com.itemanalysis.psychometrics.reliability

Class KR21

java.lang.Object

com.itemanalysis.psychometrics.reliability.AbstractScoreReliability

com.itemanalysis.psychometrics.reliability.KR21

All Implemented Interfaces:

ScoreReliability, java.lang.Comparable<ScoreReliability>

public class KR21
extends AbstractScoreReliability

Author:

J. Patrick Meyer

Field Summary

Fields inherited from class com.itemanalysis.psychometrics.reliability.AbstractScoreReliability

matrix, nItems

Constructor Summary

Constructors

Constructor and Description
KR21(int numberOfItems, double testMean, double testStdDev)
KR21(int numberOfItems, double testMean, double testStdDev, boolean unbiased)

Method Summary

Modifier and Type	Method and Description
ScoreReliabilityType	getType() Type of reliability estimate
double[]	itemDeletedReliability() An array of reliability estimates without the item indexed by the position in the array.
java.lang.String	printItemDeletedSummary(java.util.ArrayList<VariableAttributes> var) A String representation of all item deleted reliability estimates.
java.lang.String	toString()
double	value() Estimates reliability.

Methods inherited from class com.itemanalysis.psychometrics.reliability.AbstractScoreReliability

compareTo, confidenceInterval, confidenceIntervalToString, equals, hashCode, totalVariance

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

KR21

public KR21(int numberOfItems,
            double testMean,
            double testStdDev,
            boolean unbiased)

KR21

public KR21(int numberOfItems,
            double testMean,
            double testStdDev)

Method Detail

getType

public ScoreReliabilityType getType()

Description copied from interface: ScoreReliability

Type of reliability estimate

Returns:

type of reliability estimate.

value

public double value()

Description copied from interface: ScoreReliability

Estimates reliability.

Returns:

estimate of reliability

itemDeletedReliability

public double[] itemDeletedReliability()

Description copied from interface: ScoreReliability

An array of reliability estimates without the item indexed by the position in the array. For example, rel[0] = is the reliability estimate without the item at position 0. Similarly, rel[1] = is the reliability estimate without the item at position 1.

Returns:

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

printItemDeletedSummary

public java.lang.String printItemDeletedSummary(java.util.ArrayList<VariableAttributes> var)

Description copied from interface: ScoreReliability

A String representation of all item deleted reliability estimates.

Parameters:

var - VariableAttributes that provide the variable names.

Returns: