In preparation of large scale surveys on computer science competencies, we are developing proper competency models and evaluation methodologies, aiming to define competencies by sets of exiting questions that are testing congruent abilities. For this purpose, we have to look for sets of test questions that are measuring joint psychometric constructs (competencies) according to the responses of ...

The purpose of this dissertation is to present a new psychometric model that combines a Mixture Rasch model with a diagnostic model. We refer to this model as a diagnostic classification mixture Rasch model (DCMixRM). The motivation for the development of the DCMixRM is twofold. First, the DCMixRM is designed to provide rigorous explanation as to factors that are potentially causing the latent ...

In the original article, it was written that “Then MLE scoring and DIF analysis with RDIF statistics were performed using est_score rdif functions, respectively, in R (R Core Team, 2019) package irtplay (p.90).” However, has been removed from CRAN repository due to intellectual property (IP) violation issues. Instead, a new called irtQ (Lim & Wells, 2023) released as successor irtplay. All IP i...

Measurement theories are important to practice in educational measurement because they provide a background for addressing measurement problems. One of the most important problems is dealing with the Measurement Errors. A good theory can help in understanding the role of errors they play in measurement; (a) To evaluate the examinee's ability to minimize errors and (b) Correlations between varia...