Confronta i metodi

	Funzionamento Differenziale dell'Item Longitudinale (Longitudinal DIF)	Test di Invarianza di Misura
Campo	Psicometria	Psicometria
Famiglia	Latent structure	Latent structure
Anno di origine	1980s–2000s	2000
Ideatore	Multiple contributors; foundational DIF methods by Lord (1980) extended to longitudinal designs	Vandenberg & Lance
Tipo	Item-level bias detection across time	Multi-group confirmatory factor analysis procedure
Fonte seminale	Millsap, R. E., & Kwok, O. M. (2004). Evaluating the impact of partial factorial measurement invariance on selection in two groups. Psychological Methods, 9(1), 93–115.	Vandenberg, R. J., & Lance, C. E. (2000). A review and synthesis of the measurement invariance literature. Organizational Research Methods, 3(1), 4–70.
Alias	longitudinal DIF, DIF across time, temporal DIF, longitudinal item bias	Factorial Invariance, Measurement Equivalence, Configural-Metric-Scalar Testing, Ölçüm Değişmezliği
Correlati	6	3
Sintesi	Longitudinal differential item functioning detects whether individual test or scale items behave differently across measurement occasions for the same respondents. It extends standard DIF methodology to repeated-measures designs, ensuring that observed change scores genuinely reflect construct change rather than shifts in item characteristics over time.	Measurement invariance testing is a sequence of nested confirmatory factor analysis (CFA) models that examines whether a psychological scale measures the same latent construct in the same way across distinct groups or time points. Systematized and popularized by Vandenberg and Lance (2000), the procedure tests a hierarchy of constraints — from identical factor patterns to identical item intercepts — so that researchers can justify meaningful group comparisons on latent means.