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| Kortforms differentiel itemfunktion (Short-Form DIF)× | Kortform Item Response Theory (SF-IRT)× | |
|---|---|---|
| Fagområde | Psykometri | Psykometri |
| Familie | Latent structure | Latent structure |
| Oprindelsesår≠ | 1970s–1990s (DIF); short-form context developed in parallel with scale abbreviation literature | 1980s–2000s |
| Ophavsperson≠ | Angoff, W. H. and subsequent DIF methodologists | Multiple contributors; IRT adapted to short-form contexts from Lord & Novick (1968) and subsequent applied psychometricians |
| Type≠ | Item bias / measurement fairness analysis | Latent trait / item calibration model |
| Oprindelig kilde≠ | Millsap, R. E. (2012). Statistical Approaches to Measurement Invariance. Routledge. ISBN: 978-0-8058-4507-0 | Embretson, S. E. & Reise, S. P. (2000). Item Response Theory for Psychologists. Lawrence Erlbaum Associates. ISBN: 978-0805828191 |
| Aliasser | Short-form DIF, abbreviated scale DIF, DIF in short forms, short-scale DIF detection | SF-IRT, abbreviated scale IRT, short-form calibration, shortened instrument IRT |
| Relaterede | 6 | 6 |
| Resumé≠ | 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 item response theory applies IRT calibration and scoring to abbreviated or shortened psychological scales. It uses item information functions to guide which items to retain from a full-length instrument, then estimates latent trait scores from the reduced item set while preserving psychometric rigor and linkage to the full-scale metric. |
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