Indicators
  Absolute Price
  Accum / Dist
  ADX
  Average True Range
  Bollinger Bands
  Chaikin Money Flow
  Chaikin Oscillator
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  Exp Moving Ave.
  MACD
  Mass Index
  Momentum
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  Simple Moving Average
  Negative Volume
  On Balance Vol
  Percentage Price
  Percentage Volume
  Positive Volume
  Price Volume Trend
  Range Envelope
  Rate of Change
  RSI
  Stochastic
  Stochastic RSI
  Volume ROC
  Volume ROC %
  Williams % R
General
Basic Tools
Price Tools
Stop Loss Tools
Volume Rate of Change % Indicator (VROC%)
The Volume Rate of Change % Indicator (VROC%) is similar to the VROC in that it measures the momentum of the Volume in the market. However the difference being is that it reports as a percentage of change, thus displaying the relative volume heartbeat of the market.

[(Today's Volume - (Today - n periods Volume))/(Today - n periods Volume)] * 100



click for a larger image
As can be seen on the chart, the volume spikes become readily visible when taken in context to the rest of the market. Whilst the average can be seen to represent the common heartbeat for the market, it is the 'heart attacks' that become visible when extreme points are made.


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