Jochen Ranger

Jochen Ranger is a Researcher at the Department of Methodology within the Institute of Psychology, Faculty of Philosophy I at Martin Luther University Halle-Wittenberg. His work focuses on psychometric modeling, particularly integrating response times and accuracy in test analysis.

• Key Research Areas: Item Response Theory (IRT), response time modeling, diffusion models, hierarchical models, and cognitive processes in test-taking.
• Contributions: Developed statistical methods (e.g., Hausman test for model fit, proportional hazards models) and computational tools (e.g., R scripts for LBA and diffusion models).
• Collaborations: Frequent co-authorship with J.-T. Kuhn, C. Szardenings, and T. Ortner on IRT extensions and cognitive modeling.

His publications from 2012–2020 highlight advancements in IRT calibration, model robustness, and applications to personality and educational testing. Notable works include studies on the speed-accuracy trade-off, dyscalculia assessment, and neuroleptic treatment decisions.