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A Unified Approach to Multi-item Reliability

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The reliability of multi-item scales has received a lot of attention in the psychometric literature, where a myriad of measures like the Cronbach's α or the Spearman–Brown formula have been proposed. Most of these measures, however, are based on very restrictive models that apply only to unidimensional instruments. In this article, we introduce two measures to quantify the reliability of multi-item scales based on a more general model. We show that they capture two different aspects of the reliability problem and satisfy a minimum set of intuitive properties. The relevance and complementary value of the measures is studied and earlier approaches are placed in a broader theoretical framework. Finally, we apply them to investigate the reliability of the Positive and Negative Syndrome Scale, a rating scale for the assessment of the severity of schizophrenia.
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Keywords: Factor analysis; Multi-item rating scales; Reliability

Document Type: Research Article

Affiliations: 1: Center for Statistics, Hasselt University, Agoralaan 1, B3590 Diepenbeek, Belgium 2: Johnson & Johnson Pharmaceutical Research and Development, B2340 Beerse, Belgium 3: Tibotec, Johnson & Johnson, B2800 Mechelen, Belgium

Publication date: 2010-12-01

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