Compara mètodes

	Funcionament Diferencial d'Ítems en Formes Curtes (Short-Form DIF)	Anàlisi Factorial Confirmatori de Forma Breu (SF-CFA)
Camp	Psicometria	Psicometria
Família	Latent structure	Latent structure
Any d'origen	1970s–1990s (DIF); short-form context developed in parallel with scale abbreviation literature	1990s–2000s
Autor original	Angoff, W. H. and subsequent DIF methodologists	Building on CFA methodology (Jöreskog, 1969) applied to abbreviated scale contexts
Tipus	Item bias / measurement fairness analysis	Confirmatory latent-variable model
Font seminal	Millsap, R. E. (2012). Statistical Approaches to Measurement Invariance. Routledge. ISBN: 978-0-8058-4507-0	Byrne, B. M. (2008). Structural Equation Modeling with EQS: Basic Concepts, Applications, and Programming (2nd ed.). Lawrence Erlbaum Associates. ISBN: 978-0805841268
Àlies	Short-form DIF, abbreviated scale DIF, DIF in short forms, short-scale DIF detection	SF-CFA, abbreviated scale CFA, short-form validation, brief scale factor analysis
Relacionats	6	4
Resum	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.	Short-form confirmatory factor analysis applies CFA to a reduced subset of items drawn from a longer validated scale, testing whether the abbreviated version preserves the original factor structure with acceptable model fit and reliability. It is a standard step in short-form scale development and validation.