Table 2.
Unidimensional Modeling and Analyses for TBI-CareQOL Military Health Care Frustration Item Pool
| Unidimensional Modeling | Initial Item Performance | IRT Modeling | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Domain | Item pool | EFA E1/E2 ratio (criterion >4) | Percent of variance for E1 (criterion >40) |
1-factor CFA loading (criterion <.50) |
1-factor CFA residual correlation (criterion >.20) |
1-factor CFA modification index (criterion >100) | Item-adjusted total score correlations (Criterion <.40) |
Sparse cells (criterion<10) |
Problems with monotonicity | IRT item misfit | DIF | Interim/Final item bank |
| Military Health Care Frustration | 64 items |
13.4 | 62.3 | 0 items |
4 items |
1 item |
0 items |
1 item |
0 items |
15 items |
0 items |
43 items |
Note. CFA = Confirmatory Factor Analysis; EFA = Exploratory Factor Analysis; IRT = Item Response Theory