NAEP Analysis and Scaling - IRT Parameters for the Reading to Gain Information Scale, by Block and Item, Grade 4 Reading National Main Assessment (Accommodations Permitted [R3]): 2000

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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 Permitted [R3]): 2000

NAEP Technical DocumentationIRT parameters for the reading to gain information scale, by block and item, grade 4 reading national main assessment (accommodations permitted [R3]): 2000
Block	Item	NAEP ID	a_j	b_j	c_j	d_j1	d_j2	d_j3
R6	1A	R017301	0.796	-1.192	0.000	†	†	†
	2	R017302	1.305	-0.358	0.240	†	†	†
	3A	R017303	0.755	-0.075	0.000	0.595	-0.595	†
	4	R017304	1.351	0.143	0.281	†	†	†
	5A	R017305	0.961	-0.344	0.000	†	†	†
	6	R017306	1.073	-0.240	0.262	†	†	†
	7A	R017307	0.713	1.010	0.000	1.050	-0.161	-0.889
	8	R017308	1.315	-0.039	0.279	†	†	†
	9A	R017309	0.546	0.121	0.000	0.528	-0.528	†
R7	1	R012701	1.185	-0.056	0.337	†	†	†
	2A	R012702	0.580	-1.163	0.000	†	†	†
	3A	R012703	0.997	0.643	0.000	†	†	†
	4	R012704	1.284	0.890	0.159	†	†	†
	5A	R012705	1.409	1.183	0.000	†	†	†
	6A	R012706	0.594	1.204	0.000	†	†	†
	7	R012707	2.060	0.359	0.244	†	†	†
	8A	R012708	0.616	1.856	0.000	1.484	0.385	-1.869
	9	R012709	0.632	-0.008	0.299	†	†	†
	10A	R012710	0.967	0.988	0.000	†	†	†
R8	1	R015701	0.939	-1.004	0.320	†	†	†
	2A	R015702	0.612	0.068	0.000	1.419	-1.419	†
	3A	R015703	0.694	0.203	0.000	1.436	-1.436	†
	4A	R015704	0.584	-0.093	0.000	0.368	-0.368	†
	5A	R015705	0.755	0.342	0.000	0.825	-0.825	†
	6	R015706	1.194	1.144	0.193	†	†	†
	7A	R015707	0.544	0.503	0.000	1.215	-1.215	†
	8	R015708	0.553	-0.307	0.154	†	†	†
	9A	R015709	0.629	0.320	0.000	†	†	†
R10	1	R012501	0.654	3.238	0.319	†	†	†
	2	R012502	0.854	-1.948	0.241	†	†	†
	3A	R012503	1.090	-0.044	0.000	†	†	†
	4A	R012504	0.810	-0.266	0.000	†	†	†
	5	R012505	1.312	-0.734	0.266	†	†	†
	6A	R012506	0.802	-0.154	0.000	†	†	†
	7	R012507	1.263	-0.596	0.317	†	†	†
	8A	R012508	0.935	-0.403	0.000	†	†	†
	9	R012509	0.561	-0.641	0.271	†	†	†
	10	R012510	0.873	-0.588	0.271	†	†	†
	11A	R012511	0.874	-0.625	0.000	†	†	†
	12A	R012512	0.423	0.504	0.000	0.891	0.338	-1.230
† Not applicable; the number of item parameters estimated depends upon the IRT model used for scaling. NOTE: For item j, a_j represents the discriminatory power of the item, b_j represents a location parameter related to item difficulty, c_j represents the guessing parameter, and d_ji 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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