141 A APPENDIX C Item f it for the IRT model Table C1 Group-level observed average scores and expected average scores based on the Impact! results Low-Scores Group Intermediate Group High-Scores Group Absolute Item Observed Expected Observed Expected Observed Expected Difference 1 0.73 0.70 1.04 1.07 1.57 1.57 0.02 2 0.65 0.64 1.06 1.06 1.61 1.61 0.01 3 0.59 0.57 0.95 0.96 1.50 1.50 0.01 4 0.37 0.39 0.83 0.80 1.42 1.43 0.02 5 0.41 0.42 0.77 0.74 1.25 1.28 0.02 6 0.59 0.58 1.04 1.03 1.57 1.58 0.01 7 0.58 0.56 0.95 0.96 1.50 1.51 0.01 8 0.76 0.73 1.06 1.08 1.54 1.54 0.02 9 0.61 0.60 1.06 1.05 1.62 1.63 0.01 10 0.70 0.66 1.03 1.07 1.61 1.59 0.03 11 0.78 0.76 1.07 1.10 1.55 1.54 0.02 12 0.50 0.49 0.91 0.91 1.50 1.50 0.00 13 0.76 0.74 1.05 1.08 1.54 1.53 0.02 14 0.26 0.26 0.53 0.49 1.03 1.06 0.02 15 0.81 0.76 1.09 1.13 1.59 1.60 0.03
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