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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 Permitted [R3]): 2000

NAEP Technical DocumentationIRT parameters for the reading for literary experience scale, by block and item, grade 4 reading national main assessment (accommodations permitted [R3]): 2000

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2	dj3
R3	1A	R017001	0.601	-0.877	0.000	†	†	†
	2	R017002	1.539	-0.458	0.203	†	†	†
	3A	R017003	0.494	0.342	0.000	0.125	-0.125	†
	4A	R017004	0.908	0.908	0.000	†	†	†
	5	R017005	0.677	0.677	0.224	†	†	†
	6A	R017006	1.031	1.046	0.000	†	†	†
	7A	R017007	0.630	0.447	0.000	0.277	0.200	-0.477
	8	R017008	1.254	0.504	0.167	†	†	†
	9A	R017009	0.529	-0.210	0.000	1.659	-1.659	†
R4	1	R012101	1.847	-0.887	0.281	†	†	†
	2A	R012102	0.685	-0.038	0.000	†	†	†
	3	R012103	1.402	-0.446	0.171	†	†	†
	4A	R012104	0.765	-0.359	0.000	†	†	†
	5	R012105	1.002	0.137	0.221	†	†	†
	6A	R012106	0.970	0.113	0.000	†	†	†
	7	R012107	1.477	0.314	0.272	†	†	†
	8A	R012108	0.581	-1.150	0.000	†	†	†
	9A	R012109	0.532	-1.285	0.000	†	†	†
	10	R012110	0.853	-1.010	0.267	†	†	†
	11A	R012111	1.081	1.200	0.000	0.801	-0.801	†
	12A	R012112	0.677	-0.546	0.000	†	†	†
R5	1A	R012601	0.929	1.033	0.000	†	†	†
	2	R012602	1.548	1.124	0.154	†	†	†
	3	R012603	1.736	0.167	0.260	†	†	†
	4A	R012604	1.209	0.959	0.000	†	†	†
	5	R012605	1.058	0.897	0.283	†	†	†
	6	R012606	1.452	0.320	0.280	†	†	†
	7A	R012607	1.187	1.051	0.000	0.684	-0.148	-0.536
	8	R012608	0.535	-0.870	0.230	†	†	†
	9	R012609	1.085	0.762	0.236	†	†	†
	10	R012610	1.430	0.413	0.329	†	†	†
	11A	R012611	0.774	0.369	0.000	†	†	†
R9	1	R015801	1.068	-1.253	0.198	†	†	†
	2A	R015802	0.531	-1.173	0.000	†	†	†
	3A	R015803	0.585	-0.194	0.000	1.323	-1.323	†
	4A	R015804	0.662	0.614	0.000	2.124	-0.591	-1.533
	5	R015805	1.174	0.266	0.262	†	†	†
	6A	R015806	0.781	0.149	0.000	1.007	-1.007	†
	7A	R015807	0.576	0.013	0.000	0.711	-0.711	†
	8	R015808	0.796	-1.004	0.297	†	†	†
	9A	R015809	0.672	0.130	0.000	1.342	-1.342	†
† 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.

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