Latent structureScale / measurement
Longitudinal Item Response Theory (LIRT)
Longitudinal IRT extends classical item response theory to data collected at multiple time points, allowing researchers to model both the initial latent trait level and its change over time. It is used in educational assessment, clinical trials, and panel studies where the same items or item banks are administered repeatedly to the same individuals.
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Sources
- Embretson, S. E. (1991). A multidimensional latent trait model for measuring learning and change. Psychometrika, 56(3), 495–515. DOI: 10.1007/BF02294487 ↗
- von Davier, M. & Carstensen, C. H. (Eds.) (2007). Multivariate and Mixture Distribution Rasch Models: Extensions and Applications. Springer. ISBN: 978-0387329161