Σύγκριση μεθόδων

	Longitudinal IRT	Δοκιμή Διαχρονικής Αμεταβλητότητας Μέτρησης
Πεδίο	Ψυχομετρία	Ψυχομετρία
Οικογένεια	Latent structure	Latent structure
Έτος προέλευσης	1991	1993
Δημιουργός	Susan E. Embretson	William Meredith
Τύπος	Latent trait / longitudinal psychometric model	Measurement model testing
Θεμελιώδης πηγή	Embretson, S. E. (1991). A multidimensional latent trait model for measuring learning and change. Psychometrika, 56(3), 495–515.	Meredith, W. (1993). Measurement invariance, factor analysis and factorial invariance. Psychometrika, 58(4), 525–543.
Εναλλακτικές ονομασίες	LIRT, longitudinal IRT, repeated-measures IRT, dynamic item response modeling	LMI, longitudinal invariance, measurement equivalence across time, temporal measurement invariance
Συναφείς	4	3
Σύνοψη	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.	Longitudinal measurement invariance testing determines whether a psychological scale measures the same construct in the same way across two or more time points. It is a prerequisite for interpreting mean-level change scores in panel and repeated-measures studies, ensuring that observed change reflects true change in the construct rather than drift in the measurement instrument.