AN EVALUATION OF THE TWO PARAMETER (2-PL) IRT MODELS THROUGH A SIMULATION STUDY

Authors : Hülya OLMUŞ, Ezgi NAZMAN, Semra Erbaş

Pages : 235-249

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Publication Date : 2017-03-14

Article Type : Other Papers

Abstract :Our aim is to evaluate parameter estimation of two parameters item response theory insert ignore into journalissuearticles values(2-PL IRT); model using Joint Maximum Likelihood insert ignore into journalissuearticles values(JML);. A simulation study is approached in terms of different sample sizes, number of items and levels of ability parameters for different level of discirimination parameter. As a result of this simulation study examinee ability parameter, item discrimination and difficulty parameters are obtained as well as Test Information Function and Point-biserial Correlation. One of the highlighted results shows that the level of discrimination parameter plays an important role in parameter estimation for 2-PL IRT models. 
Keywords : two parameter item response theory, joint maximum likelihood estimation, parameter estimation, discrimination parameter, ability parameter