เปรียบเทียบวิธี

	รูปแบบ Rasch ฉบับย่อ	Differential Item Functioning (DIF)
สาขาวิชา	การวัดทางจิตวิทยา	การวัดทางจิตวิทยา
ตระกูล	Latent structure	Latent structure
ปีกำเนิด	1960 (Rasch model); short-form application from 1980s onward	1970s–1993
ผู้ริเริ่ม	Georg Rasch	William H. Angoff and colleagues (ETS); systematized by Holland & Wainer
ประเภท	Probabilistic item response model	Item-level bias detection
แหล่งต้นตำรับ	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
ชื่อเรียกอื่น	Rasch analysis for abbreviated scales, short scale Rasch calibration, brief instrument Rasch model	DIF, item bias analysis, measurement non-equivalence, item-level measurement bias
ที่เกี่ยวข้อง	6	5
สรุป	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.