An indicator that measures not volume itself but the speed at which it grows or shrinks. It surfaces the moment interest starts gathering, as acceleration swinging around a zero line, before price moves at all.
The Volume Rate of Change (VROC) measures not the level of volume but the speed at which it is changing.
Think of it as the price ROC (Rate of Change) applied directly to volume. It expresses, as a percentage, how much today's volume has grown or shrunk compared with N bars ago.
The point worth noticing is that VROC carries no direction.
Where OBV accumulates volume by whether the day was up or down, VROC does not ask which way volume went.
It only asks how fast the fuel of volume is being poured in right now, and shows that acceleration alone, swinging above and below a zero line.
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NASDAQ:AAPL
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