Detection of differential item functioning with latent class analysis: PISA 2018 mathematical literacy test

Year 2024, Volume: 11 Issue: 2, 249 - 269, 20.06.2024

Selim Daşçıoğlu , Tuncay Öğretmen

https://doi.org/10.21449/ijate.1387041

Abstract

The purpose of this research is to determine whether PISA 2018 mathematical literacy test items show a differential item functioning across countries. For this purpose, only the items in booklet number three were examined using the MIMIC method with Latent Class Analysis (LCA) approach. PISA 2018 tests are mostly developed in English. Therefore, in DIF analyses, the reference group is the UK, while the focal groups consist of the other countries examined in the research (Türkiye, Finland, Japan, and the USA). According to the results, of the 23 test items, statistically significant DIF was observed in eight items in the UK-Türkiye sample, in seven items in the UK-Finland sample, in eleven items in the UK-Japan sample, and in three items in the UK-USA sample. It is seen that the effect and size of DIF in non-homogeneous groups differ between groups and these effects can be examined in more detail with the LCA method.

Keywords

Cross country DIF, Finite mixture models, MIMIC, Latent class analysis, PISA

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