﻿ LowerBollingerBands(Series,ElementValue,Double,Int32) Method
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 dotnetCHARTING Namespace > FinancialEngine Class > LowerBollingerBands Method : LowerBollingerBands(Series,ElementValue,Double,Int32) Method

s
A series where the first term correspond the latest periods price 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.
elementValue
Specifies the particular element value (for example High, Low, Close or Open of the financial time series) which will be considered within this indicator evaluation. In particular, if you wish to use the element value high then you should pass the parameter High. In a similarly fashion if you wish to use the low, close or open, then you should pass the parameter Low, Close, Open, respectively.
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.
Evaluates the position of the Lower Bollinger Band for a given standard deviation level.

# Syntax

Visual Basic (Declaration)
```Public Overloads Shared Function LowerBollingerBands( _
ByVal s As Series, _
ByVal elementValue As ElementValue, _
ByVal standardDeviationLevel As Double, _
ByVal lengthOfMA As Integer _
) As Series```
Visual Basic (Usage)Copy Code
``````Dim s As Series
Dim elementValue As ElementValue
Dim standardDeviationLevel As Double
Dim lengthOfMA As Integer
Dim value As Series

value = FinancialEngine.LowerBollingerBands(s, elementValue, standardDeviationLevel, lengthOfMA)``````
C#
```public static Series LowerBollingerBands(
Series s,
ElementValue elementValue,
double standardDeviationLevel,
int lengthOfMA
)```

#### Parameters

s
A series where the first term correspond the latest periods price 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.
elementValue
Specifies the particular element value (for example High, Low, Close or Open of the financial time series) which will be considered within this indicator evaluation. In particular, if you wish to use the element value high then you should pass the parameter High. In a similarly fashion if you wish to use the low, close or open, then you should pass the parameter Low, Close, Open, respectively.
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.

# Exceptions

ExceptionDescription
ArgumentExceptionThrown when the series in empty or the number of standard deviations considered (i.e. the parameters standardDeviationLevel) is not positive number.

# Remarks

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.