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Examination of Testlet Effect in Open-Ended Items

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  • Gülden Kaya Uyanik
  • Levent Ertuna

Abstract

The testlets are prevalently used in national and international standard tests and the teacher-made achievement tests thanks to their practicality. The purpose of the current study is to evaluate the testlet effect in test consisting the open-ended items and to identify the possible errors when this effect is ignored. The data consists of the scores given by three raters of the responses of 380 students in the teacher training program to two open-ended items in two testlets. The two designs with and without the testlet effect were modeled (totally crossed random design and the nested random design) and the differences between them were analyzed by Generalizability Theory (GT). The results showed that raters had a slight effect on the scores in both models tested, and the reliability of the scores was overestimated when the testlet effect was not ignored in such measurement tools.

Suggested Citation

  • Gülden Kaya Uyanik & Levent Ertuna, 2022. "Examination of Testlet Effect in Open-Ended Items," SAGE Open, , vol. 12(1), pages 21582440221, February.
    • Handle: RePEc:sae:sagope:v:12:y:2022:i:1:p:21582440221079849
    DOI: 10.1177/21582440221079849
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    References listed on IDEAS

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    1. Muirne C. S. Paap & Qiwei He & Bernard P. Veldkamp, 2015. "Selecting Testlet Features With Predictive Value for the Testlet Effect," SAGE Open, , vol. 5(2), pages 21582440155, April.
    2. Robert Gibbons & Donald Hedeker, 1992. "Full-information item bi-factor analysis," Psychometrika, Springer;The Psychometric Society, vol. 57(3), pages 423-436, September.
    3. Hamdollah Ravand, 2015. "Assessing Testlet Effect, Impact, Differential Testlet, and Item Functioning Using Cross-Classified Multilevel Measurement Modeling," SAGE Open, , vol. 5(2), pages 21582440155, May.
    4. Eric Bradlow & Howard Wainer & Xiaohui Wang, 1999. "A Bayesian random effects model for testlets," Psychometrika, Springer;The Psychometric Society, vol. 64(2), pages 153-168, June.
    5. Sonia Ferreira Lopes Toffoli & Dalton Francisco de Andrade & Antonio Cezar Bornia, 2016. "Evaluation of open items using the many-facet Rasch model," Journal of Applied Statistics, Taylor & Francis Journals, vol. 43(2), pages 299-316, February.
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