NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Assessment IRT Parameters → IRT Parameters for the Reading Assessments → IRT Parameters for the Reading Vocabulary Scale, Grade 4 Reading Vocabulary Combined National and State Assessments, By Item and Block: 2011

NAEP Technical DocumentationIRT parameters for the reading vocabulary scale, grade 4 reading vocabulary combined national and state assessments, by Item and block: 2011

Block1	Item	NAEP ID	aj	bj	cj	dj1	dj2	dj3	dj4	dj5
1 The table includes reading vocabulary items from both the half-blocks as well as the reading vocabulary items embedded within the 25-minute reading comprehension blocks. † Not applicable; c parameters are not estimated for generalized partial credit models, and d parameters are not estimated for two-parameter or three-parameter logistic 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 represents 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), 2011 Reading Vocabulary Assessment.
R1	8	R057708	0.84	-0.14	0.10	†	†	†	†	†
	9	R057709	0.67	-1.03	0.22	†	†	†	†	†
R2	2	R057802	0.92	-0.31	0.27	†	†	†	†	†
	8	R057808	0.89	0.65	0.23	†	†	†	†	†
R3	9	R068709	0.67	1.36	0.28	†	†	†	†	†
	10	R068710	0.78	0.74	0.20	†	†	†	†	†
R4	4	R058203	0.42	1.41	0.26	†	†	†	†	†
	6	R058205	0.79	-0.71	0.21	†	†	†	†	†
R5	2	R058502	0.86	0.39	0.20	†	†	†	†	†
	3	R058503	0.86	0.41	0.19	†	†	†	†	†
R6	5	R058605	0.92	0.42	0.15	†	†	†	†	†
	10	R058610	1.24	-0.12	0.22	†	†	†	†	†
R7	2	R058802	1.29	-0.42	0.29	†	†	†	†	†
	8	R058808	1.04	0.73	0.22	†	†	†	†	†
R8	2	R059102	1.01	-0.85	0.08	†	†	†	†	†
	4	R059104	1.64	-0.84	0.13	†	†	†	†	†
R9	6	R058306	1.59	0.90	0.31	†	†	†	†	†
	8	R058308	1.75	0.25	0.19	†	†	†	†	†
R10	7	R059505	1.01	-0.27	0.14	†	†	†	†	†
	9	R059508	1.08	2.26	0.25	†	†	†	†	†
R14	1	R0V1201	1.16	-0.75	0.16	†	†	†	†	†
	2	R0V1202	0.93	0.10	0.07	†	†	†	†	†
	3	R0V1203	1.12	-0.49	0.23	†	†	†	†	†
	4	R0V1204	0.93	0.01	0.13	†	†	†	†	†
	5	R0V1205	0.87	-0.36	0.13	†	†	†	†	†
R15	1	R0V0101	1.28	0.37	0.20	†	†	†	†	†
	2	R0V0102	1.25	1.19	0.33	†	†	†	†	†
	3	R0V0103	0.54	0.40	0.06	†	†	†	†	†
	4	R0V0104	1.44	-0.62	0.11	†	†	†	†	†
	5	R0V0105	1.11	-0.37	0.18	†	†	†	†	†
R16	1	R0V0206	1.22	-0.76	0.13	†	†	†	†	†
	2	R0V0207	1.55	-0.55	0.13	†	†	†	†	†
	3	R0V0208	1.85	-0.58	0.21	†	†	†	†	†
	4	R0V0209	1.08	-0.06	0.19	†	†	†	†	†
	5	R0V0210	1.45	-0.34	0.18	†	†	†	†	†
R17	1	R0V0306	1.99	0.54	0.29	†	†	†	†	†
	2	R0V0307	1.81	0.01	0.15	†	†	†	†	†
	3	R0V0308	0.28	0.42	0.11	†	†	†	†	†
	4	R0V0309	1.50	-0.05	0.19	†	†	†	†	†
	5	R0V0310	1.08	0.89	0.22	†	†	†	†	†

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