방법 비교

	Short Form Rasch Model	차별 문항 기능(Differential Item Functioning, DIF)
분야	심리측정학	심리측정학
계열	Latent structure	Latent structure
기원 연도	1960 (Rasch model); short-form application from 1980s onward	1970s–1993
창시자	Georg Rasch	William H. Angoff and colleagues (ETS); systematized by Holland & Wainer
유형	Probabilistic item response model	Item-level bias detection
원전	Rasch, G. (1960). Probabilistic models for some intelligence and attainment tests. Danmarks Paedagogiske Institut.	Holland, P. W. & Wainer, H. (Eds.) (1993). Differential Item Functioning. Lawrence Erlbaum Associates. ISBN: 978-0805809589
별칭	Rasch analysis for abbreviated scales, short scale Rasch calibration, brief instrument Rasch model	DIF, item bias analysis, measurement non-equivalence, item-level measurement bias
관련	6	5
요약	The short form Rasch model applies Rasch measurement theory to abbreviated instrument versions. Rather than using all items from a full scale, researchers select a reduced item set and calibrate it under the Rasch model to verify that the shortened instrument preserves interval-level measurement, adequate person separation, and item fit, enabling efficient yet rigorous measurement with fewer items.	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.