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	Utveckling av skalor för flera grupper	Differential Item Functioning (DIF)
Ämnesområde	Psykometri	Psykometri
Familj	Latent structure	Latent structure
Ursprungsår	1971 (multi-group CFA); 2000 (applied synthesis for scale development)	1970s–1993
Upphovsperson	Jöreskog, K. G. (multi-group SEM framework); systematised for scale development by Vandenberg & Lance (2000)	William H. Angoff and colleagues (ETS); systematized by Holland & Wainer
Typ	Scale development / measurement model testing	Item-level bias detection
Ursprungskälla	Vandenberg, R. J., & Lance, C. E. (2000). A review and synthesis of the measurement invariance literature: Suggestions, practices, and recommendations for organizational research. Organizational Research Methods, 3(1), 4–70.	Holland, P. W. & Wainer, H. (Eds.) (1993). Differential Item Functioning. Lawrence Erlbaum Associates. ISBN: 978-0805809589
Alias	MGSD, cross-group scale development, multi-sample scale development, comparative scale construction	DIF, item bias analysis, measurement non-equivalence, item-level measurement bias
Närliggande	6	5
Sammanfattning	Multi-group scale development constructs and validates a measurement scale simultaneously across two or more distinct populations or groups. The approach integrates standard item generation and factor-analytic procedures with a systematic hierarchy of measurement invariance tests to ensure that the resulting scale measures the same construct in the same way in every target group.	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.