Table 4.
IRT parameter estimates for Verbal and Matrix Reasoning
| Item | Parameter Estimates | |||
|---|---|---|---|---|
| a | B | g | u | |
| VR 1 | 0.65 | −6.23 | 0 | 1 |
| VR 2 | 1.52 | −2.32 | 0 | 1 |
| VR 3 | 0.57 | −2.90 | 0 | 1 |
| VR 4 | 1.18 | −2.41 | 0 | 1 |
| VR 5 | 1.29 | −0.55 | 0 | 1 |
| VR 6 | 2.09 | −0.62 | 0 | 1 |
| VR 7 | 0.98 | −0.30 | 0 | 1 |
| VR 8 | 2.70 | −0.41 | 0 | 1 |
| VR 9 | 1.43 | −0.12 | 0 | 1 |
| VR 10 | 0.95 | −2.95 | 0 | 1 |
| VR 11 | 1.04 | 0.31 | 0 | 1 |
| VR 12 | 1.87 | −0.70 | 0 | 1 |
| VR 13 | 1.07 | 0.75 | 0 | 1 |
| VR 14 | 0.79 | −0.85 | 0 | 1 |
| VR 15 | 0.46 | 2.22 | 0 | 1 |
| VR 16 | 1.08 | 2.01 | 0 | 1 |
| MR 1 | 0.69 | −0.07 | .13 | .95 |
| MR 2 | 2.11 | −0.90 | .09 | .86 |
| MR 3 | 2.28 | −1.43 | .11 | .96 |
| MR 4 | 2.45 | −2.11 | .12 | .98 |
| MR 5 | 1.40 | 2.49 | .26 | .95 |
| MR 6 | 1.80 | −.865 | .13 | .97 |
| MR 7 | 2.19 | 0.38 | .10 | .88 |
| MR 8 | 1.62 | −0.10 | .09 | .92 |
| MR 9 | 3.34 | −0.84 | .10 | .99 |
| MR 10 | 2.11 | −0.74 | .13 | .98 |
| MR 11 | 3.53 | −0.97 | .10 | .98 |
| MR 12 | 3.09 | −0.06 | .14 | .98 |
| MR 13 | 2.65 | 1.02 | .11 | .90 |
| MR 14 | 3.31 | −0.85 | .12 | .99 |
| MR 15 | 2.33 | −0.64 | .15 | .98 |
| MR 16 | 2.38 | −0.06 | .12 | .97 |
| MR 17 | 2.59 | 0.65 | .12 | .92 |
| MR 18 | 2.52 | −0.10 | .11 | .97 |
| MR 19 | 2.72 | 0.93 | .14 | .97 |
| MR 20 | 3.29 | 0.58 | .12 | .98 |
| MR 22 | 0.72 | 1.67 | .15 | .95 |
| MR 23 | 3.11 | 1.56 | .10 | .95 |
| MR 24 | 1.81 | 1.16 | .13 | .95 |
| MR 26 | 1.52 | 2.03 | .12 | .95 |
| MR 27 | 0.83 | 1.47 | .12 | .95 |
| MR 28 | 4.22 | 0.78 | .12 | .97 |
| MR 29 | 1.40 | −0.13 | .15 | .97 |
| MR 30 | 1.47 | 1.08 | .13 | .96 |
Note: a = discrimination, b = difficulty, g = guessing parameter, and u = upper bound. Based on model comparison results, the guessing parameter g and upper bound parameter u was fixed for all Verbal Reasoning items.