Analyses | Outcome | Result |
---|---|---|
IRT assumptions and model fit | ||
Confirmatory Factor Analysis of one-factor model | Chi square | 5964.333 |
df | 989 | |
p-value | 0.000 | |
Scaled CFI | 0.93 | |
Scaled TLI | 0.93 | |
Scaled RMSEA (90% CI) | 0.099 (0.097–0.101) | |
Scaled SRMR | 0.09 | |
Exploratory Factor Analysis | Eigenvalue first factor | 30.1 |
Eigenvalue second factor | 2.8 | |
Ratio | 10.7 | |
Exploratory bi-factor analysis | ECV | 0.68 |
Omega-H | 0.80 | |
Local Dependency | Residual correlation > 0.17 | 4 item pairs locally dependent (3.3%) |
Monotonicity | Scalability coefficient H | 0.63 |
Scalability coefficients Hi | Range 0.55–0.70 |