org.activemath.studentmodel2.simulation
Class DifficultyMapper

java.lang.Object
  org.activemath.studentmodel2.simulation.DifficultyMapper

public class DifficultyMapper
extends Object

This class maps LeAM difficulties to [0,1] for use in e.g. IRT

Field Summary

protected boolean

useXLMStyleDifficulty

Constructor Summary

DifficultyMapper()

Method Summary

List	doIRTDifficultyMapping(double irtDifficulty) Sets the parameters difficulty and competencyLevel according to the IRT style difficulty.
List	doXLMDifficultyMapping(double irtDifficulty) Sets the parameters difficulty and competencyLevel according to the XLM style difficulty.
static DifficultyMapper	getInstance() Get an Instance of the mapper
double	getNextExerciseDifficulty(double mastery) Get the difficulty for the next exercise according to the current mastery
double	getNormalizedDifficulty(Difficulty difficulty, CompetencyLevel competencyLevel) Get a normalized difficulty value given a CompetencyLevel and a Difficulty of an exercise.
double	getXLMNormDifficulty(Difficulty difficulty, CompetencyLevel competencyLevel)
boolean	isUseXLMStyleDifficulty()
void	setUseXLMStyleDifficulty(boolean useXLMStyleDifficulty)

Methods inherited from class java.lang.Object

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

Field Detail

useXLMStyleDifficulty

protected boolean useXLMStyleDifficulty

Constructor Detail

DifficultyMapper

public DifficultyMapper()

Method Detail

getInstance

public static DifficultyMapper getInstance()

Get an Instance of the mapper

getNormalizedDifficulty

public double getNormalizedDifficulty(Difficulty difficulty,
                                      CompetencyLevel competencyLevel)

Get a normalized difficulty value given a CompetencyLevel and a Difficulty of an exercise.

Parameters:

difficulty - - the difficulty of an exercise

competencyLevel - - the competencyLevel of an execrise

Returns:

- A normalized value of the difficulty in [0,100]

getXLMNormDifficulty

public double getXLMNormDifficulty(Difficulty difficulty,
                                   CompetencyLevel competencyLevel)

doIRTDifficultyMapping

public List doIRTDifficultyMapping(double irtDifficulty)

Sets the parameters difficulty and competencyLevel according to the IRT style difficulty.

Parameters:

irtDifficulty - - IRT style difficulty

Returns:

List with first obj is Difficulty and second is CompetencyLevel

doXLMDifficultyMapping

public List doXLMDifficultyMapping(double irtDifficulty)

Sets the parameters difficulty and competencyLevel according to the XLM style difficulty.

Parameters:

irtDifficulty - - IRT style difficulty

Returns:

List with first obj is Difficulty and second is CompetencyLevel

getNextExerciseDifficulty

public double getNextExerciseDifficulty(double mastery)

Get the difficulty for the next exercise according to the current mastery

Parameters:

mastery - - the mastery of the simulee

Returns:

The difficulty of the next exercise

isUseXLMStyleDifficulty

public boolean isUseXLMStyleDifficulty()

Returns:

the useXLMStyleDifficulty

setUseXLMStyleDifficulty

public void setUseXLMStyleDifficulty(boolean useXLMStyleDifficulty)

Parameters:

useXLMStyleDifficulty - the useXLMStyleDifficulty to set