ATa | IPb | KIc | Suggested cutoff | |
---|---|---|---|---|
Psychometric testing | ||||
Ceiling effects (%) | 1.3% | 2.0% | 39.9% | < 20 |
Floor effects (%) | 0.2% | 0.2% | 0 | < 20 |
Internal consistency (Cronbach’s α) | 0.460 | 0.760 | 0.869 | > 0.7 |
Confirmatory factor analysis | ||||
χ2 (df) | 66.372 (62) | - | - | Nonsignificant |
Comparative fit index | 0.998 | - | - | > 0.9 |
Tucker-Lewis index | 0.997 | - | - | > 0.9 |
Root-mean square error of Approximation | 0.011 (0.00–0.028) | - | - | < 0.08 |
Standardized Root Mean Squared Residual (SRMR) | 0.042 | - | - | < 0.08 |
Average Variance Extracted | 0.22 | 0.47 | 0.65 | > 0.5 |
Composite Reliability | 0.44 | 0.78 | 0.92 | > 0.6 |
Item separation reliability from Rasch | 1.00 | 0.96 | 0.95 | > 0.7 |
Item separation index from Rasch | 18.17 | 4.69 | 4.37 | > 2 |
Person separation reliability from Rasch | 0.70 | 0.71 | 0.54 | > 0.7 |
Person separation index from Rasch | 2.00 | 2.03 | 1.08 | > 2 |