Click or drag to resize
Accord.NET (logo)

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
public static double[] WeightedVariance(
	this double[][] matrix,
	int[] weights,
	double[] means,
	bool unbiased
Request Example View Source


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