Items/testlets | Models/parameters | ||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Rasch IRT | Rasch MIRT | Rasch testlet | Confirmatory bifactor | Exploratory bifactor | |||||||||||
a | b | a | b | a | b | b | GFa | F1 | F2 | b | GF | F1 | F2 | ||
2016 Reading Comprehension Examination | |||||||||||||||
 1 | Testlet 1 | 0.99 | 1.51 | 0.61 | 1.60 | 0.91 | 1.45 | 1.72 | 0.49 | 0.43 | - | 1.74 | 0.46 | 0.06 | 0.47 |
 2 | 0.99 | 2.45 | 0.61 | 2.58 | 0.91 | 2.35 | 2.39 | 0.47 | 0.03 | - | 2.32 | 0.33 | 0.20 | 0.17 | |
 3 | 0.99 | 2.30 | 0.61 | 2.43 | 0.91 | 2.21 | 2.61 | 0.65 | 0.06 | - | 2.41 | 0.43 | 0.34 | 0.14 | |
 4 | 0.99 | 2.19 | 0.61 | 2.31 | 0.91 | 2.10 | 2.34 | 0.55 | 0.20 | - | 2.19 | 0.34 | 0.38 | 0.00 | |
 5 | 0.99 | 1.31 | 0.61 | 1.39 | 0.91 | 1.27 | 3.43 | 0.59 | 0.73 | - | 2.94 | 0.60 | − 0.01 | 0.70 | |
 6 | Testlet 2 | 0.99 | 2.39 | 0.52 | 2.40 | 0.95 | 2.31 | 2.56 | 0.54 | - | 0.25 | 2.55 | 0.45 | 0.35 | 0.15 |
 7 | 0.99 | 2.56 | 0.52 | 2.57 | 0.95 | 2.48 | 2.56 | 0.40 | - | 0.32 | 2.63 | 0.35 | 0.42 | − 0.02 | |
 8 | 0.99 | 2.11 | 0.52 | 2.12 | 0.95 | 2.04 | 1.20 | 0.34 | - | 0.25 | 2.04 | 0.29 | 0.36 | − 0.03 | |
 9 | 0.99 | 2.96 | 0.52 | 2.97 | 0.95 | 2.86 | 4.09 | 0.30 | - | 0.72 | 3.15 | 0.36 | 0.47 | − 0.07 | |
 10 | 0.99 | 1.87 | 0.52 | 1.88 | 0.95 | 1.81 | 1.81 | 0.30 | - | 0.35 | 1.77 | 0.28 | 0.32 | − 0.01 | |
2017 Reading Comprehension Examination | |||||||||||||||
 1 | Testlet 1 | 1.52 | 1.15 | 0.70 | 1.66 | 0.96 | 1.71 | 2.94 | 0.72 | 0.54 | - | 1.76 | 0.62 | 0.09 | 0.25 |
 2 | 1.52 | 1.65 | 0.70 | 2.41 | 0.96 | 2.45 | 2.08 | 0.40 | 0.22 | - | 2.03 | 0.38 | 0.04 | 0.17 | |
 3 | 1.52 | 2.14 | 0.70 | 3.15 | 0.96 | 3.17 | 2.91 | 0.53 | − 0.15 | - | 2.90 | 0.48 | 0.01 | 0.26 | |
 4 | 1.52 | 1.07 | 0.70 | 1.55 | 0.96 | 1.59 | 2.14 | 0.81 | − 0.10 | - | 1.93 | 0.72 | 0.12 | 0.27 | |
 5 | 1.52 | 1.52 | 0.70 | 2.21 | 0.96 | 2.25 | 2.41 | 0.70 | − 0.06 | - | 2.62 | 0.64 | − 0.04 | 0.39 | |
 6 | Testlet 2 | 1.52 | 1.49 | 0.84 | 2.35 | 0.94 | 2.20 | 2.12 | 0.58 | - | 0.19 | 2.13 | 0.57 | 0.16 | 0.15 |
 7 | 1.52 | 0.77 | 0.84 | 1.20 | 0.94 | 1.13 | 1.38 | 0.68 | - | 0.37 | 1.37 | 0.70 | 0.31 | 0.07 | |
 8 | 1.52 | 0.62 | 0.84 | 0.96 | 0.94 | 0.91 | 1.40 | 0.71 | - | 0.49 | 1.49 | 0.76 | 0.44 | − 0.03 | |
 9 | 1.52 | 1.16 | 0.84 | 1.83 | 0.94 | 1.71 | 1.73 | 0.57 | - | 0.33 | 1.73 | 0.59 | 0.27 | 0.05 | |
 10 | 1.52 | 1.36 | 0.84 | 2.14 | 0.94 | 2.00 | 1.86 | 0.47 | - | 0.33 | 1.83 | 0.50 | 0.24 | 0.04 | |
2018 Reading Comprehension Examination | |||||||||||||||
 1 | Testlet 1 | 1.53 | 0.47 | 0.75 | 0.70 | 0.96 | 0.71 | 0.64 | 0.46 | 0.32 | - | 0.63 | 0.50 | − 0.04 | 0.23 |
 2 | 1.53 | 0.79 | 0.75 | 1.18 | 0.96 | 1.18 | 1.42 | 0.72 | 0.29 | - | 1.42 | 0.73 | 0.04 | 0.24 | |
 3 | 1.53 | 1.04 | 0.75 | 1.56 | 0.96 | 1.57 | 1.39 | 0.49 | 0.24 | - | 1.40 | 0.51 | 0.00 | 0.20 | |
 4 | 1.53 | 1.11 | 0.75 | 1.66 | 0.96 | 1.67 | 1.89 | 0.69 | 0.27 | - | 1.88 | 0.71 | 0.06 | 0.21 | |
 5 | 1.53 | 0.74 | 0.75 | 1.10 | 0.96 | 1.11 | 1.15 | 0.61 | 0.31 | - | 1.16 | 0.64 | − 0.01 | 0.26 | |
 6 | Testlet 2 | 1.53 | 1.16 | 0.88 | 1.89 | 0.94 | 1.74 | 1.86 | 0.69 | - | 0.14 | 1.87 | 0.66 | 0.25 | 0.01 |
 7 | 1.53 | 1.19 | 0.88 | 1.94 | 0.94 | 1.78 | 1.95 | 0.72 | - | 0.08 | 1.97 | 0.68 | 0.25 | 0.01 | |
 8 | 1.53 | 0.36 | 0.88 | 0.58 | 0.94 | 0.53 | 0.63 | 0.75 | - | − 0.14 | 0.58 | 0.68 | 0.17 | 0.09 | |
 9 | 1.53 | 0.89 | 0.88 | 1.45 | 0.94 | 1.33 | 2.22 | 0.85 | - | 0.26 | 2.07 | 0.81 | 0.32 | 0.00 | |
 10 | 1.53 | 2.19 | 0.88 | 3.56 | 0.94 | 3.26 | 2.83 | 0.46 | - | 0.08 | 2.83 | 0.44 | 0.15 | 0.02 |