เปรียบเทียบวิธี

	Bayesian Differential Item Functioning (Bayesian DIF)	Differential Item Functioning (DIF)
สาขาวิชา	การวัดทางจิตวิทยา	การวัดทางจิตวิทยา
ตระกูล	Latent structure	Latent structure
ปีกำเนิด	1990s–2000s	1970s–1993
ผู้ริเริ่ม	H. Swaminathan & H. J. Rogers (classical DIF); Bayesian extensions developed through Markov chain Monte Carlo IRT methods in the 1990s–2000s	William H. Angoff and colleagues (ETS); systematized by Holland & Wainer
ประเภท	Item bias detection / Bayesian inference	Item-level bias detection
แหล่งต้นตำรับ	Swaminathan, H., & Rogers, H. J. (1990). Detecting differential item functioning using logistic regression procedures. Journal of Educational Measurement, 27(4), 361–370.	Holland, P. W. & Wainer, H. (Eds.) (1993). Differential Item Functioning. Lawrence Erlbaum Associates. ISBN: 978-0805809589
ชื่อเรียกอื่น	Bayesian DIF, Bayesian DIF analysis, Bayesian item bias detection, BDIF	DIF, item bias analysis, measurement non-equivalence, item-level measurement bias
ที่เกี่ยวข้อง	5	5
สรุป	Bayesian differential item functioning analysis detects whether a test item behaves differently across demographic or cultural groups — such as males vs. females — after accounting for the underlying ability or trait being measured. It applies Bayesian IRT estimation to obtain posterior distributions of item parameters separately per group, then evaluates group differences with posterior credibility intervals or Bayes factors rather than classical p-values.	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.