Market Velocity & Forces
Nasdaq Velocity and Forces measure levels of pre-trade order activity in the Nasdaq trading system. These indicators are more effective than gauging physical activity or audible noise on a trading floor because they precisely measure and benchmark real-time activity. Additionally, it filters out irrelevant messages (such as orders priced far from the inside market). The data feed uses 21-days of historical data to calculate an expected value for Market Velocity for each stock at each time of day.