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NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Assessment Item Response Theory Parameters → Writing Assessment Item Response Theory Parameters → IRT Parameters for the Writing Scale, by Block and Item, Grade 8 Writing Combined National and State Main Assessment: 2002

NAEP Technical DocumentationIRT parameters for items in the writing scale, by block and item, grade 8 writing combined national and state main assessment: 2002

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 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 Writing Assessment.
W1	1	W006002	0.90	-0.30	†	2.52	1.11	-0.15	-1.38	-2.10
W2	1	W006102	0.95	-0.30	†	2.52	1.28	-0.15	-1.52	-2.13
W3	1	W006202	0.97	-0.08	†	2.47	1.07	-0.19	-1.27	-2.08
W4	1	W006302	1.08	-0.18	†	1.65	1.36	0.28	-1.09	-2.20
W5	1	W006402	0.74	-0.43	†	1.76	1.61	-0.02	-1.11	-2.24
W6	1	W006502	1.05	-0.34	†	2.16	1.33	0.25	-1.22	-2.52
W7	1	W006802	1.01	-0.28	†	2.24	1.29	0.09	-1.51	-2.11
W8	1	W006902	0.97	-0.24	†	2.39	1.40	0.24	-1.71	-2.31
W9	1	W007002	1.15	-0.33	†	2.30	1.32	0.10	-1.53	-2.19
W10	1	W007102	1.33	-0.15	†	1.99	1.36	0.33	-1.36	-2.33
W11	1	W007302	0.87	0.01	†	2.16	1.43	0.12	-1.74	-1.97
W12	1	W007402	0.91	-0.18	†	1.97	1.42	0.18	-1.29	-2.27
W13	1	W007702	1.27	0.07	†	1.96	1.35	0.15	-1.27	-2.19
W14	1	W007802	0.97	-0.04	†	1.81	1.42	0.07	-1.18	-2.12
W15	1	W007902	0.89	-0.01	†	2.26	1.58	0.10	-1.83	-2.11
W16	1	W008002	1.11	0.00	†	2.40	1.32	0.03	-1.37	-2.39
W17	1	W008102	0.92	-0.01	†	1.81	1.23	0.31	-1.24	-2.11
W18	1	W010902	1.04	-0.38	†	2.93	1.44	0.05	-1.60	-2.81
W19	1	W011102	1.05	-0.21	†	2.74	1.20	0.11	-1.49	-2.56
W20	1	W011002	1.01	-0.40	†	2.93	1.62	0.26	-1.73	-3.08

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