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 12 Reading Vocabulary National Assessment: 2009

NAEP Technical DocumentationIRT parameters for the meaning vocabulary scale, grade 12 reading vocabulary national assessment: 2009

Block1	Item	NAEP ID	aj	bj	cj	dj1	dj2	dj3	dj4	dj5
1 The table includes Meaning 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), 2009 Reading Vocabulary Assessment.
R1	2	R059602	0.81	-0.02	0.21	†	†	†	†	†
	8	R059608	0.98	-0.22	0.20	†	†	†	†	†
R2	2	R059802	0.37	2.61	0.19	†	†	†	†	†
	4	R059804	0.99	-0.67	0.25	†	†	†	†	†
R3	2	R060102	0.92	-0.25	0.22	†	†	†	†	†
	9	R060109	1.25	0.46	0.18	†	†	†	†	†
R4	2	R060302	1.30	-0.30	0.27	†	†	†	†	†
	8	R060308	1.03	0.55	0.23	†	†	†	†	†
R5	1	R061601	1.38	-0.37	0.22	†	†	†	†	†
	3	R061603	1.32	-0.67	0.23	†	†	†	†	†
R6	2	R061902	0.88	0.45	0.28	†	†	†	†	†
	8	R061907	1.73	1.03	0.16	†	†	†	†	†
R7	4	R062204	0.69	-0.57	0.23	†	†	†	†	†
	8	R062208	0.62	0.08	0.20	†	†	†	†	†
R8	5	R062305	1.52	0.22	0.29	†	†	†	†	†
	9	R062310	1.17	0.49	0.20	†	†	†	†	†
R9	3	R062511	1.99	0.46	0.25	†	†	†	†	†
	9	R062510	0.98	0.56	0.27	†	†	†	†	†
R10	3	R062703	0.63	-0.10	0.25	†	†	†	†	†
	9	R062709	1.20	0.96	0.34	†	†	†	†	†
R11	4	R062904	0.53	-0.07	0.20	†	†	†	†	†
	5	R062905	1.01	0.70	0.26	†	†	†	†	†
R12	2	R063103	2.31	0.63	0.22	†	†	†	†	†
	6	R063106	1.15	0.10	0.37	†	†	†	†	†
R13	6	R063206	1.42	-0.14	0.31	†	†	†	†	†
	9	R063209	1.78	-0.08	0.30	†	†	†	†	†
R14	1	R0V0401	2.80	0.76	0.29	†	†	†	†	†
	2	R0V0402	1.11	-0.77	0.17	†	†	†	†	†
	3	R0V0403	0.74	0.12	0.18	†	†	†	†	†
	4	R0V0404	0.65	0.76	0.26	†	†	†	†	†
	5	R0V0405	0.99	0.64	0.23	†	†	†	†	†
	6	R0V0406	1.15	0.82	0.31	†	†	†	†	†
R15	1	R0V0506	1.22	-0.07	0.14	†	†	†	†	†
	2	R0V0507	0.75	1.20	0.24	†	†	†	†	†
	3	R0V0508	0.94	-0.61	0.14	†	†	†	†	†
	4	R0V0509	1.04	0.46	0.31	†	†	†	†	†
	5	R0V0510	1.93	0.51	0.21	†	†	†	†	†
R16	1	R0V0801	0.98	-0.35	0.21	†	†	†	†	†
	2	R0V0802	1.03	1.28	0.27	†	†	†	†	†
	3	R0V0803	1.36	0.91	0.22	†	†	†	†	†
	4	R0V0804	1.45	0.17	0.24	†	†	†	†	†
	5	R0V0805	1.98	1.51	0.19	†	†	†	†	†
R17	1	R0V1001	0.77	-0.18	0.20	†	†	†	†	†
	2	R0V1002	2.20	0.94	0.15	†	†	†	†	†
	3	R0V1003	1.29	0.43	0.12	†	†	†	†	†
	4	R0V1004	0.76	-0.25	0.21	†	†	†	†	†
	5	R0V1005	1.57	1.07	0.26	†	†	†	†	†

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