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| Krótka forma Alfa Cronbacha× | Teoria odpowiedzi na pozycje (IRT)× | |
|---|---|---|
| Dziedzina | Psychometria | Psychometria |
| Rodzina | Latent structure | Latent structure |
| Rok powstania≠ | 1951 (alpha); short-form practice codified 1980s–2000s | 1952–1968 |
| Twórca≠ | L. J. Cronbach (alpha); short-form application formalized across scale-abbreviation literature | Frederic M. Lord (and Allan Birnbaum for the 2PL/3PL models) |
| Typ≠ | Internal consistency reliability coefficient | Probabilistic measurement model |
| Źródło pierwotne≠ | Smith, G. T., McCarthy, D. M. & Anderson, K. G. (2000). On the sins of short-form development. Psychological Assessment, 12(1), 102–111. DOI ↗ | Lord, F. M. & Novick, M. R. (1968). Statistical Theories of Mental Test Scores. Addison-Wesley. link ↗ |
| Inne nazwy | abbreviated scale alpha, brief scale internal consistency, short-scale Cronbach's alpha, reduced-item alpha | IRT, latent trait theory, item characteristic curve theory, modern test theory |
| Pokrewne≠ | 4 | 5 |
| Podsumowanie≠ | Short-form Cronbach's alpha quantifies the internal consistency reliability of an abbreviated version of a psychological scale. It applies Cronbach's alpha formula to a reduced item set, verifying that the shortened instrument retains sufficient reliability to support valid score interpretation in research and applied contexts. | 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. |
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