MeasuresWeightedVariance Method (Double, Int32, Double, Boolean)

Computes the weighted Variance of the given values.

Namespace: Accord.Statistics
Assembly: Accord.Math (in Accord.Math.dll) Version: 3.8.0

Syntax

public static double WeightedVariance(
	this double[] values,
	int[] weights,
	double mean,
	bool unbiased
)

<ExtensionAttribute>
Public Shared Function WeightedVariance ( 
	values As Double(),
	weights As Integer(),
	mean As Double,
	unbiased As Boolean
) As Double

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Parameters

values: Type: SystemDouble
A number array containing the vector members.
weights: Type: SystemInt32
A vector containing how many times each element in repeats itself in the non-weighted data.
mean: Type: SystemDouble
The mean of the array, if already known.
unbiased: Type: SystemBoolean
Pass true to compute the sample variance; or pass false to compute the population variance. For integers weights , the bias correction is equivalent to the non-weighted case. For fractional weights, the variance bias cannot be completely eliminated.

Return Value

Type: Double
The variance of the given data.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type . When you use instance method syntax to call this method, omit the first parameter. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).

Reference

Measures Class

WeightedVariance Overload

Accord.Statistics Namespace