com.itemanalysis.psychometrics.factoranalysis

Class GPArotation

java.lang.Object

com.itemanalysis.psychometrics.factoranalysis.GPArotation

public class GPArotation
extends java.lang.Object

This class is a translation of the GPArotation package in R. Alternative translations for SAS, SPSS, matlab, Gauss, and Stata are available at http://www.stat.ucla.edu/research/gpa/.

For more information see:

Bernaards, C.A., & Jennrich, R.I. (2005). Gradient Projection Algorithms and Software for Arbitrary
Rotation Criteria in Factor Analysis. Educational and Psychological
Measurement, 65 (5), 676-696.

Constructor Summary

Constructors

Constructor and Description
GPArotation()

Method Summary

Modifier and Type	Method and Description
RotationResults	rotate(org.apache.commons.math3.linear.RealMatrix A, RotationMethod method) Implement rotation using default values.
RotationResults	rotate(org.apache.commons.math3.linear.RealMatrix A, RotationMethod rotationMethod, boolean normalize, int maxIter, double eps) Users should call this method.

Methods inherited from class java.lang.Object

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

Constructor Detail

GPArotation

public GPArotation()

Method Detail

rotate

public RotationResults rotate(org.apache.commons.math3.linear.RealMatrix A,
                              RotationMethod rotationMethod,
                              boolean normalize,
                              int maxIter,
                              double eps)
                       throws org.apache.commons.math3.exception.ConvergenceException

Users should call this method. It will decide whether to use GPForth(org.apache.commons.math3.linear.RealMatrix, boolean, int, double) or GPFoblq(org.apache.commons.math3.linear.RealMatrix, boolean, int, double) )} according to the type of rotation method specified in the method call.

Parameters:

A - a matrix of unrotated, orthogonal factor loadings.

rotationMethod - the type of rotation to conduct.

maxIter - maximum number of iterations (e.g. maxIter = 1000)

eps - convergence criterion (e.g. eps = 1e-5)

Returns:

a matrix of rotated factor loadings.

Throws:

org.apache.commons.math3.exception.ConvergenceException

rotate

public RotationResults rotate(org.apache.commons.math3.linear.RealMatrix A,
                              RotationMethod method)
                       throws org.apache.commons.math3.exception.ConvergenceException

Implement rotation using default values.

Parameters:

A - a matrix of unrotated, orthogonal factor loadings.

method - the type of rotation to conduct.

Returns:

a matrix of rotated factor loadings.

Throws:

org.apache.commons.math3.exception.ConvergenceException