Krahasoni metodat

	Diferencimi i Përditshëm i Funksionimit të Artikulit (Longitudinal DIF)	Testimi i Invariancës së Matjes
Fusha	Psikometri	Psikometri
Familja	Latent structure	Latent structure
Viti i origjinës	1980s–2000s	2000
Krijuesi	Multiple contributors; foundational DIF methods by Lord (1980) extended to longitudinal designs	Vandenberg & Lance
Lloji	Item-level bias detection across time	Multi-group confirmatory factor analysis procedure
Burimi themelues	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.
Emërtime të tjera	longitudinal DIF, DIF across time, temporal DIF, longitudinal item bias	Factorial Invariance, Measurement Equivalence, Configural-Metric-Scalar Testing, Ölçüm Değişmezliği
Të lidhura	6	3
Përmbledhja	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.