Investigation of Equating Error in Tests with Differential Item Functioning

Year 2018, Volume: 5 Issue: 1, 50 - 57, 01.01.2018

Meltem Yurtçu , Cem Oktay Güzeller

https://doi.org/10.21449/ijate.316420

Cited By: 3

Abstract

In this study purposes to indicate the effect of
the number of DIF items and the distribution of DIF items in these forms, which
be equalized on equating error. Mean-mean, mean-standard deviation, Haebara and
Stocking-Lord Methods used in common item design equal groups as equalization
methods. The study included six different simulation conditions. The conditions
were compared according to the number of DIF items and the distribution of DIF
items on tests. The results illustrated that adding DIF items to tests were
equated caused an increase in the errors obtained by equating methods. We may
state that the change in errors is lowest in characteristic curve
transformation methods, largest in moment methods depending on the situations
in these conditions.

Keywords

Equation error, DIF, IRT equation methods, Large Scale Exams

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