Sammenlign metoder

	Måleinvarians for kortversjoner	Differensiert varefunksjonering (DIF)
Fagfelt	Psykometri	Psykometri
Familie	Latent structure	Latent structure
Opprinnelsesår	2000s	1970s–1993
Opphavsperson	Adapted from Vandenberg & Lance (2000) and Millsap & Kwok (2004) invariance framework applied to short-form scales	William H. Angoff and colleagues (ETS); systematized by Holland & Wainer
Type	Measurement equivalence testing	Item-level bias detection
Opprinnelig kilde	Millsap, R. E., & Kwok, O. M. (2004). Evaluating the impact of partial factor loading and intercept invariance on selection in two populations. Psychological Methods, 9(1), 93–115.	Holland, P. W. & Wainer, H. (Eds.) (1993). Differential Item Functioning. Lawrence Erlbaum Associates. ISBN: 978-0805809589
Alias	SF-MI, abbreviated scale invariance, short-form factorial invariance, brief measure invariance	DIF, item bias analysis, measurement non-equivalence, item-level measurement bias
Relaterte	6	5
Sammendrag	Short form measurement invariance testing evaluates whether an abbreviated version of a psychological scale measures the same latent construct equivalently across groups or conditions. It applies the hierarchical multigroup confirmatory factor analysis invariance sequence — configural, metric, scalar, and strict — specifically to short-form instruments, ensuring that brevity does not introduce measurement bias when comparing subgroups.	Differential item functioning identifies test or survey items that behave differently for examinees from different groups — such as gender, ethnicity, or language background — after controlling for the underlying ability or trait being measured. DIF analysis is essential for fairness evaluation in educational testing and psychological scale development.