Comparer des méthodes

	Alpha de Cronbach longitudinale	Test de l'invariance longitudinale de la mesure
Domaine	Psychométrie	Psychométrie
Famille	Latent structure	Latent structure
Année d'origine	1951 (alpha); longitudinal application systematised ca. 1990s–2000s	1993
Auteur d'origine	Lee J. Cronbach (alpha); longitudinal extension formalised in scale validation literature from 1980s onward	William Meredith
Type	Reliability estimation across time	Measurement model testing
Source fondatrice	Cronbach, L. J. (1951). Coefficient alpha and the internal structure of tests. Psychometrika, 16(3), 297–334.	Meredith, W. (1993). Measurement invariance, factor analysis and factorial invariance. Psychometrika, 58(4), 525–543.
Alias	repeated-measures alpha, longitudinal internal consistency, wave-specific Cronbach's alpha, time-point reliability estimation	LMI, longitudinal invariance, measurement equivalence across time, temporal measurement invariance
Apparentées	4	3
Résumé	Longitudinal Cronbach's alpha assesses the internal consistency reliability of a scale at each wave of a repeated-measures study and examines whether that reliability remains stable across time. It is an essential step in longitudinal scale validation, ensuring that a scale measures its construct with consistent precision at every measurement occasion.	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.