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How many factors in factor analysis? New insights about parallel analysis with confidence intervals

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  • Iacobucci, Dawn
  • Ruvio, Ayalla
  • Román, Sergio
  • Moon, Sangkil
  • Herr, Paul M.

Abstract

Factor analysis is an extremely popular model for scale development prior to other modeling in much research in business and the social sciences. A central question in factor analysis remains the determination of the number of factors to extract and retain to explain as much of the data as possible, and do so parsimoniously. Parallel analysis can be helpful, but there is some confusion surrounding this technique, which may lead to incorrect conclusions. This research seeks first to clarify and correct these confusions. Second, we offer R, SAS, and SPSS programs to conduct parallel analysis in factor analysis. Third, we incorporate inferential statistics, enabling hypothesis testing and confidence intervals. Finally, we discuss how parallel analysis can help scholars in ongoing debates about individual differences scales, construct and measure dimensionality, and the utility of multi-item scales. Hopefully, the recurrent question, “How many factors?” can be answered more definitively.

Suggested Citation

  • Iacobucci, Dawn & Ruvio, Ayalla & Román, Sergio & Moon, Sangkil & Herr, Paul M., 2022. "How many factors in factor analysis? New insights about parallel analysis with confidence intervals," Journal of Business Research, Elsevier, vol. 139(C), pages 1026-1043.
    • Handle: RePEc:eee:jbrese:v:139:y:2022:i:c:p:1026-1043
    DOI: 10.1016/j.jbusres.2021.09.015
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    References listed on IDEAS

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