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Download full textSahin, Alper; Anil, Duygu – Educational Sciences: Theory and Practice, 2017
This study investigates the effects of sample size and test length on item-parameter estimation in test development utilizing three unidimensional dichotomous models of item response theory (IRT). For this purpose, a real language test comprised of 50 items was administered to 6,288 students. Data from this test was used to obtain data sets of…
Descriptors: Test Length, Sample Size, Item Response Theory, Test Construction
