Guessing and Development of Alternative IRT Models with Guessing

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Teerut Suksakulwat
Nuttaporn Lawthong
Siwachoat Srisuttiyakorn


Guessing is an unavoidable problem for measurement and evaluation with multiple-choice tests. Although preliminary prevention is performed using various methods, it may not be perfect because the factors that cause the guessing may come from many reasons. These limitations became the rationale for developing different types of item response theory (IRT) model to measure the guessing. The issues presented in the article are as follows: 1) Guessing in multiple-choice tests has two types: random guessing and ability-based guessing; 2) Characteristics of test and test takers factors that affect guessing; 3) IRT models are Rasch, 2PL and 3PL models; 4) The alternative IRT models with guessing are AG, FG3PL, 2PLG, 3P-RH and 2PLE models, and 5) Comparison of differences between alternative IRT models with guessing.


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