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Coefficient Alpha: The Resistance of a Classic
Eduardo Doval1, Carme Viladrich, Ariadna Angulo-Brunet
1Universitat Autònoma de Barcelona.
Psicothema
|January 25, 2023
Summary
The alpha coefficient (α) and omega coefficient (ω) are both suitable for estimating internal consistency reliability under specific conditions. Careful consideration of item properties and model fit is recommended for accurate reliability estimation.
Area of Science:
- Psychometrics
- Educational Measurement
- Statistical Modeling
Background:
- The alpha coefficient (α) was historically dominant for internal consistency reliability.
- Misuse led to the rise of alternatives like the omega coefficient (ω).
- Current trends show a resurgence in the acceptance of α for reliability estimation.
Conclusions:
- The choice between α and ω depends on data characteristics and measurement model fit.
- Variants of ω offer greater flexibility for complex data structures.
- A critical approach to software implementation is advised for reliable results.
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