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Comparing Different Trend Estimation Approaches in Country Means and Standard Deviations in International Large-Scale Assessment Studies

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Robitzsch, Alexander; Lüdtke, Oliver – Large-scale Assessments in Education, 2023

One major aim of international large-scale assessments (ILSA) like PISA is to monitor changes in student performance over time. To accomplish this task, a set of common items (i.e., link items) is repeatedly administered in each assessment. Linking methods based on item response theory (IRT) models are used to align the results from the different…

Descriptors: Educational Trends, Trend Analysis, International Assessment, Achievement Tests

Examination of Different Item Response Theory Models on Tests Composed of Testlets

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Kogar, Esin Yilmaz; Kelecioglu, Hülya – Journal of Education and Learning, 2017

The purpose of this research is to first estimate the item and ability parameters and the standard error values related to those parameters obtained from Unidimensional Item Response Theory (UIRT), bifactor (BIF) and Testlet Response Theory models (TRT) in the tests including testlets, when the number of testlets, number of independent items, and…

Descriptors: Item Response Theory, Models, Mathematics Tests, Test Items