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NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Assessment Item Response Theory Parameters → Reading Assessment Item Response Theory Parameters → IRT Parameters for the Reading for Literary Experience Scale, by Block and Item, Grade 4 Reading Combined National and State Main Assessment: 2003

NAEP Technical DocumentationIRT parameters for items in the reading for literary experience scale, by block and item, grade 4 reading combined national and state main assessment: 2003

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2	dj3
† Not applicable; c parameters are not estimated for generalized partial credit models. 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. For item j, dji may not sum to zero because of rounding. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2003 Reading Assessment.
R3	1	R017001	0.67	-0.90	0.00	†	†	†
	2	R017002	1.47	-0.54	0.21	†	†	†
	3	R017003	0.54	-0.02	†	0.36	-0.36	†
	4	R017004	0.88	0.91	0.00	†	†	†
	5	R017005	0.86	0.68	0.23	†	†	†
	6	R017006	0.93	0.94	0.00	†	†	†
	7	R017007	0.50	0.48	†	0.33	0.16	-0.49
	8	R017008	1.05	0.39	0.11	†	†	†
	9	R017009	0.62	-2.13	0.00	†	†	†
R4	1	R012101	1.72	-0.99	0.30	†	†	†
	2	R012102	0.65	0.00	0.00	†	†	†
	3	R012103	1.29	-0.66	0.15	†	†	†
	4	R012104	0.75	-0.50	0.00	†	†	†
	5	R012105	0.84	0.00	0.18	†	†	†
	6	R012106	0.94	0.18	0.00	†	†	†
	7	R012107	1.40	0.39	0.29	†	†	†
	8	R012113	0.50	-0.59	†	0.38	-0.38	†
	9	R012109	0.45	-1.37	0.00	†	†	†
	10	R012110	1.02	-0.85	0.39	†	†	†
	11	R012111	0.93	1.66	†	1.40	-1.40	†
	12	R012112	0.69	-0.65	0.00	†	†	†
R5	1	R012601	0.79	0.71	0.00	†	†	†
	2	R012602	1.51	1.09	0.19	†	†	†
	3	R012603	1.49	-0.03	0.24	†	†	†
	4	R012604	1.07	0.92	0.00	†	†	†
	5	R012605	0.91	0.90	0.29	†	†	†
	6	R012606	1.69	0.35	0.34	†	†	†
	7	R012607	0.99	1.16	†	1.00	-0.18	-0.82
	8	R012608	0.55	-0.78	0.36	†	†	†
	9	R012609	1.17	0.71	0.30	†	†	†
	10	R012610	1.74	0.38	0.37	†	†	†
	11	R012612	0.55	0.99	0.00	†	†	†
R9	1	R015801	1.01	-1.53	0.21	†	†	†
	2	R015810	0.35	-1.66	†	-0.59	0.59	†
	3	R015803	0.66	-1.53	0.00	†	†	†
	4	R015804	0.57	0.58	†	2.20	-0.30	-1.89
	5	R015805	1.17	0.19	0.32	†	†	†
	6	R015806	0.68	0.28	†	0.97	-0.97	†
	7	R015807	0.59	-0.09	†	1.05	-1.05	†
	8	R015808	0.63	-1.56	0.24	†	†	†
	9	R015809	0.79	1.37	0.00	†	†	†
R11	1	R021601	0.61	-0.77	0.35	†	†	†
	2	R020401	0.79	-1.97	0.00	†	†	†
	3	R020601	1.26	-1.51	0.21	†	†	†
	4	R021101	0.46	-1.66	0.10	†	†	†
	5	R020701	0.88	-0.85	0.00	†	†	†
	6	R020501	1.15	0.26	0.16	†	†	†
	7	R022101	1.49	-1.07	0.19	†	†	†
	8	R021701	0.45	0.42	†	1.26	-1.26	†
	9	R022201	1.16	-1.49	0.35	†	†	†
	10	R021201	0.37	-1.17	†	-0.08	0.08	†

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