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| Graded Response Model (GRM)× | Exploratorische Faktorenanalyse (EFA)× | |
|---|---|---|
| Fachgebiet≠ | Psychometrie | Statistik |
| Familie | Latent structure | Latent structure |
| Entstehungsjahr≠ | 1969 | — |
| Urheber≠ | Fumiko Samejima | — |
| Typ≠ | Item response theory / polytomous IRT model | Latent variable / dimension reduction |
| Wegweisende Quelle≠ | Samejima, F. (1969). Estimation of Latent Ability Using a Response Pattern of Graded Scores. Psychometrika Monograph Supplement, No. 17. link ↗ | Fabrigar, L. R., Wegener, D. T., MacCallum, R. C. & Strahan, E. J. (1999). Evaluating the use of exploratory factor analysis in psychological research. Psychological Methods, 4(3), 272–299. DOI ↗ |
| Aliasnamen | Samejima's GRM, Derecelendirilmiş Tepki Modeli (GRM), graded IRT model | common factor analysis, açımlayıcı faktör analizi, factor analysis |
| Verwandt≠ | 7 | 4 |
| Zusammenfassung≠ | The Graded Response Model is an item response theory model developed by Fumiko Samejima in 1969 for ordered polytomous items such as Likert-type scales. It estimates both the discriminating power of each item and a set of threshold parameters marking the boundaries between adjacent response categories, while simultaneously placing persons on a continuous latent trait scale. | Exploratory factor analysis reduces a large set of observed variables into a smaller number of latent common factors. It is widely used in scale development and psychometrics to uncover the dimensional structure that underlies a set of correlated items, without specifying that structure in advance. |
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