Comparison of Different Computerized Adaptive Testing Approaches with Shadow Test Under Different Test Length and Ability Estimation Method Conditions

Year 2023, Volume: 14 Issue: 4, 396 - 412, 31.12.2023

Mahmut Sami Yiğiter , Nuri Doğan

https://doi.org/10.21031/epod.1202599

Abstract

Adaptive testing approaches have been used and adopted in many international large-scale assessments (PISA, TIMSS, PIRLS, etc.). The shadow test approach, on the other hand, is an innovative testing approach that both meets all test specifications and constraints and aims to provide maximum information at the test taker's true ability level. The aim of this study is to investigate the effectiveness of four different adaptive testing approaches created with shadow test (CAT, 2-Stage O-MST, 3-Stage O-MST and LOFT) according to the test length and ability estimation method. With the Monte Carlo (MC) study in R software, 200 item parameters and 2000 test takers were generated under the 3PL model and the results were calculated over 50 replications. The results show that CAT, 2-Stage O-MST and 3-Stage O-MST are quite similar in effectiveness, while LOFT is less effective than these techniques. As the test length increases, the measurement precision increases in all different types of adaptive tests. Although EAP method generally presents better measurement precision than MLE method, at the extremes of the ability scale MLE has been found to present good measurement precision. In the research, it is discussed that large-scale assessments can benefit from adaptive testing created with shadow test approach.

Keywords

computerized adaptive testing, shadow test, on-the-fly multistage testing, linear on-the-fly test

Supporting Institution

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Project Number

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