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	Bayesian Differential Item Functioning	Różnicowe funkcjonowanie pozycji testowej (DIF)
Dziedzina	Psychometria	Psychometria
Rodzina	Latent structure	Latent structure
Rok powstania	1990s–2000s	1970s–1993
Twórca	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
Typ	Item bias detection / Bayesian inference	Item-level bias detection
Źródło pierwotne	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
Inne nazwy	Bayesian DIF, Bayesian DIF analysis, Bayesian item bias detection, BDIF	DIF, item bias analysis, measurement non-equivalence, item-level measurement bias
Pokrewne	5	5
Podsumowanie	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.