The Analysis of Dimensionality, Testlet Effect and Differential Item Functioning and Impact in Testlet-Based Tests

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AHMADI DEH QUTBUDDINI MOHAMMAD; KHODAIE EBRAHIM; FARZAD VALIOLLAH; MOGHADAM ZADEH ALI; KABIRI MASOUD

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Journal: JOURNAL OF EDUCATIONAL MEASUREMENT AND EVALUATION STUDIES Year:2019 | Volume:8 | Issue:24 Page(s): 27-55

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Title

The Analysis of Dimensionality, Testlet Effect and Differential Item Functioning and Impact in Testlet-Based Tests

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Keywords

Graded response modelQ1

bi-factor modelQ1

dimensionalityQ1

differential item functioningQ1

Testlet-based testsQ1

Abstract

The present study was conducted to investigate the impact of monolinguality-bilinguality of Iranian students on dimensionality, local item dependence and differential item functioning and impact of questions included in the passages of PIRLS (2011). The dimensionality was analyzed through comparing the one-dimensional Graded response model and the multidimensional bi-factor item-response theory model. Next, the local item dependence and impact was analyzed using the two-level bi-factor model and, finally, the differential item functioning was examined using a multiple-group bi-factor model used by Cai et al. (2011). The results of the dimensionality showed that the bi-factor model better fitted to the data than the Graded response model. Furthermore, it was found that the local item dependence between two literal trait questions caused deviation from the one-dimensionality and that the linguistic difference could explain a majority of its variance. The Testlet results also showed that the average estimation of monolinguals’ abilities was higher than bilinguals’ abilities. Besides, it was indicated that items embedded with uniform differential item functioning were more difficult for monolinguals than bilinguals but monolinguals outperformed bilinguals in multiple choice items embedded with non-uniform differential item functioning. Overall, the results showed that the traits related to the two literal Testlet were differently perceived among monolingual and bilingual students and local item dependence was more evident among bilinguals than monolinguals. Also, the results indicated a difference between the performance of monolingual and bilingual students in the mixed items format.

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APA: Copy

AHMADI DEH QUTBUDDINI, MOHAMMAD, KHODAIE, EBRAHIM, FARZAD, VALIOLLAH, MOGHADAM ZADEH, ALI, & KABIRI, MASOUD. (2019). The Analysis of Dimensionality, Testlet Effect and Differential Item Functioning and Impact in Testlet-Based Tests. JOURNAL OF EDUCATIONAL MEASUREMENT AND EVALUATION STUDIES, 8(24 ), 27-55. SID. https://sid.ir/paper/371960/en

Vancouver: Copy

AHMADI DEH QUTBUDDINI MOHAMMAD, KHODAIE EBRAHIM, FARZAD VALIOLLAH, MOGHADAM ZADEH ALI, KABIRI MASOUD. The Analysis of Dimensionality, Testlet Effect and Differential Item Functioning and Impact in Testlet-Based Tests. JOURNAL OF EDUCATIONAL MEASUREMENT AND EVALUATION STUDIES[Internet]. 2019;8(24 ):27-55. Available from: https://sid.ir/paper/371960/en

IEEE: Copy

MOHAMMAD AHMADI DEH QUTBUDDINI, EBRAHIM KHODAIE, VALIOLLAH FARZAD, ALI MOGHADAM ZADEH, and MASOUD KABIRI, “The Analysis of Dimensionality, Testlet Effect and Differential Item Functioning and Impact in Testlet-Based Tests,” JOURNAL OF EDUCATIONAL MEASUREMENT AND EVALUATION STUDIES, vol. 8, no. 24 , pp. 27–55, 2019, [Online]. Available: https://sid.ir/paper/371960/en

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