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Evidence for a Bifactor Structure of the Scales of Psychological Well-Being Using Exploratory Structural Equation Modeling

  • Original Research
  • Published:
Journal of Well-Being Assessment

Abstract

This research investigates the much-debated factor structure of the 54-item version of Ryff’s (1989) Scales of Psychological Well-being (SPWB). Using two samples (n1 = 573; n2 = 449) of undergraduate university students, we apply confirmatory factor analysis (CFA) along with recently developed exploratory structural equation modeling (ESEM) techniques to evaluate several unidimensional and multidimensional models identified in previous research, as well as a new bifactor model. In a bifactor model, items load directly on both a global and a specific factor; when tested using ESEM, cross-loadings on other specific factors are also permitted and are targeted to be as close to zero as possible. After comparing various ESEM and traditional CFA models, the results indicate that a bifactor model estimated using ESEM provided the best fit to the data. Most items were found to reflect the global factor, but some items failed to reflect the intended specific factor. Thus, the 54-item version of the SPWB appears to be a good measure of overall psychological well-being, but may need refinement as a measure of the intended specific factors, at least among young adults. The benefits of applying ESEM to investigate the factor structure of the SPWB in other populations are discussed.

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Notes

  1. For completeness, hierarchical 3- and 6-factor CFA models were also estimated. However, these models provided a poorer fit to the data than the corresponding non-hierarchical CFA models. For this reason, and because these models often involve unrealistic assumptions (e.g., Morin et al. 2016; Reise 2012), they are not reported in the Results but are available from the first author upon request.

  2. In the past, some investigators have reported that fit improves in models allowing correlations among the residuals for adjacent items and/or by allowing negatively worded items to load on a method factor (e.g., Springer and Hauser 2006). Due to the complexity of the ESEM models tested here (e.g., 6-bifactor model), we did not use either of these procedures to account for potential method variance. However, inspection of the modification indices provided by Mplus suggested that applications of these procedures would be unlikely to improve model fit substantially. Details regarding these modification indices can be found in Online Resource 2.

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Acknowledgements

This research was supported by a research grant from the Social Sciences and Humanities Research Council (435-2014-0956) awarded to the second author.

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Correspondence to Jose A. Espinoza.

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On behalf of all authors, the corresponding author states that there is no conflict of interest.

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Appendix

Appendix

Table 3 Proposed item selection for refined versions of Ryff’s (1989) 9-item scales of psychological well-being

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Espinoza, J.A., Meyer, J.P., Anderson, B.K. et al. Evidence for a Bifactor Structure of the Scales of Psychological Well-Being Using Exploratory Structural Equation Modeling. J well-being assess 2, 21–40 (2018). https://doi.org/10.1007/s41543-018-0008-y

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