Differential Functioning of Items and Tests
Extract item discrimination and difficulties and estimate covariance e...
Extracts the item parameters from a unidimensional mirt model
Extract item difficulties and item difficulty variance estimates for R...
Item parameter replication
Mantel Haenszel for Item parameter replication
Calculates the asymptotic variance for difficulty parameter estimates ...
Calculates the asymptotic covariance matrix of item parameter estimate...
Calculates the asymptotic covariance matrix of item parameter estimate...
Calculates the asymptotic covariance matrices for item parameters acco...
Takes item parameters from Ipr and forces guessing to lie between 0 an...
Takes item parameters from Ipr and forces guessing to lie between 0 an...
Calculates the item success probability under the 1PL model.
Calculates the item success probability under the 2PL model.
Calculates the item success probability under the 3PL model.
Calculates the item success probability under the 4PL model.
Calculates the expected item score under the GRM model.
Calculates the differences between two item option characteristic curv...
Calculates the expected item score under the (G)PCM model.
Calculates CDIF index for an item with given item parameters of focal ...
Identifies items with nonpositive discrimination
Identifies items with guessing outside [0, 1]
Identifies items with upper asymptote outside [0, 1]
Calculates the crossed probabilities associated with the numerator and...
Cut-off points for Ipr generated estimates
Obtains the ETS Delta measure for Mantel-Haneszel DIF statistic effect...
Differential Functioning of Items and Tests framework
Calculates DTF index for a set of items with given item parameters of ...
Extract item discrimination and difficulties and estimate covariance e...
Extract item discrimination, difficulties, and guessing parameters and...
Extract item discrimination, difficulties, guessing, and upper asympto...
Extract item discrimination and difficulties and estimate covariance e...
NCDIF for Item parameter replication
Signed Area Measure for Item parameter replication
Unsigned Area Measure for Item parameter replication
Calculates the Mantel-Haenszel theoretical parameter when a dichotomou...
Calculates NCDIF index for an item with given item parameters of focal...
Plot the item characteristic (expected score) curve for focal and refe...
Calculates the product of item response probabilities for dichotomous ...
Calculates Raju's Signed Area Measure index for an item with given ite...
Calculates Raju's Unsigned Area Measure index for an item with given i...
A set of functions to perform Raju, van der Linden and Fleer's (1995, <doi:10.1177/014662169501900405>) Differential Functioning of Items and Tests (DFIT) analyses. It includes functions to use the Monte Carlo Item Parameter Replication approach (Oshima, Raju, & Nanda, 2006, <doi:10.1111/j.1745-3984.2006.00001.x>) for obtaining the associated statistical significance tests cut-off points. They may also be used for a priori and post-hoc power calculations (Cervantes, 2017, <doi:10.18637/jss.v076.i05>).