William's Variable Accumulation Distribution measures the buying and selling pressure on a security by comparing the net price movement with its range and weighting by the volume for the same period. The distribution is smoothed by taking a moving average of these values over a term that you determine.

Generally, a negative Variable Accumulation Distribution would indicate net selling pressure and a bearish market. A positive Variable Accumulation Distribution would indicate the opposite.

You may wish to add some type of Moving Average to this indicator's graph.