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Title: Confirmatory Factor Analysis and further validation of the Comprehensive assessment of Acceptance and Commitment Therapy processes (CompACT)
Author: Bayliss, Katrina
ISNI:       0000 0004 7959 8235
Awarding Body: University of Nottingham
Current Institution: University of Nottingham
Date of Award: 2018
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The current research provides further testing and validation of the newly developed Acceptance and Commitment Therapy (ACT) measure: Comprehensive assessment of Acceptance and Commitment Therapy (CompACT- Francis et al., 2016). To further evaluate the psychometric robustness of the CompACT the current research: (1) completed an intercorrelated and bifactor confirmatory factor analysis (CFA) of the previously identified three-factor structure; (2) retested the psychometric properties (reliability and validity indicators) in an independent sample (n=313); (3) tested the CompACT's stability over a two-week period (test-retest reliability); and (4) tested the ability to distinguish groups based on clinical screening criteria for distress (CompACT clinical cut-offs). Further testing was then carried out to explore and confirm the construct of the CompACT which included: unidimensional analysis and hierarchical analysis. Both intercorrelated and bifactor analyses in the main study yielded an acceptable model fit confirming the three-factor structure of the CompACT. Test-retest data (n=112) confirmed stability over a two-week period (r = .88) indicating a large effect. Clinical cut-off data was also analysed, which offered preliminary findings for scores indicative of low psychological flexibility. Regression analysis suggested that scores of 85 and below on the CompACT, within this dataset, were indicative of low psychological flexibility. Further CFA testing suggested that the bifactor model produced the best fitting model overall. However, taking into consideration ACT theoretical conceptualisations and a priori assumptions, it was concluded that the intercorrelated CFA analysis was most representative of the CompACT structure. This study supports the three-factor model of the CompACT and provides further evidence that it is a useful, reliable, stable and robust tool within the ACT field, for research and clinical practice.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (D.Clin.Psy.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: WM Psychiatry