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	Kortformsmodellen enligt Rasch	Kortformsmodellen inom Item Response Theory (SF-IRT)
Ämnesområde	Psykometri	Psykometri
Familj	Latent structure	Latent structure
Ursprungsår	1960 (Rasch model); short-form application from 1980s onward	1980s–2000s
Upphovsperson	Georg Rasch	Multiple contributors; IRT adapted to short-form contexts from Lord & Novick (1968) and subsequent applied psychometricians
Typ	Probabilistic item response model	Latent trait / item calibration model
Ursprungskälla	Rasch, G. (1960). Probabilistic models for some intelligence and attainment tests. Danmarks Paedagogiske Institut.	Embretson, S. E. & Reise, S. P. (2000). Item Response Theory for Psychologists. Lawrence Erlbaum Associates. ISBN: 978-0805828191
Alias	Rasch analysis for abbreviated scales, short scale Rasch calibration, brief instrument Rasch model	SF-IRT, abbreviated scale IRT, short-form calibration, shortened instrument IRT
Närliggande	6	6
Sammanfattning	The short form Rasch model applies Rasch measurement theory to abbreviated instrument versions. Rather than using all items from a full scale, researchers select a reduced item set and calibrate it under the Rasch model to verify that the shortened instrument preserves interval-level measurement, adequate person separation, and item fit, enabling efficient yet rigorous measurement with fewer items.	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.