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Cronbach’s alpha

Cronbach’s alpha. assessing scale reliability. Cronbach's alpha is one of the most common measures of reliability. It measures the internal consistency of the items in a scale. It indicates the extent to which the items in a questionnaire are related to each other

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Cronbach’s alpha

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  1. Cronbach’s alpha assessing scale reliability

  2. Cronbach's alpha is one of the most common measures of reliability. It measures the internal consistency of the items in a scale. It indicates the extent to which the items in a questionnaire are related to each other It indicates whether a scale is unidimensional or multidimensional Cronbach’s alpha

  3. Interpreting scale reliability • The higher the alpha, the more reliable the scale. • A score of .70 or greater is generally considered to be acceptable • .90 or > = high reliability • .80-.89 = good reliability • .70-79 = acceptable reliability • .65-.69 = marginal reliability • lower thresholds are sometimes used.

  4. Example of an alpha score • The Happiness Subscale of the Short Version of the Adolescent General Well-Being (AGWB) Scale (Columbo, 1984/1986) • The “happiness subscale” is a 9-item, 5-point Likert scale that assesses adolescents’ personal experience of happiness. • Scores range from 9 to 45, with higher scores indicating greater happiness. • The population of intended use is adolescents aged 14 to 18 years. • Empirical studies have suggested the internal consistency of the scale with alphas ranging from .87 to .90 (Mahon & Yarcheski, 2002).

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