com.itemanalysis.psychometrics.scaling

Class PercentileRank

java.lang.Object

com.itemanalysis.psychometrics.scaling.PercentileRank

public class PercentileRank
extends java.lang.Object

Author:

J. Patrick Meyer

Constructor Summary

Constructors

Constructor and Description
PercentileRank()
PercentileRank(java.lang.Integer min, java.lang.Integer max)

Method Summary

Modifier and Type	Method and Description
void	addAllValues(double[] x)
void	addAllValues(int[] x)
void	addValue(java.lang.Double score) All doubles are converted to integers see page 44, Kolen and Brennan(2004).
void	addValue(java.lang.Integer score)
void	clear()
void	createLookupTable() Creates a TreeMap lookup table of percentile ranks.
double[][]	evaluate() For r number of score levels between min and max, inclusive, this method returns a r x 2 array with integer based scores in first column and percentile ranks in the second column.
double[][]	evaluate(double[] score)
double[][]	evaluate(int[] score)
long	getCount(java.lang.Integer score)
double	getPercentileRankAt(int value)
int	getSize()
java.lang.String	toString()
java.util.Iterator<java.lang.Integer>	valueIterator()

Methods inherited from class java.lang.Object

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

Constructor Detail

PercentileRank

public PercentileRank(java.lang.Integer min,
                      java.lang.Integer max)

PercentileRank

public PercentileRank()

Method Detail

getSize

public int getSize()

addValue

public void addValue(java.lang.Integer score)

addValue

public void addValue(java.lang.Double score)

All doubles are converted to integers see page 44, Kolen and Brennan(2004).

Parameters:

score - a test score.

addAllValues

public void addAllValues(int[] x)

addAllValues

public void addAllValues(double[] x)

clear

public void clear()

getCount

public long getCount(java.lang.Integer score)

createLookupTable

public void createLookupTable()

Creates a TreeMap lookup table of percentile ranks. The key is a score level and the rho is a percentile rank. This method is useful when finding percentile ranks that correspond to an examinee's raw score. After calling this method, individual elements in the TreeMap can be accessed with getPercentileRankAt(int rho) or valueIterator().

evaluate

public double[][] evaluate()

For r number of score levels between min and max, inclusive, this method returns a r x 2 array with integer based scores in first column and percentile ranks in the second column. This method is useful when only the raw scores and corresponding percentile ranks are needed.

Returns:

two-way array of raw scores scores and percentile ranks.

evaluate

public double[][] evaluate(int[] score)

evaluate

public double[][] evaluate(double[] score)

getPercentileRankAt

public double getPercentileRankAt(int value)

valueIterator

public java.util.Iterator<java.lang.Integer> valueIterator()

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object