NMathFunctionsWeightedVariance(IDFColumn, IDFColumn, Boolean) Method

Calculates the weighted variance of the given data.

Namespace: CenterSpace.NMath.Core
Assembly: NMath (in NMath.dll) Version: 7.4

Syntax

public static double WeightedVariance(
	IDFColumn data,
	IDFColumn weights,
	bool normalizeWeights
)

Public Shared Function WeightedVariance ( 
	data As IDFColumn,
	weights As IDFColumn,
	normalizeWeights As Boolean
) As Double

public:
static double WeightedVariance(
	IDFColumn^ data, 
	IDFColumn^ weights, 
	bool normalizeWeights
)

static member WeightedVariance : 
        data : IDFColumn * 
        weights : IDFColumn * 
        normalizeWeights : bool -> float

data IDFColumn: The data.
weights IDFColumn: The weights.
normalizeWeights Boolean: If true, normalize the weights to sum to the length of the data column. If the weights represent sampling (reliability) weights, normalizing is usually appropriate. But if the weights represent frequency counts, which in effect expand the data column by these counts, do not normalize.

Double
The weighted variance.

Exceptions

Exception	Condition
MismatchedSizeException	Thrown if data and weights do not have the same length.
NMathFormatConvertException	Thrown if data or weights are not numeric.