com.itemanalysis.psychometrics.kernel

Class LeastSquaresCrossValidation

java.lang.Object

com.itemanalysis.psychometrics.kernel.LeastSquaresCrossValidation

All Implemented Interfaces:

Bandwidth, org.apache.commons.math3.analysis.UnivariateFunction

public class LeastSquaresCrossValidation
extends java.lang.Object
implements Bandwidth, org.apache.commons.math3.analysis.UnivariateFunction

A class for computing the bandwidth by least squares cross validation kernel. This clas is still in development. It needs more work and testing. Not ready for use.

Constructor Summary

Constructors

Constructor and Description
LeastSquaresCrossValidation(double[] x)

Method Summary

Modifier and Type	Method and Description
double	cvSum(double bandwidth)
double[]	density(double bandwidth)
double[]	density(double bandwidth, int index)
double	getAdjustmentFactor() The bandwidth is multiplied by teh adjustment factor to increase or decrease smoothing.
double	leaveOutDensityAt(double bandwidth, int index)
double	squaredIntegral()
double	value() The value of teh bandwidth
double	value(double h)

Methods inherited from class java.lang.Object

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

Constructor Detail

LeastSquaresCrossValidation

public LeastSquaresCrossValidation(double[] x)
                            throws java.lang.Exception

Throws:

java.lang.Exception

Method Detail

density

public double[] density(double bandwidth)

density

public double[] density(double bandwidth,
                        int index)

leaveOutDensityAt

public double leaveOutDensityAt(double bandwidth,
                                int index)

cvSum

public double cvSum(double bandwidth)

squaredIntegral

public double squaredIntegral()

value

public double value(double h)

Specified by:

value in interface org.apache.commons.math3.analysis.UnivariateFunction

value

public double value()

Description copied from interface: Bandwidth

The value of teh bandwidth

Specified by:

value in interface Bandwidth

Returns:

getAdjustmentFactor

public double getAdjustmentFactor()

Description copied from interface: Bandwidth

The bandwidth is multiplied by teh adjustment factor to increase or decrease smoothing. This number must be greater than 0.

Specified by:

getAdjustmentFactor in interface Bandwidth

Returns:

adjustment factor