Unidimensionality | ||||
---|---|---|---|---|
Approach | Criterion | Reference | Results | Criterion met? |
EFA | Percentage of variance accounted for by first factor > 20% | PROMIS [16] | 18.1% | No |
Ratio of first to second eigenvalues > 4.0 | PROMIS [16] | 8.01 | Yes | |
CFA | CFI > 0.95 | PROMIS [16] | 0.923 | No |
TLI > 0.95 | PROMIS [16] | 0.917 | No | |
RMSEA < 0.06 | PROMIS [16] | 0.098 | No | |
SRMR < 0.08 | PROMIS [16] | 0.081 | No | |
Bifactor analyses | ARPB < 10% | Muthén, Kaplan, and Hollis (1987) [33] | 3.6%§ | Yes |
General ECV > 0.70 | Reise, Bonifay and Haviland (2013) [17] | 0.805ǂ | Yes | |
OmegaH > 0.80 | 0.980¥ | Yes | ||
General ECV > 0.60 and OmegaH> 0.70 | Reise, Schienes, Widaman and Haviland (2013) [15] | Yes | ||
Local Independence | ||||
Residual correlation matrix | Average absolute residual correlations < 0.10 | PROMIS[16] | 0.067 | Yes |
Percentage of residual correlations above 0.20 | Artmann et al. 2010 [18] | 1.84% | No threshold given | |
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