DFIT: Differential Functioning of Items and Tests

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).

AuthorVictor H. Cervantes <vhcervantesb@unal.edu.co>
Date of publication2017-01-06 01:20:43
MaintainerVictor H. Cervantes <vhcervantesb@unal.edu.co>
LicenseGPL (>= 2)
Version1.0-3

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Man pages

Ase1pl: Calculates the asymptotic variance for difficulty parameter...

Ase2pl: Calculates the asymptotic covariance matrix of item parameter...

Ase3pl: Calculates the asymptotic covariance matrix of item parameter...

AseIrt: Calculates the asymptotic covariance matrices for item...

Bound3PlIpr: Takes item parameters frp, Ipr and forces guessing to lie...

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.

CalculateGrmExp: Calculates the expected item score under the GRM model.

CalculateItemDifferences: Calculates the differences between two item option...

CalculatePcmExp: Calculates the expected item score under the (G)PCM model.

Cdif: Calculates CDIF index for an item with given item parameters...

CrossedProbabilities: Calculates the crossed probabilities associated with the...

CutoffIpr: Cut-off points for Ipr generated estimates

DeltaMhIrt: Obtains the ETS Delta measure for Mantel-Haneszel DIF...

DFIT: Differential Functioning of Items and Tests framework

dichotomousItemParameters: Sets of focal and reference item parameters from Wright...

Dtf: Calculates DTF index for a set of items with given item...

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...

Ncdif: Calculates NCDIF index for an item with given item parameters...

PlotNcdif: Plot the item characteristic (expected score) curve for focal...

polytomousItemParameters: Sets of focal and reference item parameters from Raju et al....

ProductProbabilities: Calculates the product of item response probabilities for...

SignedArea: Calculates Raju's Signed Area Measure index for an item with...

UnsignedArea: Calculates Raju's Unsigned Area Measure index for an item...

Questions? Problems? Suggestions? or email at ian@mutexlabs.com.

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