Sammenlign metoder

	Short-form Test-Retest Reliability	Item Response Theory (IRT)
Fagområde	Psykometri	Psykometri
Familie	Latent structure	Latent structure
Oprindelsesår	1990s–2000s	1952–1968
Ophavsperson	Derived from classical test-retest reliability; short-form methodology formalised by Smith, McCarthy & Anderson (2000) among others	Frederic M. Lord (and Allan Birnbaum for the 2PL/3PL models)
Type	Reliability estimation	Probabilistic measurement model
Oprindelig kilde	Smith, G. T., McCarthy, D. M., & Anderson, K. G. (2000). On the sins of short-form development. Psychological Assessment, 12(1), 102–111.	Lord, F. M. & Novick, M. R. (1968). Statistical Theories of Mental Test Scores. Addison-Wesley.
Aliasser	abbreviated scale temporal stability, short-form temporal consistency, retest reliability of short forms, SF test-retest	IRT, latent trait theory, item characteristic curve theory, modern test theory
Relaterede	4	5
Resumé	Short-form test-retest reliability quantifies how consistently an abbreviated version of a measurement instrument produces the same scores across two administrations separated by a defined time interval. It is a critical validation step whenever a full-length scale is shortened for practical use, confirming that item reduction has not degraded temporal stability.	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.