NAEP Analysis and Scaling - IRT Parameters for Items in the Writing Scale, Grade 8 Writing Combined National and State Main Assessment, by Item and Block: 2007

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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 8 Writing Combined National and State Main Assessment, by Item and Block: 2007

NAEP Technical DocumentationIRT parameters for items in the writing scale, grade 8 writing combined national and state main assessment, by item and block: 2007
Block	Item	NAEP ID	a_j	b_j	c_j	d_j1	d_j2	d_j3	d_j4	d_j5
† Not applicable; c parameters are not estimated for generalized partial credit models. NOTE: For item j, a_j represents the discriminatory power of the item, b_j represents a location parameter related to item difficulty, c_j represents the guessing parameter, and d_ji represents the category threshold parameter for category i. For item j, d_ji 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	W006002	0.89	-0.27	†	2.49	1.30	-0.07	-1.36	-2.36
W2	2	W006202	0.89	-0.17	†	2.31	1.06	-0.17	-1.19	-2.01
W3	3	W006302	0.99	-0.27	†	1.92	1.38	0.22	-1.32	-2.20
W4	4	W006402	0.90	-0.43	†	1.82	1.43	0.01	-1.18	-2.09
W5	5	W006502	0.88	-0.33	†	1.99	1.47	0.12	-1.11	-2.46
W6	6	W010902	1.08	-0.40	†	2.92	1.46	0.02	-1.53	-2.87
W7	7	W006802	1.01	-0.25	†	1.86	1.32	0.13	-1.32	-1.97
W8	8	W006902	0.93	-0.36	†	2.29	1.44	0.23	-1.51	-2.46
W9	9	W007002	1.24	-0.42	†	2.28	1.32	-0.02	-1.34	-2.24
W10	10	W007102	1.08	-0.16	†	2.05	1.46	0.39	-1.47	-2.42
W11	11	W011002	1.40	-0.45	†	2.18	1.35	-0.05	-1.36	-2.12
W12	12	W007402	0.83	-0.26	†	1.97	1.40	0.20	-1.14	-2.43
W13	13	W011102	1.03	-0.31	†	2.61	1.25	0.07	-1.39	-2.53
W14	14	W007802	0.97	-0.19	†	1.86	1.47	-0.07	-1.24	-2.02
W15	15	W007902	0.98	-0.05	†	2.18	1.49	0.18	-1.57	-2.28
W16	16	W008002	1.05	-0.08	†	2.36	1.32	0.11	-1.36	-2.43
W17	17	W008102	0.91	-0.09	†	1.86	1.31	0.14	-1.22	-2.10
W18	18	W011502	0.91	-0.22	†	2.17	1.39	0.05	-1.28	-2.33
W19	19	W011602	1.06	-0.18	†	2.54	1.37	0.06	-1.47	-2.50
W20	20	W011702	1.12	-0.27	†	2.27	1.36	-0.02	-1.43	-2.17

Last updated 10 December 2009 (JL)

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