Item difficulty, discrimination and confidence-related indices (n = 238)
| Item | Facility index (FI) (% correct) | Discrimination index (DI) | Confidence | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Content | Both tiers | Content | Both tiers | CF | CFC | CFW | CAQ | CB | |
| 1 | 0.4 | – | 0.02 | – | 3.63 | – | – | – | – |
| 2 | 50.8 | – | 0.28 | – | 4.04 | 4.25 | 3.82 | 0.33 | – |
| 3 | 59.7 | – | 0.59 | – | 4.10 | 4.30 | 3.79 | 0.33 | – |
| 4 | 50.8 | – | 0.30 | – | 4.35 | 4.28 | 4.43 | −0.08 | – |
| 5 | 58.4 | – | 0.66 | – | 4.59 | 5.01 | 3.99 | 0.49 | – |
| 6 | 27.7 | – | 0.56 | – | 4.08 | 4.94 | 3.74 | 0.65 | – |
| 7 | 43.7 | – | 0.56 | – | 3.99 | 4.47 | 3.62 | 0.46 | – |
| 8 | 45.8 | – | 0.64 | – | 4.13 | 4.67 | 3.67 | 0.54 | – |
| 9 | 55.5 | – | 0.30 | – | 4.13 | 4.12 | 4.14 | −0.01 | – |
| 10.a | 96.2 | – | 0.10 | – | 4.14 | – | – | – | – |
| 10.b | 85.3 | – | 0.26 | – | 4.14 | – | – | – | – |
| 10.c | 94.5 | – | 0.11 | – | 4.14 | – | – | – | – |
| 10.d | 79.4 | – | 0.19 | – | 4.14 | – | – | – | – |
| 10.e | 97.9 | – | 0.06 | – | 4.14 | – | – | – | – |
| 10.f | 73.9 | – | 0.22 | – | 4.14 | – | – | – | – |
| 10.g | 59.7 | – | 0.21 | – | 4.14 | – | – | – | – |
| 10.h | 76.5 | – | 0.27 | – | 4.14 | – | – | – | – |
| 11 | 44.5 | 28.2 | 0.61 | 0.50 | 4.04 | 4.45 | 3.88 | 0.38 | 0.15 |
| 12 | 54.6 | 31.9 | 0.53 | 0.44 | 3.94 | 4.50 | 3.78 | 0.50 | 0.10 |
| 13 | 56.7 | 17.6 | 0.40 | 0.29 | 3.94 | 4.33 | 3.89 | 0.31 | 0.22 |
| 14 | 38.7 | 34.9 | 0.43 | 0.35 | 3.76 | 3.95 | 3.77 | 0.12 | 0.06 |
| 15.a | 84.9 | – | 0.35 | – | – | – | – | – | – |
| 15.b | 68.9 | – | 0.29 | – | – | – | – | – | – |
| 15.c | 72.3 | – | 0.45 | – | – | – | – | – | – |
| 15.d | 54.2 | – | 0.42 | – | – | – | – | – | – |
| 15.e | 15.1 | – | −0.05 | – | – | – | – | – | – |
| 15.f | 62.6 | – | 0.30 | – | – | – | – | – | – |
| 15.g | 25.6 | – | 0.27 | – | – | – | – | – | – |
| 15.h | 7.6 | – | −0.05 | – | – | – | – | – | – |
| 16.a | 87.8 | – | 0.16 | – | 3.99 | – | – | – | – |
| 16.b | 44.5 | – | 0.54 | – | 3.99 | – | – | – | – |
| 16.c | 93.3 | – | 0.14 | – | 3.99 | – | – | – | – |
| 16.d | 12.2 | 3.4 | 0.07 | 0.00 | 3.73 | 2.63 | 3.78 | −0.78 | 0.36 |
| 16.e | 87.8 | 25.2 | 0.23 | 0.16 | 3.74 | 3.92 | 3.76 | 0.11 | 0.14 |
| 16.f | 75.6 | – | 0.26 | – | 3.99 | – | – | – | – |
| 16.g | 52.5 | – | 0.20 | – | 3.99 | – | – | – | – |
| 16.h | 43.7 | – | 0.25 | – | 3.99 | – | – | – | – |
| Mean | 57.8 | 23.2 | 0.30 | 0.32 | 4.04 | 4.27 | 3.86 | 0.24 | 0.17 |
| SD | 25.7 | 12.9 | 0.19 | 0.19 | 0.19 | 0.57 | 0.21 | 0.36 | 0.11 |
| Item | Facility index ( | Discrimination index ( | Confidence | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Content | Both tiers | Content | Both tiers | ||||||
| 1 | 0.4 | – | 0.02 | – | 3.63 | – | – | – | – |
| 2 | 50.8 | – | 0.28 | – | 4.04 | 4.25 | 3.82 | 0.33 | – |
| 3 | 59.7 | – | 0.59 | – | 4.10 | 4.30 | 3.79 | 0.33 | – |
| 4 | 50.8 | – | 0.30 | – | 4.35 | 4.28 | 4.43 | −0.08 | – |
| 5 | 58.4 | – | 0.66 | – | 4.59 | 5.01 | 3.99 | 0.49 | – |
| 6 | 27.7 | – | 0.56 | – | 4.08 | 4.94 | 3.74 | 0.65 | – |
| 7 | 43.7 | – | 0.56 | – | 3.99 | 4.47 | 3.62 | 0.46 | – |
| 8 | 45.8 | – | 0.64 | – | 4.13 | 4.67 | 3.67 | 0.54 | – |
| 9 | 55.5 | – | 0.30 | – | 4.13 | 4.12 | 4.14 | −0.01 | – |
| 10.a | 96.2 | – | 0.10 | – | 4.14 | – | – | – | – |
| 10.b | 85.3 | – | 0.26 | – | 4.14 | – | – | – | – |
| 10.c | 94.5 | – | 0.11 | – | 4.14 | – | – | – | – |
| 10.d | 79.4 | – | 0.19 | – | 4.14 | – | – | – | – |
| 10.e | 97.9 | – | 0.06 | – | 4.14 | – | – | – | – |
| 10.f | 73.9 | – | 0.22 | – | 4.14 | – | – | – | – |
| 10.g | 59.7 | – | 0.21 | – | 4.14 | – | – | – | – |
| 10.h | 76.5 | – | 0.27 | – | 4.14 | – | – | – | – |
| 11 | 44.5 | 28.2 | 0.61 | 0.50 | 4.04 | 4.45 | 3.88 | 0.38 | 0.15 |
| 12 | 54.6 | 31.9 | 0.53 | 0.44 | 3.94 | 4.50 | 3.78 | 0.50 | 0.10 |
| 13 | 56.7 | 17.6 | 0.40 | 0.29 | 3.94 | 4.33 | 3.89 | 0.31 | 0.22 |
| 14 | 38.7 | 34.9 | 0.43 | 0.35 | 3.76 | 3.95 | 3.77 | 0.12 | 0.06 |
| 15.a | 84.9 | – | 0.35 | – | – | – | – | – | – |
| 15.b | 68.9 | – | 0.29 | – | – | – | – | – | – |
| 15.c | 72.3 | – | 0.45 | – | – | – | – | – | – |
| 15.d | 54.2 | – | 0.42 | – | – | – | – | – | – |
| 15.e | 15.1 | – | −0.05 | – | – | – | – | – | – |
| 15.f | 62.6 | – | 0.30 | – | – | – | – | – | – |
| 15.g | 25.6 | – | 0.27 | – | – | – | – | – | – |
| 15.h | 7.6 | – | −0.05 | – | – | – | – | – | – |
| 16.a | 87.8 | – | 0.16 | – | 3.99 | – | – | – | – |
| 16.b | 44.5 | – | 0.54 | – | 3.99 | – | – | – | – |
| 16.c | 93.3 | – | 0.14 | – | 3.99 | – | – | – | – |
| 16.d | 12.2 | 3.4 | 0.07 | 0.00 | 3.73 | 2.63 | 3.78 | −0.78 | 0.36 |
| 16.e | 87.8 | 25.2 | 0.23 | 0.16 | 3.74 | 3.92 | 3.76 | 0.11 | 0.14 |
| 16.f | 75.6 | – | 0.26 | – | 3.99 | – | – | – | – |
| 16.g | 52.5 | – | 0.20 | – | 3.99 | – | – | – | – |
| 16.h | 43.7 | – | 0.25 | – | 3.99 | – | – | – | – |
Sharing content requires targeting cookies to be enabled. Please update your cookie preferences to use this feature.