Cronbach s alpha is the average value of the reliability coefficients one would obtained for all possible combinations of items when split into two halftests. This result shows that the data collected in the study were reliable salvucci et al. Using and interpreting cronbachs alpha university of. Cronbach s alpha is a measure of internal consistency, that is, how closely related a set of items are as a group. Researcherdeveloped multipleitem instruments with likerttype scaling number % reliability coefficients reported analysis strategy. Before alpha, researchers were limited to estimating internal consistency of only dichotomously scored items using the kr20 formula. Cronbachs alpha is a measure used to assess the reliability, or internal consistency, of a set of scale or test items. A high value for alpha does not imply that the measure is unidimensional. Calculating, interpreting, and reporting cronbachs alpha. Development of a questionnaire to assess the dietary behaviors of.
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