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NAEP Analysis and Scaling → Estimation of NAEP Score Scales → Item Response Theory Parameters → Mathematics Long-Term Trend Assessment Item Response Theory Parameters → IRT Parameters, by Block and Item, Age 9 Mathematics Long-Term Trend Assessment: 2004

NAEP Technical DocumentationIRT parameters, by block and item, age 9 mathematics long-term trend assessment: 2004

Block	Item	NAEP ID	aj	bj	cj
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. The c parameter value is exactly zero for items scaled with the two-parameter logistic model. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2004 Mathematics Long-Term Trend Assessment.
M21	1	N291601	0.86	-0.57	0.11
	2	N291701	0.83	-1.03	0.24
	3	N291801	1.26	2.33	0.14
	4	N291901	0.40	1.62	0.19
	5	N292001	0.70	-0.63	0.11
	6	N292101	1.08	-0.80	0.00
	7	N292201	0.83	1.14	0.18
	8	N292301	0.84	0.39	0.32
	9	N292401	0.59	-0.41	0.00
	10	N292501	1.33	0.92	0.42
	11	N292601	1.39	0.10	0.14
	12	N292701	1.12	-0.81	0.29
	13	N292801	0.89	-1.15	0.27
	14	N292901	1.31	-0.79	0.12
	15	N293001	0.90	-0.42	0.00
	16	N293101	1.09	-1.94	0.12
	17	N293201	1.22	0.76	0.18
	18	N293301	0.87	-0.92	0.00
	19	N293401	0.91	-1.11	0.19
	20	N293501	0.68	-0.88	0.00
	21	N293601	1.75	0.89	0.21
	22	N293701	1.65	0.22	0.09
	23	N293801	1.51	0.67	0.21
M22	1	N293901	1.12	-1.15	0.13
	2	N294001	0.87	-2.35	0.16
	3	N294101	0.86	-1.35	0.27
	4	N294201	0.80	-2.99	0.00
	5	N294301	0.90	-0.96	0.00
	6	N294401	0.84	-0.81	0.19
	7	N294501	0.93	-0.59	0.10
	8	N294601	1.30	0.05	0.20
	9	N294701	0.48	-2.24	0.17
	10	N294801	1.61	1.59	0.14
	11	N294901	0.75	0.02	0.21
	12	N295001	0.68	-1.93	0.17
	13	N295101	1.14	-0.31	0.16
	14	N295201	1.19	-0.11	0.19
	15	N295301	1.09	-1.13	0.00
	16	N295401	0.99	-0.49	0.00
	17	N295501	1.26	0.33	0.20
	18	N295601	0.96	-1.24	0.15
	19	N295701	1.20	0.77	0.00
	20	N295801	1.04	0.32	0.31
	21	N295901	1.36	1.38	0.08
	22	N296001	1.09	0.66	0.29
	23	N296101	1.10	0.99	0.24
M23	1	N310401	0.68	-3.25	0.00
	2	N310501	0.88	-2.17	0.15
	3	N310601	1.02	-0.82	0.17
	4	N310701	0.55	-3.82	0.00
	5	N310702	0.62	-2.18	0.00
	6	N310703	0.66	-0.27	0.00
	7	N310801	0.59	-1.50	0.09
	8	N310802	1.05	0.31	0.11
	9	N310803	0.78	-0.92	0.05
	10	N310901	0.83	-0.57	0.28
	11	N311001	0.91	-0.95	0.21
	12	N311101	1.05	-0.94	0.00
	13	N311201	0.77	-1.12	0.00
	14	N311301	0.59	-0.91	0.00
	15	N311401	1.06	-0.68	0.17
	16	N311501	0.93	-0.71	0.00
	17	N311502	1.05	1.15	0.00
	18	N311601	1.28	-0.14	0.20
	19	N311701	0.49	-0.37	0.34
	21	N311801	0.31	2.72	0.25
	22	N311901	0.77	1.47	0.27
	23	N312001	1.01	0.84	0.20
	24	N312101	1.42	0.45	0.14
	25	N312201	0.62	0.58	0.20
M24	1	N312401	1.13	-1.93	0.17
	2	N312501	1.53	-0.66	0.25
	3	N312601	0.66	-1.39	0.22
	4	N312701	1.02	-1.83	0.21
	5	N312702	0.81	-1.75	0.22
	6	N312801	0.80	-1.22	0.38
	7	N312901	1.00	-1.15	0.00
	8	N313001	0.64	-1.38	0.00
	9	N313101	0.89	-0.98	0.00
	10	N313102	0.93	-0.01	0.00
	11	N313103	0.81	-0.17	0.00
	12	N313201	0.44	-0.83	0.20
	13	N313301	1.10	-1.98	0.16
	14	N313302	0.59	-1.56	0.12
	15	N313303	1.02	-0.23	0.12
	16	N313401	0.80	-0.77	0.11
	17	N313501	0.69	-1.26	0.11
	18	N313502	1.14	0.31	0.16
	19	N313503	1.28	-0.55	0.12
	20	N313601	1.68	0.69	0.45
	21	N313701	0.97	-0.84	0.00
	22	N313702	1.29	0.52	0.00
	23	N313801	0.91	-0.52	0.00
	24	N313901	0.84	-0.59	0.00
	25	N314001	1.27	1.03	0.28
	26	N314101	0.94	1.55	0.09
MX51	1	N287401	1.03	0.03	0.17
	2	N287501	1.42	-0.63	0.16
	3	N287601	1.16	0.86	0.00
	4	N287701	0.73	-1.57	0.25
	5	N287801	0.75	-2.07	0.13
	6	N287901	0.92	-1.45	0.23
	7	N288001	1.19	-0.08	0.17
	8	N288101	0.62	-0.37	0.00
	9	N288201	1.14	1.24	0.23
	10	N288301	0.82	-1.67	0.21
	11	N288401	1.08	-0.52	0.33
	12	N288501	1.11	-0.50	0.00
	13	N288601	1.25	-0.06	0.13
	14	N288701	1.11	-1.04	0.25
	15	N288801	1.66	0.77	0.27
	16	N288901	0.99	-0.25	0.23
	17	N289001	1.21	0.64	0.19
	18	N289101	1.43	0.40	0.11
	19	N289201	1.26	-0.33	0.00
	20	N289301	1.32	1.82	0.25
	21	N289401	0.60	-0.22	0.31
MX52	1	N289501	0.44	-1.56	0.22
	2	N289601	1.01	-0.81	0.41
	3	N289701	1.03	-0.67	0.00
	4	N289801	1.08	-1.06	0.26
	5	N289901	0.58	-2.47	0.00
	6	N290001	0.74	-0.95	0.25
	7	N290101	0.84	0.07	0.00
	8	N290201	1.27	0.03	0.15
	9	N290301	2.31	1.70	0.15
	10	N290401	0.60	-0.28	0.16
	11	N290501	0.53	-1.51	0.25
	12	N290601	1.23	-0.13	0.45
	13	N290701	0.30	-3.91	0.00
	14	N290801	1.31	0.17	0.12
	17	N291101	0.80	-0.20	0.28
	18	N291201	1.53	-0.07	0.17
	19	N291301	0.99	1.63	0.35
	20	N291401	0.73	-0.12	0.23
	21	N291501	0.48	1.99	0.00
	22	N2909CL	0.53	3.77	0.00

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