| Item Fit Residual | Person Fit Residual | Chi Square Interaction | PSI | Unidimensionality T-Tests (CI) | |||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | Analysis | Number of items | valid n | Mean | SD | Mean | SD | Value | df | p | with extrms | NO extrms | % | lower bound 95% CI |
Optimism Sample 0 | Initial | 15 + 1 | 521 | 1.25 | 2.87 | −0.21 | 1.38 | 393.3 | 144 | > 0.001 | 0.85 | 0.84 | 5.8% | 3.9% |
Final | 10 | 518 | 0.71 | 0.74 | −0.37 | 1.46 | 96.0 | 80 | 0.11 | 0.75 | 0.72 | 5.8% | 3.9% | |
Optimism Sample 1 | Initial | 15 + 1 | 517 | 1.33 | 2.58 | −0.21 | 1.47 | 411.5 | 144 | > 0.001 | 0.86 | 0.84 | 7.2% | 5.3% |
Final | 10 | 516 | 0.54 | 1.01 | −0.37 | 1.44 | 74.7 | 80 | 0.65 | 0.77 | 0.73 | 4.8% | 3.0% | |
Protective Self-Worth Sample 0 | Initial | 12 + 1 | 518 | 1.18 | 2.21 | −0.15 | 1.36 | 228.5 | 117 | > 0.001 | 0.75 | 0.71 | 4.8% | 3.0% |
Final | 9 | 509 | 0.54 | 1.13 | −0.28 | 1.25 | 90.3 | 81 | 0.22 | 0.65 | 0.60 | 2.4% | 0.5% | |
Protective Self-Worth Sample 1 | Initial | 12 + 1 | 522 | 1.10 | 2.08 | −0.15 | 1.37 | 246.9 | 117 | > 0.001 | 0.73 | 0.69 | 5.2% | 3.3% |
Final | 9 | 511 | 0.68 | 1.55 | −0.30 | 1.33 | 111.9 | 81 | 0.01 | 0.64 | 0.56 | 1.8% | – | |
 | Ideal Values |  | 0 | 1 | 0 | 1 |  |  | > 0.05 | > 0.85 | > 0.85 | < 5% | < 5% | |
 |  |  |  |  |  |  |  |  |  |  | > 0.7 | > 0.7 |  |  |