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Differential item functioning

Differential item functioning (DIF) is a statistical property of a test item that indicates how likely it is for individuals from distinct groups, possessing similar abilities, to respond differently to the item. It manifests when individuals from different groups, with comparable skill levels, do not have an equal likelihood of answering a question…

Procedures for detecting DIF, Statistical software & Considerations

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Overview

Description

Forms

Procedures for detecting DIF

Considerations

Statistical software

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Map overview Semantic statistics

Differential item functioning

Nodes68
Edges67
Triples12
Avg. degree1.97
Density0.029412
Components1

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Important terminology Word statistics

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Important terminology

dif textstyle item groups items test ability group reference response parameter focal may procedure probability individuals statistical procedures differences theta

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
DIF biases may offset each other due to the extensive work required to address itinstance oftest developers sometimes resort to assumptions0.80text
compromising test ethicsinstance oftest developers sometimes resort to assumptions0.80text
perpetuating systemic biases.Common procedures for assessing DIF are Mantel-Haenszel procedureinstance oftest developers sometimes resort to assumptions0.80text
logistic regressioninstance oftest developers sometimes resort to assumptions0.80text
item response theoryinstance oftest developers sometimes resort to assumptions0.80text
the number of males/females or members of ethnic/racial groupsinstance ofinformation about the number of people in each group is typically known0.80text
ethnicity there may be evidence of unequal group sizes such that Whites represent a far larger group sample than each individual ethnic group being representedinstance ofIn some instances0.80text
IRT-Likelihood Ratio testing require the use of anchor itemsinstance ofsome procedures0.80text
socioeconomic statusinstance ofFactors0.80text
cultural differencesinstance ofFactors0.80text
language barriersinstance ofFactors0.80text
and disparities in knowledge access can contribute to nonuniform DIFinstance ofFactors0.80text

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