com.itemanalysis.psychometrics.polycor

Class PolyserialPlugin

java.lang.Object

com.itemanalysis.psychometrics.polycor.PolyserialPlugin

public class PolyserialPlugin
extends java.lang.Object

This class computes the polyserial correlation between a continuous X variable and an ordered categorical Y variable. It is consistent with the polyserial function from the polycor package in R.

Author:

J. Patrick Meyer

Constructor Summary

Constructors

Constructor and Description
PolyserialPlugin()

Method Summary

Modifier and Type	Method and Description
double[]	getThresholds()
void	increment(double x, int y)
double	spuriousCorrectedPearsonCorrelation() Correct pearson correlation for spuriousness due to including the studied item score Y in the computation of X values.
double	spuriousCorrectedValue() Correct polyserial correlation for spuriousness due to including the studied item score Y in the computation of X values.
double	value()

Methods inherited from class java.lang.Object

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

Constructor Detail

PolyserialPlugin

public PolyserialPlugin()

Method Detail

increment

public void increment(double x,
                      int y)

getThresholds

public double[] getThresholds()

value

public double value()

spuriousCorrectedPearsonCorrelation

public double spuriousCorrectedPearsonCorrelation()

Correct pearson correlation for spuriousness due to including the studied item score Y in the computation of X values. This method is used for the polyserial correlation in an item analysis.

Returns:

correlation corrected for spuriousness

spuriousCorrectedValue

public double spuriousCorrectedValue()

Correct polyserial correlation for spuriousness due to including the studied item score Y in the computation of X values. This method is used for the polyserial correlation in an item analysis.

Returns:

correlation corrected for spuriousness