MEMBANDINGKAN IRT MODEL 3PL DENGAN IRT MODEL 4PL UNTUK PENILAIAN MENGGUNAKAN COMPUTERIZED ADAPTIVE TEST

The Robustness of the Unidimensional 3PL IRT Model When Applied to Two-dimensional Data in Computerized Adaptive Testing

Variance Decomposition Using an IRT Measurement Model

Large scale research projects in behaviour genetics and genetic epidemiology are often based on questionnaire or interview data. Typically, a number of items is presented to a number of subjects, the subjects' sum scores on the items are computed, and the variance of sum scores is decomposed into a number of variance components. This paper discusses several disadvantages of the approach of anal...

CTT and IRT 1 Test Construction using CTT and IRT with Unrepresentative Samples

We compare test construction using CTT and IRT in several sample sizes (from N=20 to N=5000) and degrees of representativeness (represented by selecting the top 20%, 40%, 60%, 80% or 100% of a population) using a Monte-Carlo simulation design. Little support was found for our hypothesis that IRT would outperform CTT in building informative tests, especially in large or unrepresentative samples....

Assessing IRT Model-Data Fit for Mixed Format Tests

This study examined various model combinations and calibration procedures for mixed format tests under different item response theory (IRT) models and calibration methods. Using real data sets that consist of both dichotomous and polytomous items, nine possibly applicable IRT model mixtures and two calibration procedures were compared based on traditional and alternative goodnessof-fit statisti...

A Hierarchical IRT Model for Criterion-Referenced Measurement

A hierarchical IRT model is proposed for mastery classification in criterionreferenced measurement. In this model, items measuring the same criterion are grouped, and a difficulty and discrimination parameter of the criterion is estimated on the same scale as the person and item parameters. The level of proficiency of a student with respect to the criterion is determined by the probability of s...