com.itemanalysis.psychometrics.polycor

Class PolychoricTwoStep.TwoStepLikelihoodFunction

java.lang.Object

com.itemanalysis.psychometrics.polycor.PolychoricTwoStep.TwoStepLikelihoodFunction

All Implemented Interfaces:

Fmin_methods

Enclosing class:

PolychoricTwoStep

public class PolychoricTwoStep.TwoStepLikelihoodFunction
extends java.lang.Object
implements Fmin_methods

Likelihood function for the two-step approximation. Thresholds are obtained from the inverse cumulative normal distribution, and teh correlation is found by Brent's method.

Constructor Summary

Constructors

Constructor and Description
TwoStepLikelihoodFunction(double[] rc, double[] cc)

Method Summary

Modifier and Type	Method and Description
double	f_to_minimize(double x)

Methods inherited from class java.lang.Object

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

Constructor Detail

TwoStepLikelihoodFunction

public TwoStepLikelihoodFunction(double[] rc,
                                 double[] cc)

Method Detail

f_to_minimize

public double f_to_minimize(double x)

Specified by:

f_to_minimize in interface Fmin_methods