Sammenlign metoder

	Ordinal Rasch Model (Rating Scale Model og Partial Credit Model)	Item Response Theory (IRT)
Fagområde	Psykometri	Psykometri
Familie	Latent structure	Latent structure
Oprindelsesår	1978–1982	1952–1968
Ophavsperson	David Andrich (RSM, 1978); Geoff Masters (PCM, 1982)	Frederic M. Lord (and Allan Birnbaum for the 2PL/3PL models)
Type	Item response model for ordered categories	Probabilistic measurement model
Oprindelig kilde	Andrich, D. (1978). A rating formulation for ordered response categories. Psychometrika, 43(4), 561–573.	Lord, F. M. & Novick, M. R. (1968). Statistical Theories of Mental Test Scores. Addison-Wesley.
Aliasser	Rating Scale Model, Partial Credit Model, RSM, PCM	IRT, latent trait theory, item characteristic curve theory, modern test theory
Relaterede	6	5
Resumé	The ordinal Rasch model extends the dichotomous Rasch framework to items with ordered response categories such as Likert-type scales. It places both persons and items on a shared interval-level metric, enabling principled measurement from ordinal data while checking whether items function consistently across all response thresholds.	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.