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All Journal Jounal of Education and Teaching (JET)
Syahrul Syahrul
Research and Evaluation of Education-Postgraduate Program, Universitas Negeri Makassar, Indonesia
Education

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The Effect of Proportion and Position of Anchor Items Toward Test Equating Syahrul Syahrul; Mansyur Mansyur; Muh. Rusdi; Suryadi Ishak
Journal of Education and Teaching (JET) Vol 6 No 2 (2025): Mei 2025
Publisher : Fakultas Keguruan dan Ilmu Pendidikan, Universitas Muhammadiyah kendari

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51454/jet.v6i2.583

Abstract

This study examines how the proportion and position of anchor items influence test equating results, a key component in ensuring fairness and accuracy in standardized assessments. In this experimental design, the independent variables are the proportion and position of anchor items, and the dependent variable is the absolute difference in ability parameters before and after the equating process. To assess this, we analyzed test response data from 1,000 respondents, each completing 40 items across 24 data sets, generated through Monte Carlo simulations for reliability. The analysis was conducted using bi-factor cell mean analysis, a method that explores the interaction between various factors influencing equating outcomes. Results show that (1) a higher proportion of anchor items enhances the accuracy of test equating, (2) the position of anchor items significantly affects the equating outcomes, with positions at the beginning showing the highest accuracy, (3) the interaction of both proportion and position plays a crucial role in improving equating results, and (4) the position of anchor items has a more significant impact on equating accuracy than the proportion of anchor items. 
Co-Authors Mansyur Mansyur Muh. Rusdi Suryadi Ishak