Beyond alpha: An empirical examination of the effects of different sources of measurement error on reliability estimates for measures of individual-differences constructs.
Abstract
On the basis of an empirical study of measures of constructs from the cognitive domain, the personality domain, and the domain of affective traits, the authors of this study examine the implications of transient measurement error for the measurement of frequently studied individual differences variables. The authors clarify relevant reliability concepts as they relate to transient error and present a procedure for estimating the coefficient of equivalence and stability (L. J. Cronbach, 1947), the only classical reliability coefficient that assesses all 3 major sources of measurement error (random response, transient, and specific factor errors). The authors conclude that transient error exists in all 3 trait domains and is especially large in the domain of affective traits. Their findings indicate that the nearly universal use of the coefficient of equivalence (Cronbach's alpha; L. J. Cronbach, 1951), which fails to assess transient error, leads to overestimates of reliability and undercorrections for biases due to measurement error.
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Single-item scales tend to be unstable and susceptible to random response error.
“A further disadvantage of one-item scales is a tendency to be unstable and vulnerable to random response error (e.g., Nunnally & Bernstein, 1994; Schmidt, Le, & Ilies, 2003).”
From Dissociation and memory fragmentation in post-traumatic stress disorder: An evaluation of the dissociative encoding hypothesis (2012) · cites this paper as Schmidt, Le, & Ilies, 2003
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- Authors
- Schmidt, F. L., Le, H., & Ilies, R.
- Affiliations
- University of Iowa (US)
- Venue
- Psychological Methods
- Published
- 2003
- Volume
- 8
- Issue
- 2
- Pages
- 206-224
- ISSN
- 1082-989X (ISSN-L)
- 1939-1463
- OpenAlex
- W2049058583
- Cited by
- 362
- References
- 8
- Citations by year
- 2026: 12 · 2025: 12 · 2024: 14 · 2023: 21 · 2022: 15 · 2021: 23 · 2020: 22 · 2019: 22 · 2018: 28 · 2017: 22 · 2016: 22 · 2015: 19 · 2014: 25 · 2013: 12 · 2012: 13
- FWCI
- 12.53
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Psychological Methods (publishedVersion)
- PubMed (publishedVersion)
- Archivio istituzionale della Ricerca - Bocconi (submittedVersion)
- Topics
- Social Sciences › Decision Sciences › Management Science and Operations Research › Psychometric Methodologies and Testing
- Social Sciences › Decision Sciences › Statistics, Probability and Uncertainty › Reliability and Agreement in Measurement
- Social Sciences › Psychology › Applied Psychology › Psychological Testing and Assessment
- Keywords
- measurement error, reliability statistics, Cronbach's alpha, individual differences, personality traits, emotional characteristics, cognitive characteristics
- MeSH terms
- Humans, Individuality, Mathematics, Psychometrics, Research Design, Weights and Measures, Reproducibility of Results, Bias
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