Volume Weighted Volatility
Volume weighted volatility is our own proprietary version of the standard volatility algorithm. Roughly speaking, this is like the normal volatility algorithm, applied to an equi-volume graph. We expect the stock price to move more when the stock trades more, and less when the stock trades less.
We use volume weighted volatility in most of our alerts. Since alerts are intended to point out unusual events, the server needs to know how much each stock normally moves.