This indicator was introduced by Larry Williams in 2007 and is very similar to the well known OBV indicator.
As such, it should be examined for convergence and divergence with the price trend. The interpretation can be done using the Wyckoff principles.

* Price rises, POIV stays behind => no subsequent demand
* Price meets resistance, POIV reaches new highs => supply (distribution) in the background
* Price and POIV rise synchronously => price trend is intact

These statements can of course be applied correspondingly to falling prices.

Larry Williams wrote for explanation:

Despite the problem, volume indictors have proven their worth, but while it is
a good idea to watch the cumulative flow of buying and selling pressure, you
should not assign all of this buying and selling to bulls and bears. Combined
with other concepts, such as keying off the open, we can focus on something
more germane to trading based just on volume , or what some might consider
related volatility indicators, such as daily ranges.

Futures traders can consider at least one solution to this problem: open
interest. Open interest is the number of outstanding contracts in a particular
market. (...))

The formula is calculating the cumulative sum of open interest times the net
change in price, divided by the true range. We then add the OBV value to this
cumulative sum.

So we first take the net change in price (today’s close minus yesterday’s close)
to get a percentage of where within the range the close was. Not all of the
activity will be buying or selling; the market “tells” us what percentage of
open interest goes to the buy or sell side.

Not only that, it also means we are incorporating price and trend change into
the formula.


One note of warning is necessary. The Williams POIV AD is a specific formula
that compensates for the close within the range relationship, as well telling
us how much OI to use, but it is an indicator, not a trading system. In
practice, it is useful to confirm a trade or to focus attention on a potential
trade. It is not intended to stand as the sole reason to initiate a position
in the market.
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