DFIT: Differential Functioning of Items and Tests

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A set of functions to perform Raju, van der Linden and Fleer's (1995) Differential Functioning of Items and Tests (DFIT) analyses. It includes functions to use the Monte Carlo Item Parameter Replication approach (Oshima, Raju, & Nanda, 2006) for obtaining the associated statistical significance tests cut-off points. They may also be used for a priori and post-hoc power calculations.

Author
Victor H. Cervantes <vcervantes@icfes.gov.co, vhcervantesb@unal.edu.co>
Date of publication
2015-02-01 09:04:50
Maintainer
Victor H. Cervantes <vhcervantesb@unal.edu.co>
License
GPL (>= 2)
Version
1.0-2

View on CRAN

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...

Files in this package

DFIT
DFIT/inst
DFIT/inst/CITATION
DFIT/NAMESPACE
DFIT/demo
DFIT/demo/RajuAreas.R
DFIT/demo/IPR.R
DFIT/demo/MantelHaenszel.R
DFIT/demo/IRTSE.R
DFIT/demo/NCDIF.R
DFIT/demo/powerExample.R
DFIT/demo/00Index
DFIT/NEWS
DFIT/data
DFIT/data/dichotomousItemParameters.rda
DFIT/data/polytomousItemParameters.rda
DFIT/R
DFIT/R/RajuAreas.R
DFIT/R/IPR.R
DFIT/R/MantelHaenszel.R
DFIT/R/IRTSE.R
DFIT/R/NCDIF.R
DFIT/R/data.R
DFIT/R/DFIT.R
DFIT/MD5
DFIT/README
DFIT/DESCRIPTION
DFIT/man
DFIT/man/UnsignedArea.Rd
DFIT/man/Calculate2plProb.Rd
DFIT/man/Calculate3plProb.Rd
DFIT/man/Ase1pl.Rd
DFIT/man/Ase2pl.Rd
DFIT/man/CalculatePcmExp.Rd
DFIT/man/Calculate1plProb.Rd
DFIT/man/DFIT.Rd
DFIT/man/IprSam.Rd
DFIT/man/CalculateItemDifferences.Rd
DFIT/man/Ipr.Rd
DFIT/man/IprMh.Rd
DFIT/man/Ase3pl.Rd
DFIT/man/dichotomousItemParameters.Rd
DFIT/man/DeltaMhIrt.Rd
DFIT/man/IrtMh.Rd
DFIT/man/CrossedProbabilities.Rd
DFIT/man/ProductProbabilities.Rd
DFIT/man/IprUam.Rd
DFIT/man/SignedArea.Rd
DFIT/man/AseIrt.Rd
DFIT/man/PlotNcdif.Rd
DFIT/man/CutoffIpr.Rd
DFIT/man/polytomousItemParameters.Rd
DFIT/man/CalculateGrmExp.Rd
DFIT/man/Bound3PlIpr.Rd
DFIT/man/Dtf.Rd
DFIT/man/Ncdif.Rd
DFIT/man/Cdif.Rd
DFIT/man/IprNcdif.Rd