MeasuresWeightedVariance Method (Double, Int32, Double, Boolean)

Calculates the matrix Variance vector.

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

Syntax

public static double[] WeightedVariance(
	this double[,] matrix,
	int[] weights,
	double[] means,
	bool unbiased
)

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

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Parameters

matrix: Type: SystemDouble
A matrix whose variances will be calculated.
weights: Type: SystemInt32
The number of times each sample should be repeated.
means: Type: SystemDouble
The mean vector containing already calculated means for each column of the matrix.
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
Returns a vector containing the variances of the given matrix.

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