com.itemanalysis.psychometrics.measurement

Class CategoryResponseSummary

java.lang.Object

com.itemanalysis.psychometrics.measurement.CategoryResponseSummary

public class CategoryResponseSummary
extends java.lang.Object

Constructor Summary

Constructors

Constructor and Description
CategoryResponseSummary(VariableName itemName, java.lang.Object categoryID, boolean correctForSpuriousness, DiscriminationType discriminationType)

Method Summary

Modifier and Type	Method and Description
double	getDifficulty()
double	getDindexLowerMean()
double	getDindexUpperMean()
double	getDiscrimination() Returns the discrimination for the response category, which may also be the whole item.
double	getMaximumObservedItemScore()
double	getMinimumObservedItemScore()
double	getStandardDeviation()
void	increment(double itemScore, double testScore) Use this incremental update if the item is continuous or the response is already scored.
void	increment(java.lang.Object response, double testScore) Use this incremental update for each response option.
void	incrementDindex(double itemScore, double testScore, double lowerBound, double upperBound) This method is called when computing teh D-index for the overall item.
void	incrementDindex(java.lang.Object response, double testScore, double lowerBound, double upperBound)

Methods inherited from class java.lang.Object

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

Constructor Detail

CategoryResponseSummary

public CategoryResponseSummary(VariableName itemName,
                               java.lang.Object categoryID,
                               boolean correctForSpuriousness,
                               DiscriminationType discriminationType)

Method Detail

increment

public void increment(java.lang.Object response,
                      double testScore)

Use this incremental update for each response option.

Parameters:

response - the examinee response to an item

testScore - the examinee's test score

increment

public void increment(double itemScore,
                      double testScore)

Use this incremental update if the item is continuous or the response is already scored.

Parameters:

itemScore - an examinee's item score

testScore - an examinee's test score

incrementDindex

public void incrementDindex(java.lang.Object response,
                            double testScore,
                            double lowerBound,
                            double upperBound)

getMinimumObservedItemScore

public double getMinimumObservedItemScore()

getMaximumObservedItemScore

public double getMaximumObservedItemScore()

incrementDindex

public void incrementDindex(double itemScore,
                            double testScore,
                            double lowerBound,
                            double upperBound)

This method is called when computing teh D-index for the overall item.

Parameters:

itemScore - an examinee's item score

testScore - an examinee's summed score

lowerBound - the value at lower pth percentile

upperBound - the value at the 100-pth percentile

getDifficulty

public double getDifficulty()

getStandardDeviation

public double getStandardDeviation()

getDiscrimination

public double getDiscrimination()

Returns the discrimination for the response category, which may also be the whole item.

Returns:

discrimination value

getDindexLowerMean

public double getDindexLowerMean()

getDindexUpperMean

public double getDindexUpperMean()