com.itemanalysis.psychometrics.irt.model

Interface ItemResponseModelWithGradient

All Superinterfaces:

ItemResponseModel

public interface ItemResponseModelWithGradient
extends ItemResponseModel

Method Summary

Modifier and Type	Method and Description
double[]	firstDerivative(double theta) Deprecated.
double[][]	hessian(double theta) Deprecated.

Methods inherited from interface com.itemanalysis.psychometrics.irt.model.ItemResponseModel

acceptAllProposalValues, addPriorsToLogLikelihood, addPriorsToLogLikelihoodGradient, cumulativeProbability, derivTheta, expectedValue, getDifficulty, getDifficultyStdError, getDiscrimination, getDiscriminationStdError, getGroupId, getGuessing, getGuessingStdError, getItemFitStatistic, getItemParameterArray, getItemScoring, getMaxScoreWeight, getMinScoreWeight, getName, getNcat, getNumberOfEstimatedParameters, getNumberOfParameters, getProposalDifficulty, getScalingConstant, getScoreWeights, getSlipping, getSlippingStdError, getStepParameters, getStepStdError, getThresholdParameters, getThresholdStdError, getType, gradient, gradient, incrementMeanMean, incrementMeanSigma, isFixed, itemInformationAt, nonZeroPrior, probability, probability, scale, setDifficulty, setDifficultyPrior, setDifficultyStdError, setDiscrimination, setDiscriminationPrior, setDiscriminationStdError, setFixed, setGroupId, setGuessing, setGuessingPrior, setGuessingStdError, setItemFitStatistic, setItemScoring, setName, setProposalDifficulty, setProposalDiscrimination, setProposalGuessing, setProposalSlipping, setProposalStepParameters, setProposalThresholds, setScoreWeights, setSlipping, setSlippingPrior, setSlippingStdError, setStandardErrors, setStepParameters, setStepPriorAt, setStepStdError, setThresholdParameters, setThresholdStdError, tSharpExpectedValue, tSharpProbability, tStarExpectedValue, tStarProbability

Method Detail

firstDerivative

@Deprecated
double[] firstDerivative(double theta)

Deprecated.

Derivative from Mathematica. First derivative with respect to person ability.

Parameters:

theta - person ability value.

Returns:

first derivative wrt theta.

hessian

@Deprecated
double[][] hessian(double theta)

Deprecated.

Hessian or matrix of second derivatives.

Parameters:

theta - person ability value.

Returns:

a two-way array containing teh Hessian matrix values.