Visual Basic (Declaration)  

Public Overloads Shared Function LowerBollingerBands( _ ByVal seriesName As String, _ ByVal s As Series, _ ByVal standardDeviationLevel As Double, _ ByVal lengthOfMA As Integer _ ) As Series 
Visual Basic (Usage)  Copy Code 


C#  

public static Series LowerBollingerBands( string seriesName, Series s, double standardDeviationLevel, int lengthOfMA ) 
Parameters
 seriesName
 The name of the series which will be displayed on the chart, i.e. its label.
 s
 A series where the first term correspond the latest periods values and the previous element is the value of the element before that and so on... The length of this series is equal to the number of periods used in the evaluation of the standard deviation and the moving average.
 standardDeviationLevel
 The number of standard deviation 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.
Return Value
A series where the first term corresponds to the value of the Upper Bollinger Band for the latest periods, the second terms to the previous period and so on.Exception  Description 

ArgumentException  Thrown when the series in empty or the number of standard deviations considered (i.e. the parameters standardDeviationLevel) is not positive number. 
Please note that by standard deviation level we not only refer to the number of standard
deviations shifts away from the moving average at which the Lower Bollinger Band is drawn
but also the number of time series points which are used in the evaluation of the standard
deviation and the moving average.