Methoden vergelijken

	Short-Form Item Response Theory (SF-IRT)	Item Response Theory (IRT)
Vakgebied	Psychometrie	Psychometrie
Familie	Latent structure	Latent structure
Jaar van ontstaan	1980s–2000s	1952–1968
Grondlegger	Multiple contributors; IRT adapted to short-form contexts from Lord & Novick (1968) and subsequent applied psychometricians	Frederic M. Lord (and Allan Birnbaum for the 2PL/3PL models)
Type	Latent trait / item calibration model	Probabilistic measurement model
Oorspronkelijke bron	Embretson, S. E. & Reise, S. P. (2000). Item Response Theory for Psychologists. Lawrence Erlbaum Associates. ISBN: 978-0805828191	Lord, F. M. & Novick, M. R. (1968). Statistical Theories of Mental Test Scores. Addison-Wesley.
Aliassen	SF-IRT, abbreviated scale IRT, short-form calibration, shortened instrument IRT	IRT, latent trait theory, item characteristic curve theory, modern test theory
Verwant	6	5
Samenvatting	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.	Item response theory models the probability that a respondent answers an item correctly (or endorses it) as a function of the respondent's latent trait level and the item's own statistical properties — difficulty, discrimination, and guessing. Unlike classical test theory, IRT places persons and items on the same scale, yielding measurement that is sample-independent for items and test-independent for persons.