BBF (Bollinger bands flat)

Bollinger bands flat indicator provides the same data as Bollinger bands but is displayed in a separate field and thus makes it easy to determine whether prices are in or out of the band.

This indicator consists of:

• Zero line – shows zero on the chart for user convenience;

• Positive deviation – shows the value of the positive standard deviation, shifted N times up;

• Negative deviation – shows the value of the negative standard deviation shifted N times down;

• Delta – shows the difference between the current value and the value of the moving average at a given point.

Calculation

As can be understood from the above, only three components of the indicator are calculated:

Delta = ClosePrice - MA, where

ClosePrice is the current value of the Close price,

MA - the value of the moving average.

Positive deviation = A * D, where

A - deviation parameter value,

D - dispersion relative to the moving average,

Negative deviation = (-1) __A * D

Main parameters

• Sources prices for MA – the type of price at which the indicator will be calculated for the selected period. Available values: Low, Open, High, Close, Typical, Medium, Weighted;

• Type of moving average – type of moving average calculation. Available values: Simple, Exponential, Modified, Linear weighted;

• Period – the number of periods involved in the indicator calculation;

• Deviation – the number of standard deviations;

• Shift – the number of indicator values by which there will be a shift up or down by the number of standard deviations.

This looks as follows on the chart: