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	Short form differential item functioning	Diferenciované fungovanie položky (DIF)
Odbor	Psychometria	Psychometria
Rodina	Latent structure	Latent structure
Rok vzniku	1970s–1990s (DIF); short-form context developed in parallel with scale abbreviation literature	1970s–1993
Tvorca	Angoff, W. H. and subsequent DIF methodologists	William H. Angoff and colleagues (ETS); systematized by Holland & Wainer
Typ	Item bias / measurement fairness analysis	Item-level bias detection
Pôvodný zdroj	Millsap, R. E. (2012). Statistical Approaches to Measurement Invariance. Routledge. ISBN: 978-0-8058-4507-0	Holland, P. W. & Wainer, H. (Eds.) (1993). Differential Item Functioning. Lawrence Erlbaum Associates. ISBN: 978-0805809589
Ďalšie názvy	Short-form DIF, abbreviated scale DIF, DIF in short forms, short-scale DIF detection	DIF, item bias analysis, measurement non-equivalence, item-level measurement bias
Príbuzné	6	5
Zhrnutie	Short-form differential item functioning (DIF) analysis examines whether individual items in an abbreviated scale function equivalently across demographic or subgroup comparisons. When a scale is shortened, retained items must still behave fairly for all relevant groups — DIF analysis verifies this, ensuring that score differences reflect true ability or trait differences rather than item bias.	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.