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| Polytom polytomisk validitet× | Graded Response Model (GRM)× | |
|---|---|---|
| Fagområde | Psykometri | Psykometri |
| Familie | Latent structure | Latent structure |
| Oprindelsesår≠ | 1992–2000 | 1969 |
| Ophavsperson≠ | Building on Messick (1989) and IRT extensions by Masters, Muraki, and Samejima | Fumiko Samejima |
| Type≠ | Psychometric validity framework | Item response theory / polytomous IRT model |
| Oprindelig kilde≠ | Muraki, E. (1992). A generalized partial credit model: Application of an EM algorithm. Applied Psychological Measurement, 16(2), 159–176. DOI ↗ | Samejima, F. (1969). Estimation of Latent Ability Using a Response Pattern of Graded Scores. Psychometrika Monograph Supplement, No. 17. link ↗ |
| Aliasser≠ | polytomous item construct validity, ordered-category construct validity, polytomous measurement validity, multi-category scale validity | Samejima's GRM, Derecelendirilmiş Tepki Modeli (GRM), graded IRT model |
| Relaterede≠ | 6 | 7 |
| Resumé≠ | Polytomous construct validity refers to the evaluation of whether a scale composed of ordered, multi-category items (e.g., Likert or rating-scale items) genuinely measures the intended latent construct. It extends classical validity frameworks to polytomous measurement models — such as the Graded Response Model or Generalized Partial Credit Model — ensuring that ordered response categories function as designed and that the resulting scores reflect the target 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. |
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