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NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Assessment IRT Parameters → Reading Assessment IRT Parameters → IRT Parameters for the Reading for Literary Experience Scale, by Block and Item, Grade 4 Reading National Main Assessment (Accommodations Not Permitted [R2]): 2000
NAEP Technical DocumentationIRT parameters for the reading for literary experience scale, by block and item, grade 4 reading national main assessment (accommodations not permitted [R2]): 2000
Block Item NAEP ID aj bj cj dj1 dj2 dj3
R3 1A R017001 0.622 -0.896 0.000 † † †
2 R017002 1.386 -0.586 0.182 † † †
3A R017003 0.463 0.306 0.000 0.155 -0.155 †
4A R017004 0.895 0.916 0.000 † † †
5 R017005 0.683 0.813 0.280 † † †
6A R017006 0.936 1.064 0.000 † † †
7A R017007 0.589 0.418 0.000 0.311 0.194 -0.505
8 R017008 1.224 0.498 0.181 † † †
9A R017009 0.489 -0.270 0.000 1.817 -1.817 †
R4 1 R012101 1.801 -0.936 0.227 † † †
2A R012102 0.700 -0.027 0.000 † † †
3 R012103 1.382 -0.431 0.208 † † †
4A R012104 0.762 -0.384 0.000 † † †
5 R012105 1.038 0.178 0.231 † † †
6A R012106 0.948 0.114 0.000 † † †
7 R012107 1.459 0.264 0.248 † † †
8A R012108 0.561 -1.180 0.000 † † †
9A R012109 0.494 -1.406 0.000 † † †
10 R012110 0.820 -1.024 0.317 † † †
11A R012111 1.048 1.226 0.000 0.844 -0.844 †
12A R012112 0.685 -0.560 0.000 † † †
R5 1A R012601 0.850 1.079 0.000 † † †
2 R012602 1.419 1.160 0.153 † † †
3 R012603 1.710 0.173 0.272 † † †
4A R012604 1.082 0.992 0.000 † † †
5 R012605 1.072 0.926 0.290 † † †
6 R012606 1.348 0.267 0.244 † † †
7A R012607 1.174 1.070 0.000 0.708 -0.135 -0.572
8 R012608 0.495 -0.847 0.270 † † †
9 R012609 1.021 0.792 0.238 † † †
10 R012610 1.451 0.463 0.354 † † †
11A R012611 0.742 0.362 0.000 † † †
R9 1 R015801 0.942 -1.416 0.245 † † †
2A R015802 0.504 -1.262 0.000 † † †
3A R015803 0.586 -0.248 0.000 1.373 -1.373 †
4A R015804 0.626 0.632 0.000 2.221 -0.616 -1.604
5 R015805 1.075 0.285 0.273 † † †
6A R015806 0.690 0.074 0.000 1.169 -1.169 †
7A R015807 0.548 -0.056 0.000 0.779 -0.779 †
8 R015808 0.788 -0.952 0.336 † † †
9A R015809 0.651 0.095 0.000 1.376 -1.376 †
† Not applicable; the number of item parameters estimated depends upon the IRT model used for scaling.
NOTE: For item j, aj represents the discriminatory power of the item, bj represents a location parameter related to item difficulty, cj represents the guessing parameter, and dji is the category threshold parameter for category i. The c-parameter value is exactly zero for items scaled with the two-parameter logistic model or the generalized partial credit model.
SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2000 Reading Assessment.
Last updated 14 July 2008 (KL)

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