.netCHARTING v10.5 Documentation


dotnetCHARTING Namespace > StatisticalEngine Class > BollingerBands Method : BollingerBands(SeriesCollection,Double,Int32) Method
A collection of series objects. For example, to evaluate this indicator for two series you will need to pass a series collection containing this two series.
The (positive) number of standard deviations which the lower band in shifted from the moving average.
The length of the moving average used within the evaluation of the Bollinger Bands. Note that this also corresponds to the length of the period over which the standard deviation is evaluated.
BollingerBands(SeriesCollection,Double,Int32) Method
Within this class we offer procedures which evaluate the upper and lower Bollinger Bands.
Syntax
'Declaration
 
Public Overloads Shared Function BollingerBands( _
   ByVal sc As SeriesCollection, _
   ByVal standardDeviationLevel As Double, _
   ByVal lengthOfMA As Integer _
) As SeriesCollection
'Usage
 
Dim sc As SeriesCollection
Dim standardDeviationLevel As Double
Dim lengthOfMA As Integer
Dim value As SeriesCollection
 
value = StatisticalEngine.BollingerBands(sc, standardDeviationLevel, lengthOfMA)

Parameters

sc
A collection of series objects. For example, to evaluate this indicator for two series you will need to pass a series collection containing this two series.
standardDeviationLevel
The (positive) number of standard deviations which the lower band in shifted from the moving average.
lengthOfMA
The length of the moving average used within the evaluation of the Bollinger Bands. Note that this also corresponds to the length of the period over which the standard deviation is evaluated.
Remarks

Further Details

Bollinger Bands are a type of envelope that are plotted at standard deviation levels above and below the corresponding (simple) moving average. This produces an effect of having the bands widen during periods of higher volatility and contract during less volatile periods. Bollinger Bands indicate the relative supply and demand for a given asset. If the asset to move close to the top of the envelope then it indicates that there is strong demand for the asset, conversely if the asset hugs the bottom of the trading range then it indicates that there is oversupply of the asset.

Since the Bollinger Bands will nearly always be combined with other indicators when forming a trading system the number of periods used in the evaluation of the standard deviation of the stocks and the moving average will vary. For those without design restrictions a popular choice of the number of time periods is around 20-23.

Requirements

Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

See Also