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On Estimating the Reliability of Composite Indexes Through Factor Analysis

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  • Kent W. Smith

    (Department of Sociology Princeton University)

Abstract

The rationale for Heise and Bohrnstedt's index of reliability, omega, is restated in terms of the models of classical measurement theory and factor analysis. Although omega is the best available internal-consistency estimate of reliability, its value is generally lower than a composite scale's true reliability in the classical measurement model. Under quite foreseeable circumstances, it may be appreciably lower. Some implications for forming indexes through factor analysis are discussed.

Suggested Citation

  • Kent W. Smith, 1974. "On Estimating the Reliability of Composite Indexes Through Factor Analysis," Sociological Methods & Research, , vol. 2(4), pages 485-510, May.
    • Handle: RePEc:sae:somere:v:2:y:1974:i:4:p:485-510
    DOI: 10.1177/004912417400200405
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    References listed on IDEAS

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    1. Melvin Novick & Charles Lewis, 1967. "Coefficient alpha and the reliability of composite measurements," Psychometrika, Springer;The Psychometric Society, vol. 32(1), pages 1-13, March.
    2. Lee Cronbach, 1951. "Coefficient alpha and the internal structure of tests," Psychometrika, Springer;The Psychometric Society, vol. 16(3), pages 297-334, September.
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    3. Merlin Brinkerhoff & Jeffrey Jacob, 1986. "Quality of life in an alternative lifestyle: The smallholding movement," Social Indicators Research: An International and Interdisciplinary Journal for Quality-of-Life Measurement, Springer, vol. 18(2), pages 153-173, May.

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