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NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Assessment IRT Parameters → Writing Assessment IRT Parameters → IRT Parameters for Items in the Writing Scale, Grade 12 Writing National Main Assessment, by Item and Block: 2007

NAEP Technical DocumentationIRT parameters for items in the writing scale, grade 12 writing national main assessment, by item and block: 2007

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2	dj3	dj4	dj5
† 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 represents the category threshold parameter for category i. 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), 2007 Writing Assessment.
W1	1	W008402	0.91	-0.41	†	1.67	1.70	0.63	-1.27	-2.73
W2	2	W011202	0.82	-0.66	†	1.95	1.56	0.34	-1.09	-2.75
W3	3	W008602	0.76	-0.87	†	2.26	1.22	0.33	-1.32	-2.49
W4	4	W008702	0.93	-0.51	†	2.61	1.28	0.16	-1.51	-2.55
W5	5	W008902	0.91	-0.78	†	2.36	1.36	0.07	-1.11	-2.68
W6	6	W011302	1.07	-0.19	†	1.99	1.22	0.27	-1.12	-2.37
W7	7	W009102	0.95	-0.49	†	2.04	1.49	0.54	-1.42	-2.64
W8	8	W009202	1.24	-0.21	†	1.81	1.21	0.17	-1.02	-2.17
W9	9	W009302	0.84	-0.56	†	1.56	1.37	0.35	-0.89	-2.38
W10	10	W009502	0.92	-0.33	†	1.68	1.19	0.25	-0.95	-2.17
W11	11	W009702	0.91	-0.02	†	1.91	1.16	0.15	-1.11	-2.11
W12	12	W009802	0.76	-0.14	†	1.90	1.23	0.10	-1.13	-2.10
W13	13	W009902	0.83	-0.40	†	1.80	1.32	0.34	-1.18	-2.29
W14	14	W011402	0.86	-0.37	†	2.03	1.40	0.30	-1.20	-2.54
W15	15	W010202	0.97	-0.18	†	1.96	1.24	0.30	-1.18	-2.33
W16	16	W010302	0.88	-0.16	†	1.73	1.35	0.21	-1.01	-2.28
W17	17	W010402	0.82	-0.41	†	1.75	1.47	0.00	-1.11	-2.11
W18	18	W011802	0.85	-0.61	†	2.06	1.23	0.24	-1.12	-2.42
W19	19	W011902	1.08	-0.05	†	2.43	1.20	0.01	-1.36	-2.29
W20	20	W012002	0.98	0.09	†	2.15	1.22	0.16	-1.18	-2.35

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