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| Polytom analys× | Graded Response Model (GRM)× | |
|---|---|---|
| Ämnesområde | Psykometri | Psykometri |
| Familj | Latent structure | Latent structure |
| Ursprungsår≠ | 1969–1982 | 1969 |
| Upphovsperson≠ | Fumiko Samejima (graded response model, 1969); David Andrich (rating scale model, 1978); Geoffrey Masters (partial credit model, 1982) | Fumiko Samejima |
| Typ≠ | Item-level psychometric analysis | Item response theory / polytomous IRT model |
| Ursprungskälla≠ | Samejima, F. (1969). Estimation of latent ability using a response pattern of graded scores. Psychometrika Monograph Supplement, 34(4, Pt. 2), 1–97. DOI ↗ | Samejima, F. (1969). Estimation of Latent Ability Using a Response Pattern of Graded Scores. Psychometrika Monograph Supplement, No. 17. link ↗ |
| Alias≠ | ordered-category item analysis, graded response analysis, polytomous IRT, rated-scale item analysis | Samejima's GRM, Derecelendirilmiş Tepki Modeli (GRM), graded IRT model |
| Närliggande≠ | 4 | 7 |
| Sammanfattning≠ | Polytomous item analysis examines the psychometric behavior of items that have more than two ordered response categories — such as Likert-type scales or partial-credit tasks. It evaluates each item's difficulty thresholds, discriminating power, and category functioning to determine whether the full response scale is being used as intended and whether each item contributes reliably to measuring the underlying construct. | 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. |
| ScholarGateDatamängd ↗ |
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