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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 to Gain Information Scale, by Block and Item, Grade 4 Reading National Main Assessment (Accommodations Not Permitted [R2]): 2000

NAEP Technical DocumentationIRT parameters for the reading to gain information 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
R6	1A	R017301	0.800	-1.227	0.000	†	†	†
	2	R017302	1.302	-0.371	0.243	†	†	†
	3A	R017303	0.762	-0.060	0.000	0.579	-0.579	†
	4	R017304	1.241	0.093	0.287	†	†	†
	5A	R017305	1.087	-0.286	0.000	†	†	†
	6	R017306	1.143	-0.228	0.265	†	†	†
	7A	R017307	0.721	0.996	0.000	1.041	-0.158	-0.883
	8	R017308	1.171	-0.159	0.251	†	†	†
	9A	R017309	0.524	0.055	0.000	0.533	-0.533	†
R7	1	R012701	1.120	-0.133	0.306	†	†	†
	2A	R012702	0.595	-1.121	0.000	†	†	†
	3A	R012703	1.051	0.618	0.000	†	†	†
	4	R012704	1.176	0.829	0.133	†	†	†
	5A	R012705	1.435	1.167	0.000	†	†	†
	6A	R012706	0.595	1.191	0.000	†	†	†
	7	R012707	2.206	0.348	0.249	†	†	†
	8A	R012708	0.613	1.840	0.000	1.487	0.390	-1.877
	9	R012709	0.607	-0.110	0.263	†	†	†
	10A	R012710	0.988	0.950	0.000	†	†	†
R8	1	R015701	0.849	-1.190	0.273	†	†	†
	2A	R015702	0.605	0.079	0.000	1.394	-1.394	†
	3A	R015703	0.673	0.195	0.000	1.449	-1.449	†
	4A	R015704	0.575	-0.109	0.000	0.368	-0.368	†
	5A	R015705	0.792	0.332	0.000	0.811	-0.811	†
	6	R015706	1.184	1.134	0.199	†	†	†
	7A	R015707	0.525	0.485	0.000	1.270	-1.270	†
	8	R015708	0.549	-0.330	0.156	†	†	†
	9A	R015709	0.642	0.295	0.000	†	†	†
R10	1	R012501	0.697	3.217	0.330	†	†	†
	2	R012502	0.857	-1.864	0.278	†	†	†
	3A	R012503	1.038	-0.073	0.000	†	†	†
	4A	R012504	0.805	-0.270	0.000	†	†	†
	5	R012505	1.364	-0.689	0.274	†	†	†
	6A	R012506	0.807	-0.146	0.000	†	†	†
	7	R012507	1.304	-0.550	0.346	†	†	†
	8A	R012508	0.965	-0.392	0.000	†	†	†
	9	R012509	0.563	-0.612	0.289	†	†	†
	10	R012510	0.898	-0.587	0.262	†	†	†
	11A	R012511	0.912	-0.612	0.000	†	†	†
	12A	R012512	0.418	0.504	0.000	0.866	0.350	-1.216
† 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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