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	Kortformsmodellen enligt Rasch	Raschmodell
Ämnesområde	Psykometri	Psykometri
Familj	Latent structure	Latent structure
Ursprungsår	1960 (Rasch model); short-form application from 1980s onward	1960
Upphovsperson	Georg Rasch	Georg Rasch
Typ	Probabilistic item response model	Item Response Theory / Latent trait model
Ursprungskälla	Rasch, G. (1960). Probabilistic models for some intelligence and attainment tests. Danmarks Paedagogiske Institut.	Rasch, G. (1960). Probabilistic Models for Some Intelligence and Attainment Tests. Danish Institute for Educational Research, Copenhagen.
Alias	Rasch analysis for abbreviated scales, short scale Rasch calibration, brief instrument Rasch model	1PL IRT, one-parameter logistic model, Rasch Modeli — 1PL IRT, 1PL model
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.	The Rasch model, introduced by Georg Rasch in 1960, is the simplest member of the Item Response Theory (IRT) family. It assigns a single difficulty parameter to each test item and places both item difficulties and person abilities on the same logit scale, enabling direct, sample-independent comparison of items and persons.