com.itemanalysis.psychometrics.factoranalysis

Class WeightedLeastSquaresMethod

java.lang.Object

com.itemanalysis.psychometrics.factoranalysis.AbstractFactorMethod

com.itemanalysis.psychometrics.factoranalysis.WeightedLeastSquaresMethod

All Implemented Interfaces:

FactorMethod

public class WeightedLeastSquaresMethod
extends AbstractFactorMethod

Field Summary

Fields inherited from class com.itemanalysis.psychometrics.factoranalysis.AbstractFactorMethod

communality, factorLoading, nFactors, nParam, nVariables, proportionOfExplainedVariance, proportionOfVariance, R, rotationMethod, sumsOfSquares, uniqueness, variableNames

Constructor Summary

Constructors

Constructor and Description
WeightedLeastSquaresMethod(org.apache.commons.math3.linear.RealMatrix R, int nFactors, RotationMethod rotationMethod)

Method Summary

Modifier and Type	Method and Description
double	estimateParameters() A method for estimating parameters.
double[]	getStartValues()

Methods inherited from class com.itemanalysis.psychometrics.factoranalysis.AbstractFactorMethod

getCommunalityAt, getFactorLoading, getFactorLoadingAt, getLoadingsForFactorAt, getLowerBounds, getProportionOfExplainedVarianceAt, getProportionOfVarianceAt, getSumsOfSquaresAt, getUniquenessAt, getUpperBounds, getVariableNameAt, setVariableNameAt, setVariableNameAt

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

WeightedLeastSquaresMethod

public WeightedLeastSquaresMethod(org.apache.commons.math3.linear.RealMatrix R,
                                  int nFactors,
                                  RotationMethod rotationMethod)

Method Detail

estimateParameters

public double estimateParameters()

Description copied from interface: FactorMethod

A method for estimating parameters. The returned value is the value of the criterion function at the estimated values. It should be the smallest possible value. This value is returned for display in the output.

Returns:

value of the criterion function at the estimated values

getStartValues

public double[] getStartValues()