Ase1pl                  Calculates the asymptotic variance for
                        difficulty parameter estimates under the 1pl
                        model
Ase2pl                  Calculates the asymptotic covariance matrix of
                        item parameter estimates under the 2pl model
Ase3pl                  Calculates the asymptotic covariance matrix of
                        item parameter estimates under the 3pl model
AseIrt                  Calculates the asymptotic covariance matrices
                        for item parameters according with the IRT
                        model.
Bound3PlIpr             Takes item parameters from Ipr and forces
                        guessing to lie between 0 and 1
Bound4PlIpr             Takes item parameters from Ipr and forces
                        guessing to lie between 0 and 1
Calculate1plProb        Calculates the item success probability under
                        the 1PL model.
Calculate2plProb        Calculates the item success probability under
                        the 2PL model.
Calculate3plProb        Calculates the item success probability under
                        the 3PL model.
Calculate4plProb        Calculates the item success probability under
                        the 4PL model.
CalculateGrmExp         Calculates the expected item score under the
                        GRM model.
CalculateItemDifferences
                        Calculates the differences between two item
                        option characteristic curves for all options
                        (minus one).
CalculatePcmExp         Calculates the expected item score under the
                        (G)PCM model.
Cdif                    Calculates CDIF index for an item with given
                        item parameters of focal and reference groups.
CheckDiscriminations    Identifies items with nonpositive
                        discrimination
CheckGuessings          Identifies items with guessing outside [0, 1]
CheckUpper              Identifies items with upper asymptote outside
                        [0, 1]
CrossedProbabilities    Calculates the crossed probabilities associated
                        with the numerator and denominator of the
                        odds-ratio under dichotomous IRT models
CutoffIpr               Cut-off points for Ipr generated estimates
DFIT                    Differential Functioning of Items and Tests
                        framework
DeltaMhIrt              Obtains the ETS Delta measure for
                        Mantel-Haneszel DIF statistic effect size.
Dtf                     Calculates DTF index for a set of items with
                        given item parameters of focal and reference
                        groups.
Extract2PLMirt          Extract item discrimination and difficulties
                        and estimate covariance estimates for 2PL items
                        from a fitted mirt object for one or two groups
Extract3PLMirt          Extract item discrimination, difficulties, and
                        guessing parameters and estimate covariance
                        estimates for 3PL items from a fitted mirt
                        object for one or two groups
Extract4PLMirt          Extract item discrimination, difficulties,
                        guessing, and upper asymptote parameters and
                        estimate covariance estimates for 4PL items
                        from a fitted mirt object for one or two groups
ExtractGPCMMirt         Extract item discrimination and difficulties
                        and estimate covariance estimates for GPCM
                        items from a fitted mirt object for one or two
                        groups
ExtractGRMMirt          Extract item discrimination and difficulties
                        and estimate covariance estimates for GRM items
                        from a fitted mirt object for one or two groups
ExtractMirtPars         Extracts the item parameters from a
                        unidimensional mirt model
ExtractRaschMirt        Extract item difficulties and item difficulty
                        variance estimates for Rasch items from a
                        fitted mirt object for one or two groups
Ipr                     Item parameter replication
IprMh                   Mantel Haenszel for Item parameter replication
IprNcdif                NCDIF for Item parameter replication
IprSam                  Signed Area Measure for Item parameter
                        replication
IprUam                  Unsigned Area Measure for Item parameter
                        replication
IrtMh                   Calculates the Mantel-Haenszel theoretical
                        parameter when a dichotomous IRT model holds
Ncdif                   Calculates NCDIF index for an item with given
                        item parameters of focal and reference groups.
PlotNcdif               Plot the item characteristic (expected score)
                        curve for focal and reference groups for the
                        iiItem along with a representation of the focal
                        group density.
ProductProbabilities    Calculates the product of item response
                        probabilities for dichotomous IRT models
SignedArea              Calculates Raju's Signed Area Measure index for
                        an item with given item parameters of focal and
                        reference groups.
UnsignedArea            Calculates Raju's Unsigned Area Measure index
                        for an item with given item parameters of focal
                        and reference groups.
dichotomousItemParameters
                        Sets of focal and reference item parameters
                        from Wright (2011).
polytomousItemParameters
                        Sets of focal and reference item parameters
                        from Raju et al. (2009)
