NAEP Analysis and Scaling - IRT Parameters, by Block and Item, Age 13 Reading Long-Term Trend Assessment: 2004

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NAEP Analysis and Scaling → Estimation of NAEP Score Scales → Item Response Theory Parameters → Reading Long-Term Trend Assessment Item Response Theory Parameters → IRT Parameters, by Block and Item, Age 13 Reading Long-Term Trend Assessment: 2004

NAEP Technical DocumentationIRT parameters, by block and item, age 13 reading long-term trend assessment: 2004
Block	Item	NAEP ID	a_j	b_j	c_j	d_j1	d_j2	d_j3	d_j4
† 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, 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 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, 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), 2004 Long-Term Trend Reading Assessment.
R21	1	N023701	0.76	-2.72	0.28	†	†	†	†
	2	N023702	0.92	-1.14	0.26	†	†	†	†
	3	N021201	1.47	-1.06	0.34	†	†	†	†
	4	N021202	1.03	0.44	0.27	†	†	†	†
	5	N021203	0.25	-0.30	†	3.74	-0.13	-1.26	-2.35
	6	N021301	0.95	-0.69	0.19	†	†	†	†
	7	N021302	1.69	0.16	0.16	†	†	†	†
	8	N021303	1.26	0.00	0.21	†	†	†	†
	9	N023101	1.09	0.00	0.32	†	†	†	†
	10	N023102	1.15	0.03	0.19	†	†	†	†
R22	1	N021401	0.61	-1.00	0.32	†	†	†	†
	2	N021402	0.53	-0.43	0.23	†	†	†	†
	3	N021403	1.50	0.03	0.30	†	†	†	†
	4	N021501	1.26	-0.89	0.36	†	†	†	†
	5	N021502	1.24	-0.44	0.30	†	†	†	†
	6	N021503	0.92	-1.37	0.23	†	†	†	†
	7	N023801	1.48	-0.92	0.36	†	†	†	†
	8	N023802	0.59	-0.33	†	0.08	1.59	-1.67	†
	9	N023901	1.25	0.34	0.24	†	†	†	†
R23	1	N024001	1.59	0.46	0.32	†	†	†	†
	2	N024002	1.45	-0.36	0.28	†	†	†	†
	3	N021801	0.85	-1.14	0.26	†	†	†	†
	4	N021802	0.73	0.57	0.33	†	†	†	†
	5	N021803	0.35	-0.35	†	2.68	-2.05	-0.64	†
	6	N022001	1.48	-1.02	0.29	†	†	†	†
	7	N022002	1.17	-1.21	0.26	†	†	†	†
	8	N022003	1.03	-0.75	0.30	†	†	†	†
	9	N022004	1.85	-0.97	0.25	†	†	†	†
	10	N023601	1.20	-1.52	0.26	†	†	†	†
	11	N023602	0.78	-2.22	0.26	†	†	†	†
R24	1	N024101	0.72	-0.37	0.28	†	†	†	†
	2	N024102	1.68	0.67	0.19	†	†	†	†
	3	N024103	0.84	0.40	0.24	†	†	†	†
	4	N024104	0.43	-0.17	0.24	†	†	†	†
	5	N022101	1.44	-1.20	0.33	†	†	†	†
	6	N022102	1.32	0.33	0.17	†	†	†	†
	7	N022103	0.54	0.71	†	1.87	0.29	-2.16	†
	8	N024201	1.01	-1.06	0.34	†	†	†	†
	9	N024202	0.92	-0.37	0.30	†	†	†	†
	10	N024203	1.14	-0.48	0.24	†	†	†	†
	11	N024204	0.58	-1.07	0.24	†	†	†	†
R25	1	N024301	1.18	0.83	0.22	†	†	†	†
	2	N024302	0.66	0.10	0.25	†	†	†	†
	3	N022401	2.14	-0.24	0.45	†	†	†	†
	4	N022402	1.83	-0.12	0.20	†	†	†	†
	5	N022403	2.57	0.06	0.33	†	†	†	†
	6	N022404	3.67	0.09	0.21	†	†	†	†
	7	N022405	0.75	-0.37	†	-0.09	1.68	-1.59	†
	8	N024401	0.79	-1.43	0.27	†	†	†	†
	9	N024402	0.96	-0.37	0.14	†	†	†	†
	10	N024403	1.15	-0.57	0.24	†	†	†	†
R26	1	N024501	1.11	-0.49	0.39	†	†	†	†
	2	N024502	0.71	-0.40	0.19	†	†	†	†
	3	N024503	1.31	0.47	0.29	†	†	†	†
	5	N024601	0.85	-0.67	0.27	†	†	†	†
	6	N024602	1.31	-1.31	0.26	†	†	†	†
	7	N024603	1.24	-0.93	0.29	†	†	†	†
	8	N024604	1.30	-1.27	0.31	†	†	†	†
	9	N024605	0.85	-0.81	0.28	†	†	†	†
	10	N024701	1.29	-0.65	0.28	†	†	†	†
	11	N024801	0.82	-1.87	0.27	†	†	†	†
	12	N024802	1.13	-1.00	0.28	†	†	†	†
	13	N024803	0.62	-0.30	0.21	†	†	†	†
	14	N022901	0.53	-2.77	0.27	†	†	†	†
R27	1	N024901	0.63	-0.06	0.22	†	†	†	†
	2	N024902	0.84	-1.56	0.37	†	†	†	†
	3	N024903	0.94	-1.63	0.28	†	†	†	†
	4	N025001	0.76	-0.49	0.32	†	†	†	†
	5	N025002	1.23	-1.06	0.25	†	†	†	†
	6	N025003	0.84	-0.49	0.18	†	†	†	†
	7	N025101	0.52	0.41	0.30	†	†	†	†
	8	N022301	1.89	-0.88	0.21	†	†	†	†
	9	N025201	1.08	-0.37	0.24	†	†	†	†
	10	N025202	0.90	0.06	0.35	†	†	†	†
	11	N025301	0.91	0.23	0.27	†	†	†	†
R28	1	N026101	1.09	-0.30	0.30	†	†	†	†
	2	N026102	0.80	-0.19	0.32	†	†	†	†
	3	N027301	1.10	-0.08	0.38	†	†	†	†
	4	N027302	0.39	0.85	†	3.44	1.25	1.33	-6.01
	5	N027401	1.13	-0.42	0.30	†	†	†	†
	6	N027402	1.53	0.14	0.20	†	†	†	†
	7	N027403	0.61	-0.04	0.27	†	†	†	†
	8	N027404	1.44	-0.45	0.24	†	†	†	†
	9	N027405	1.05	-1.21	0.35	†	†	†	†
	10	N025901	0.95	-1.30	0.24	†	†	†	†
R29	1	N027501	0.84	-0.62	0.23	†	†	†	†
	2	N027601	0.88	0.24	0.33	†	†	†	†
	3	N027602	0.78	1.98	†	2.02	0.15	-2.17	†
	4	N026701	1.02	-0.92	0.19	†	†	†	†
	5	N026601	0.67	-3.38	0.25	†	†	†	†
	6	N026501	1.21	-0.98	0.27	†	†	†	†
	7	N026502	0.62	-1.46	0.21	†	†	†	†
	8	N026503	0.75	-1.35	0.28	†	†	†	†
	9	N026801	1.02	-0.34	0.26	†	†	†	†
R30	1	N027701	0.91	-1.86	0.24	†	†	†	†
	2	N027702	0.94	-0.57	0.23	†	†	†	†
	3	N027801	0.67	-1.44	0.21	†	†	†	†
	4	N027802	1.47	-0.88	0.21	†	†	†	†
	5	N027803	1.05	-0.23	0.25	†	†	†	†
	6	N027804	0.78	-0.08	0.18	†	†	†	†
	8	N027901	0.48	-0.68	0.30	†	†	†	†
	9	N027902	1.08	-0.98	0.29	†	†	†	†
	10	N027903	0.92	-0.27	0.30	†	†	†	†
	11	N027904	0.89	-0.40	0.21	†	†	†	†

Last updated 27 July 2009 (JL)

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