Lechner, Clemens M., Nivedita Bhaktha, Katharina Groskurth, and Matthias Bluemke. “Why Ability Point Estimates Can Be Pointless: A Primer on Using Skill Measures From Large-Scale Assessments in Secondary Analyses”. Measurement Instruments for the Social Sciences 3, no. 1 (January 19, 2021): Article e11033. Accessed May 7, 2026. https://miss.psychopen.eu/index.php/miss/article/view/11033.