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Filters: Bollinger BandsĀ®

Bollinger Bands are calculated using exponential moving averages.

The standard deviation filter is used to confirm other trading signals, and indicates overbought and oversold levels relative to a selected moving average. This is done by comparing values to Bollinger Bands at 1.0 standard deviation above and below the selected moving average. For example:

  • a reading of 250 indicates that closing price is at the 2.5 STD upper band;
  • a reading of zero indicates that closing price is at the moving average; and
  • a reading of -100 indicates that closing price is at the 1.0 STD lower band.

Signals

  • Extremely high readings (eg. Minimum 250) indicate high volatility and possible sell opportunities.
  • Readings above the moving average (eg. Minimum 100) indicate that price is in an up-trend.
  • Extremely low readings (eg. Maximum -250) indicate high volatility and possible buy opportunities.
stock screen bollinger bands standard deviation

To Set the Bollinger Bands filter:

  1. Select the Bollinger Bands filter
  2. Then select the Standard Deviation filter
  3. Set the Day value, using the drop down box
  4. Enter a Minimum or Maximum value
    Minimum = closing price is greater than (or equal to) the value entered
    Maximum = closing price is less than (or equal to) the value enteredĀ 
  5. Click the Add button to add the filter.


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