﻿ ExponentiallyWeightedMovingAverage(Series,Double,Int32) Method
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 dotnetCHARTING Namespace > StatisticalEngine Class > ExponentiallyWeightedMovingAverage Method : ExponentiallyWeightedMovingAverage(Series,Double,Int32) Method

s
A statistical series.
smoothingFactor
The number between 0 and 1 which is known as a smoothing factor. The closer the value is to zero the more influence more resent measurements will have on the EWMA.
lengthOfMA
The number of periods over which the moving average is evaluated for each period.
Evaluates the (`x`-day) Exponentially Weighted Moving Average (EWMA) of a time series provided where `x` is the length of the time series array which is provided as a parameter, for all periods for which sufficient data is provided.

# Syntax

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

value = StatisticalEngine.ExponentiallyWeightedMovingAverage(s, smoothingFactor, lengthOfMA)``````
C#
```public static Series ExponentiallyWeightedMovingAverage(
Series s,
double smoothingFactor,
int lengthOfMA
)```

#### Parameters

s
A statistical series.
smoothingFactor
The number between 0 and 1 which is known as a smoothing factor. The closer the value is to zero the more influence more resent measurements will have on the EWMA.
lengthOfMA
The number of periods over which the moving average is evaluated for each period.

#### Return Value

A series where the first term is the EWMA for the most recent period, the second term is the EWMA for the previous period and so on.

# Exceptions

ExceptionDescription
ArgumentExceptionThrown if the Series is empty or if the value given for the smoothing factor lies outside the closed range [0,1].

# See Also

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