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| Autor/in | Almehrizi, Rashid S. |
|---|---|
| Titel | Coefficient [beta] as Extension of KR-21 Reliability for Summed and Scaled Scores for Polytomously-Scored Tests |
| Quelle | In: Applied Measurement in Education, 34 (2021) 2, S.139-149 (11 Seiten)Infoseite zur Zeitschrift
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| Zusatzinformation | ORCID (Almehrizi, Rashid S.) |
| Sprache | englisch |
| Dokumenttyp | gedruckt; online; Zeitschriftenaufsatz |
| ISSN | 0895-7347 |
| DOI | 10.1080/08957347.2021.1890740 |
| Schlagwörter | Test Reliability; Scores; Scoring; Computation; Test Items; Mathematical Formulas; Foreign Countries; Self Efficacy; Anxiety; Beginning Teachers; Oman |
| Abstract | KR-21 reliability and its extension (coefficient [alpha]) gives the reliability estimate of test scores under the assumption of tau-equivalent forms. KR-21 reliability gives the reliability estimate for summed scores for dichotomous items when items are randomly sampled from an infinite pool of similar items (randomly parallel forms). The article extends KR-21 to coefficient [beta] to estimate reliability of summed scores for test with any item scoring pattern under the same assumption of KR-21. Also, the article presents coefficient G[beta] to estimate this reliability for nonlinearly scaled scores for any type of items. The article shows that coefficient [beta] is slightly different from the classical index of reliability. Results show that coefficient [beta] is not equal to the classical index of reliability for summed scores and scaled scores. Moreover, results using real data on psychological instruments reveal that different score scales yield different coefficient G[beta] reliability estimates that are less than coefficient G[alpha] by a function related to form-to-form differences in averages. (As Provided). |
| Anmerkungen | Routledge. Available from: Taylor & Francis, Ltd. 530 Walnut Street Suite 850, Philadelphia, PA 19106. Tel: 800-354-1420; Tel: 215-625-8900; Fax: 215-207-0050; Web site: http://www.tandf.co.uk/journals |
| Erfasst von | ERIC (Education Resources Information Center), Washington, DC |
| Update | 2024/1/01 |
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