Table 2 Estimates for one-factor model (UIRT)
Item | Discrimination (slope) | Severity (threshold) | |||
|---|---|---|---|---|---|
Item no. | a | b1 | b2 | b3 | b4 |
Item 1 | 0.61 | 0.71 | 2.17 | 4.49 | 6.99 |
Item 2 | 0.47 | 2.30 | 3.97 | 5.47 | 7.42 |
Item 3 | 1.01 | − 3.33 | − 2.83 | − 2.03 | − 0.02 |
Item 4 | 0.49 | 1.07 | 3.27 | 6.62 | 11.19 |
Item 5 | 0.29 | 0.62 | 2.84 | 6.88 | 12.40 |
Item 6 | 0.42 | 2.73 | 4.32 | 6.01 | 8.29 |
Item 7 | 0.64 | − 3.28 | − 1.70 | 0.87 | 3.70 |
Item 8 | 0.75 | − 2.05 | − 1.08 | 1.25 | 3.74 |
Item 9 | 1.89 | − 1.07 | − 0.12 | 0.95 | 2.25 |
Item 10 | 2.61 | − 0.89 | − 0.33 | 0.67 | 1.76 |
Item 11 | 1.69 | − 0.93 | − 0.19 | 0.79 | 1.89 |
Item 12 | 2.07 | − 1.56 | − 0.77 | 0.41 | 1.62 |
Item 13 | 0.97 | − 0.16 | 0.54 | 1.70 | 3.03 |