Year 2021, Volume 8 , Issue 2, Pages 239 - 256 2021-06-10

An Investigation of Item Position Effects by Means of IRT-Based Differential Item Functioning Methods

Sümeyra SOYSAL [1] , Esin YILMAZ KOĞAR [2]

In this study, whether item position effects lead to DIF in the condition where different test booklets are used was investigated. To do this the methods of Lord’s chi-square and Raju’s unsigned area with the 3PL model under with and without item purification were used. When the performance of the methods was compared, it was revealed that generally, the method of Lord’s chi-square identified more items with DIF than did the method of Raju’s unsigned area. The differentiation of the booklets with respect to item position resulted in a higher number of items displaying DIF with item purification conditions. Based on the findings of the present study, to avoid the occurrence of DIF due to item position effects, it is recommended to position the same items across different booklets in similar locations when forming different booklets.

Item position effects, Item response theory, Differential item function, Unsigned Raju’s Area, Lord’s chi-square
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Primary Language en
Subjects Education, Scientific Disciplines
Published Date June
Journal Section Articles

Orcid: 0000-0002-7304-1722
Author: Sümeyra SOYSAL (Primary Author)
Institution: Necmettin Erbakan University
Country: Turkey

Orcid: 0000-0001-6755-9018
Country: Turkey


Publication Date : June 10, 2021

APA Soysal, S , Yılmaz Koğar, E . (2021). An Investigation of Item Position Effects by Means of IRT-Based Differential Item Functioning Methods . International Journal of Assessment Tools in Education , 8 (2) , 239-256 . DOI: 10.21449/ijate.779963