Het gebruik van item response theorie bij persoonlijkheidsmeting

This project focuses on application of item response theory (IRT) in the context of personality measurement and clinical assessment in psychology. On theoretical grounds, compared to classical test theory application of IRT will result in a substantial improvement of the precision and reliability, and can support much more flexible test administration procedures. Two topics will be addressed. First, existing studies suggest that it is unclear which IRT models best describe personality data. Therefore, it will be investigated which IRT models are best suited to describe personality data and which item characteristics determine the fit of an IRT model. Second, it will be investigated empirically whether IRT can indeed improve classification decisions in the personality domain.