Methoden vergleichen

	Zweiparametrisches logistisches IRT-Modell (2PL)	Rasch-Modell
Fachgebiet	Psychometrie	Psychometrie
Familie	Latent structure	Latent structure
Entstehungsjahr	1980	1960
Urheber	Frederic M. Lord	Georg Rasch
Typ	Item response model / latent trait model	Item Response Theory / Latent trait model
Wegweisende Quelle	Lord, F. M. (1980). Applications of Item Response Theory to Practical Testing Problems. Erlbaum.	Rasch, G. (1960). Probabilistic Models for Some Intelligence and Attainment Tests. Danish Institute for Educational Research, Copenhagen.
Aliasnamen	two-parameter logistic model, 2PL model, 2PL IRT — İki Parametreli Madde Tepki Modeli	1PL IRT, one-parameter logistic model, Rasch Modeli — 1PL IRT, 1PL model
Verwandt	6	6
Zusammenfassung	The two-parameter logistic item response model, formalised by Frederic Lord (1980), describes the probability that a respondent answers a binary test item correctly as a smooth S-shaped function of the respondent's latent ability. By estimating a separate discrimination parameter for each item alongside a difficulty parameter, 2PL allows items to differ in how sharply they distinguish high- from low-ability respondents — making it the standard model for large-scale educational and psychological assessments.	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.