Volume-adjusted MA

What is a Volume-adjusted MA?

A volume-adjusted moving average weights each bar's price by how much trading it carried, so heavily traded bars pull the average toward their price and quiet bars barely register. The idea is usually credited to Richard Arms, the EquiVolume developer: his construction allocates weight in fixed volume increments and reaches back over however many bars are needed to accumulate them, so the effective lookback stretches in thin trade and compresses when activity surges.

The label is looser than most moving-average names. Many modern implementations keep a fixed window and weight each bar by its volume relative to average volume, which lands close to a VWMA; others reproduce Arms' elastic-lookback version. The shared premise is that prices where heavy volume changed hands say more about accepted value than prices printed on thin activity, so volume rather than time alone should set each bar's influence.

How traders use it

• As a participation-weighted trend baseline: price holding above a rising volume-adjusted MA suggests the heavily traded prices are stacking up beneath the market, and crosses are read like any MA cross, with heavy-volume bars moving the line fastest.
• As a filter on thin drift: quiet bars barely move the line, so an extended move on weak relative volume that fails to drag the average with it is treated with suspicion.
• As a drop-in replacement for time-weighted averages in crossover or band logic when the builder wants responsiveness tied to activity instead of a fixed period.

Volume-adjusted MA vs neighboring averages