that final bracket is never tested later in the same session. A lone print or a last-period print is not scored as an extreme.

After unqualified single prints are dropped, an unbalanced time-price-opportunity tally above versus below the highest-volume price is read as the longer-horizon lean. One constructed session counted 24 time-price-opportunity letters above and 14 below that price and treated the imbalance as selling preference.

The multi-session auction map

On the multi-session auction map, initiating marks sit nearer the center than responsive marks because initiating is treated as the stronger class. Extremes, range extension, and time-price-opportunity count are ordered in the sequence they usually appear during the day.

A session is labeled triple-initiating when extreme, range extension, and time-price-opportunity are all initiating, and triple-responsive when all three are responsive.

Editorial reading: once each half-hour has a duration class, those three session tags are what the worksheet uses to separate a Value Area trend that longer-horizon flow is rewriting from a probe that is only being answered.