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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 12 Reading National Main Assessment: 2002

NAEP Technical DocumentationIRT parameters for items in the reading for literary experience scale, by block and item, grade 12 reading national main assessment: 2002

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), 2002 Reading Assessment.
R3	1	R017101	1.30	-0.80	0.00	†	†	†
	2	R017102	0.69	0.29	†	0.09	-0.09	†
	3	R017103	0.57	-0.61	0.14	†	†	†
	4	R017104	0.97	0.00	†	0.14	-0.14	†
	5	R017105	0.79	0.81	†	0.65	-0.65	†
	6	R017106	0.55	0.46	0.17	†	†	†
	7	R017107	0.49	0.25	†	0.65	-0.65	†
	8	R017108	1.34	0.45	0.00	†	†	†
	9	R017109	0.69	-1.23	0.16	†	†	†
	10	R017110	0.99	-0.57	0.00	†	†	†
R4	1	R013501	0.92	-0.12	0.00	†	†	†
	2	R013502	1.45	-0.59	0.22	†	†	†
	3	R013503	0.52	0.28	0.00	†	†	†
	4	R013504	0.76	-0.38	0.17	†	†	†
	5	R013505	0.79	-0.70	0.00	†	†	†
	6	R013506	0.83	1.27	0.00	†	†	†
	7	R013507	0.89	0.10	0.13	†	†	†
	8	R013508	0.36	0.85	0.00	†	†	†
	9	R013509	0.73	0.56	0.00	†	†	†
R5	1	R016301	0.64	-0.84	0.00	†	†	†
	2	R016302	0.45	0.08	†	1.18	-1.18	†
	3	R016303	0.68	0.93	†	0.76	-0.76	†
	4	R016304	0.98	-0.18	0.28	†	†	†
	5	R016305	0.48	-0.38	†	1.11	-1.11	†
	6	R016306	0.64	0.68	†	0.19	-0.19	†
	7	R016307	0.70	1.06	†	1.22	-1.22	†
	8	R016308	0.38	2.58	†	1.02	0.88	-1.89

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