Table 2 Descriptive statistics, reliability and discrimination estimates for Model 3
From: The reliability of the twelve-item general health questionnaire (GHQ-12) under realistic assumptions
Scoring method | Scale mean | Scale SD | Alpha (α) | Implied r 2 | Difference (α-implied r 2 ) | SEM | Delta (δ) |
|---|---|---|---|---|---|---|---|
Likert | 10.6 | 4.9 | 0.90 | 0.73 | 0.17 | 2.6 | 0.94 |
GHQ | 1.4 | 2.7 | 0.90 | 0.87 | 0.03 | 0.9 | 0.63 |
C-GHQ | 4.0 | 3.0 | 0.75 | 0.53 | 0.22 | 2.0 | 0.97 |