﻿ WeightedMovingAverage(String,Series,Series,Int32) Method
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 dotnetCHARTING Namespace > StatisticalEngine Class > WeightedMovingAverage Method : WeightedMovingAverage(String,Series,Series,Int32) Method

seriesName
The name of the series which will be displayed on the chart, i.e. its label.
s
An statistical series
weightSeries
A series of doubles which assigns weights to the k-th previous historical values for the given period on which the moving average is being evaluated. Here k is just the length of the weights array given.
lengthOfMA
The number of periods over which the weighted moving average is evaluated.
Evaluate the Weighted Moving Average(WMA) where the weights associated to all the elements of the historical values are given and the WMA is evaluated for all periods for which there is sufficient historical data.

# Syntax

Visual Basic (Declaration)
```Public Overloads Shared Function WeightedMovingAverage( _
ByVal seriesName As String, _
ByVal s As Series, _
ByVal weightSeries As Series, _
ByVal lengthOfMA As Integer _
) As Series```
Visual Basic (Usage)Copy Code
``````Dim seriesName As String
Dim s As Series
Dim weightSeries As Series
Dim lengthOfMA As Integer
Dim value As Series

value = StatisticalEngine.WeightedMovingAverage(seriesName, s, weightSeries, lengthOfMA)``````
C#
```public static Series WeightedMovingAverage(
string seriesName,
Series s,
Series weightSeries,
int lengthOfMA
)```

#### Parameters

seriesName
The name of the series which will be displayed on the chart, i.e. its label.
s
An statistical series
weightSeries
A series of doubles which assigns weights to the k-th previous historical values for the given period on which the moving average is being evaluated. Here k is just the length of the weights array given.
lengthOfMA
The number of periods over which the weighted moving average is evaluated.

#### Return Value

A series where the first term is the value of the moving average corresponding of the latest period, the second term is the value for the previous period and so on.

# Exceptions

ExceptionDescription
ArgumentExceptionThrown if the length of the weightsSeries and s differ or if either series is empty.

# Remarks

That is, the weights are fixed for all given historical values and the window of length `lengthOfMA` over which the GMA is evaluated is shifted along the series.

### Application

Generally speaking the WMA where the weights are all set and the window over which GMA is evaluated is shifted is used when you wish to give emphasis to particular dates.

Note: The length of the `weights` array must equal or be greater than the length of the `historicalPrices` series. If it's greater than we ignore the supplementary values.