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Table 2 Confirmatory factor analysis fit indices and model-based omega coefficients

From: RETRACTED ARTICLE: Improving the measurement of alexithymia in autistic adults: a psychometric investigation and refinement of the twenty-item Toronto Alexithymia Scale

Index TAS-20 Bifactor: SPARK TAS-20 Bifactor: HPP TAS-11 Bifactor: SPARK TAS-11 Bifactor: HPP
Model fit indices
 χ2 (df)a 590.6 (145) 669.9 (145) 151.6 (33) 124.0 (33)
 CFIcML 0.924 0.900 0.970 0.978
 TLIcML 0.900 0.869 0.951 0.963
 RMSEAcML [90% CI] 0.072 [0.066, 0.078] 0.086 [0.081, 0.092] 0.080 [0.069, 0.092] 0.068 [0.056, 0.079]
 SRMRu [90% CI] 0.036 [0.033, 0.004] 0.051 [0.047, 0.056] 0.020 [0.017, 0.024] 0.019 [00.015, 0.023]
 WRMR 1.119 1.565 0.768 0.699
 |Residuals|> 0.1 2.60% 8.90% 0% 0%
 Largest residual 0.149 0.225 0.084 0.055
Bifactor coefficients
 ωT/ωH 0.912/0.773 0.914/0.741 0.929/0.861 0.925/0.952
 ωS/ωHS (DIF) 0.906/0.162 0.880/0.224 0.913/0.087 0.892/0.071
 ωS/ωHS (DDF) 0.854/0.145 0.803/0.120 0.800/0.163 0.839/0.223
 ωS/ωHS (EOT) 0.451/0.300 0.512/0.307
 ωS/ωHS (REV) 0.559/0.441 0.692/0.689
  1. Fit indices that above the a priori cutoffs for acceptable model fit (CFI/TLI > 0.95, RMSEA < 0.06, SRMR < 0.08, WRMR < 1, all residuals < 0.1) are presented in bold
  2. TAS Toronto Alexithymia Scale, SPARK Simons Powering Autism Research Knowledge, HPP Human Penguin Project, CFIcML comparative fit index (categorical maximum likelihood estimation), TLIcML Tucker–Lewis Index (categorical maximum likelihood estimation), RMSEAcML root mean square error of approximation (categorical maximum likelihood estimation), SRMRu population-unbiased standardized root mean square residual, WRMR weighted root mean square residual, ωT omega total (composite reliability of total score), ωH omega hierarchical (proportion of total score variance accounted for by general factor), ωS omega subscale (composite reliability of subscale score), ωHS omega hierarchical subscale (proportion of subscale score variance accounted for by specific factor), DIF difficulty identifying feelings, DDF difficulty describing feelings, EOT externally oriented thinking, REV reverse-coded item method factor
  3. aAll p values < 0.001