Eudald Correig-Fraga
Researcher and AI Product Manager at Innovamat
Researcher and AI Product Manager at Innovamat since 2021, where he leads data and research initiatives applied to mathematics learning. He was previously a researcher at Universitat Rovira i Virgili, working on biostatistics, metabolomics and environmental health, and worked at the University of California, Santa Cruz.
workingpaper Education
Explaining the learning decline in PISA 2025 by socioeconomic quartiles through methodological changes
Lucía Cobreros Vicente, Marc Colomer, Eudald Correig-Fraga, Lucas Gortazar, Isaac Sayol
23 Sep, 2026
Working paper in collaboration with Innovamat Research Lab PISA 2025 Volume I (OECD 2026a) reports that the socioeconomic gap narrowed between 2022 and 2025 because advantaged students declined most — “a new phenomenon of affluent students who struggle academically”. However, this pattern is explained by the changes in how the index of economic, social and […]