手法を比較

	短縮版項目機能差 (Short-Form DIF) 分析	項目応答理論における項目特性曲線（ICC）の差
分野	心理測定学	心理測定学
系統	Latent structure	Latent structure
提唱年	1970s–1990s (DIF); short-form context developed in parallel with scale abbreviation literature	1970s–1993
提唱者	Angoff, W. H. and subsequent DIF methodologists	William H. Angoff and colleagues (ETS); systematized by Holland & Wainer
種類	Item bias / measurement fairness analysis	Item-level bias detection
原典	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
別名	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
関連	6	5
概要	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.