Williams A/D Indicator

Williams A/D Indicator, with three choices of ema (regular, double, and zero-lag). Running sum of positive accumulation values (buying pressure) and negative distribution values (selling pressure), as determined by price's location within a given day's true range. Williams states that it is worth selling if the price makes a new high and the indicator fails to follow suit. As well, it's better to purchase if prices fall to a new bottom while the A/D indicator fails to reach a new low.