BADEMCİ, Vahit Gazi Üniversitesi - Endüstriyel Sanatlar Eğitim Fakültesi, Turkey

A Study on the Kuder-Richardson 20, Cronbach’s Alpha, Hoyt’s Analysis of Variance, Generalizability Theory and Score Reliability

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Reliability and validity are not the characteristics of tests or measurement instruments. Validity also refers to scores not to the measurement instrument itself, like reliability. Accordingly, it is not correct to use the terms such as “the reliability of the test” or “the validity of the scale”. It is not the tests or measurement instruments which are reliable or unreliable but the scores obtained from a test or measurement instrument. For this reason, statements such as “score reliability” or “the reliability of the test scores” should be used. Cronbach’s alfa, the Kuder-Richardson 20 and Hoyt’s analysis of variance are commonly used methods in estimating the internal consistency reliability. The Kuder-Richardson 20 is only suitable for dichotomously scored items [0,1]. Cronbach’s alpha can be both used with dichotomously scored items [0,1] and weightily scored items [1,2,3,4,5]. The formulas of the Kuder-Richardson 20, Cronbach’s alpha and Hoyt’s analysis of variance give identical results when all items scored dichotomously [0, 1].

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Score reliability , validity , the Kuder , Richardson 20 , Cronbach’s alpha , Hoyt’s analysis of variance , generalizability theory.

Dicle University Journal Of Ziya Gökalp Faculty Of Education

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