Bill Williams AC

The acceleration indicator (AC) was developed by Bill Williams to help traders identify market momentum changes. The Accelerator Oscillator indicator is the difference between the Awesome Oscillator indicator (AO) and the 5-period moving average of the indicator itself, which shows effectively how fast the AO changes and predicts what happens next. If the AC is in the positive zone, it means that, most likely, the accelerated upward movement will continue. If the AC is in the negative zone, a downward acceleration will take place. The bars on the histogram have two colors: red, which indicates a price fall, and green, which indicates a price increase. A wide variety of buy and sell signals can be received from the bars’ color, depending on whether they are above or below the zero line.

The indicator view in the chart.

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The indicator has the following parameters:

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Long Period - setting of the indicator calculation long period.

Short Period - setting of the indicator calculation short period.

Signal Period - setting of the indicator values smoothing period.


Source - setting of the indicator calculation parameters:

  • Open
  • High
  • Low
  • Close
  • Volume


Panel/Moving average period - selection of the indicator location in the chart:

  • New panel
  • Chart

Up, Down, Neutral

Show value - display of the indicator value on the price scale on the left.

Scale/Auto-scaling - if this option is on, the scale will be automatically calculated, based on the minimum and maximum indicator values, so that the indicator would fit in the chart.

Color - color setting of the indicator.

Visual type - visual setting of the indicator display in the chart:

  • Line
  • Histogram
  • Hash
  • Block
  • Cross
  • Square
  • Dots
  • Up arrow
  • Down arrow
  • Axis label
  • Hide

Line style - setting of the line display style:

  • Solid
  • Dash
  • Dash - dot
  • Dash - dot - dot

Width - setting of the indicator line width.

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