this study aimed at investigating differential item functioning (dif) on the special english test of the iranian national university entrance exam (inuee). the effect of gender and subject area was taken into account. the study utilized one-parameter irt model with a sample of 36000 students who sat for the inuee special english test in 2004 and/or 2005. the findings confirmed the presence of d...

This research used logistic regression to model item responses from a popular 360-for-development survey. The model used method of survey delivery and rater group to identify items that exhibited differential item functioning (DIF). The methods of survey delivery were pencil-and-paper and online by web page. The rater groups were self, boss, peer, and direct report. The sample consisted of 374 ...

A new diagnostic tool for the identification of differential item functioning (DIF) is proposed. Classical approaches to DIF allow to consider only few subpopulations like ethnic groups when investigating if the solution of items depends on the membership to a subpopulation. We propose an explicit model for differential item functioning that includes a set of variables, containing metric as wel...

A method for analyzing test item responses is proposed to examine differential item functioning (DIF) in multiple-choice items through a combination of the usual notion of DIF, for correct/incorrect responses and information about DIF contained in each of the alternatives. The proposed method uses incomplete latent class models to examine whether DIF is caused by the attractiveness of the alter...

Context is a vague notion with numerous building blocks making language test scores inferences quite convoluted. This study has made use of a model of item responding that has striven to theorize the contextual infrastructure of differential item functioning (DIF) research and help specify the sources of DIF. Two steps were taken in this research: first, to identify DIF by gender grouping via l...

Differential item functioning (DIF) occurs when an item is influenced by a variable irrelevant to the construct of interest. Recent investigations of DIF in the Psychopathy Checklist-Revised (PCL-R) indicated that several PCL-R items demonstrated significant DIF. These findings spurred the current investigation of DIF in a measure of subclinical psychopathy closely tied to the PCL-R, namely a 4...

Differential item functioning (DIF) is when a test item favors or hinders a characteristic exhibited by group members of a test-taking population. DIF analyses are statistical procedures used to determine to what extent the content of an item affects the item endorsement of sub-groups of test-takers. If DIF is found for many items on the test, the final test scores do not represent the same mea...

This study aimed at investigating differential item functioning (DIF) on the Special English Test of the Iranian National University Entrance Exam (INUEE). The effect of gender and subject area was taken into account. The study utilized one-parameter IRT model with a sample of 36000 students who sat for the INUEE Special English Test in 2004 and/or 2005. The findings confirmed the presence of D...

This study uses simulated data to compare two methods of calculating Differential Test Functioning (DTF): Raju’s DFIT, a parametric method that measures the squared difference between two Test Characteristic Curves (Raju, van der Linden & Fleer, 1995), and a variance estimator based on the Mantel-Haenszel/Liu-Agresti method, a non-parametric method enabled in the DIFAS (Penfield, 2005) program....

Tujuan penelitian ini untuk menganalisis apakah butir-butir pada skala sikap moderasi beragama siswa mengandung bias gender. Menggunakan pendekatan kuantitatif metode survei, mengambil populasi sebanyak 54.383 dengan sampel 4.188 SMA/MA di Provinsi Kepulauan Bangka Belitung. Metode pengumpulan data menggunakan instrumen yang telah memenuhi kriteria properti psikometri indeks item reliability se...