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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 13 Mathematics Long-Term Trend Bridge Study: 2004

NAEP Technical DocumentationIRT parameters, by block and item, age 13 mathematics long-term trend bridge study: 2004

Block	Item	NAEP ID	aj	bj	cj
# Rounds to zero. 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.
M1	1	N281901	1.23	-2.17	0.19
	2	N254601	0.89	-2.12	0.40
	3	N276801	0.48	-4.80	0.00
	4	N276802	0.43	-4.41	0.00
	5	N276803	0.40	-2.06	0.00
	6	N277601	0.76	-2.36	0.00
	7	N277602	0.69	-1.36	0.00
	8	N277603	0.63	-1.63	0.00
	9	N267201	0.94	-0.85	0.43
	10	N286201	0.85	-1.13	0.21
	11	N250901	0.37	-3.14	0.18
	12	N250902	0.98	-0.82	0.18
	13	N250903	0.82	-1.92	0.16
	14	N262401	1.08	-0.53	0.26
	15	N274801	0.98	-0.07	0.37
	16	N265202	0.74	-0.33	0.36
	17	N266801	0.59	-1.20	0.29
	18	N252901	1.05	-0.10	0.09
	19	N262501	0.46	-1.53	0.26
	21	N257601	1.29	-0.64	0.00
	22	N265201	0.70	-2.54	0.35
	23	N273901	1.38	-0.16	0.23
	24	N258801	1.37	0.53	0.41
	25	N263101	0.69	-0.34	0.00
	26	N265901	0.90	1.02	0.23
	27	N252101	0.91	0.25	0.43
	28	N275001	0.96	0.41	0.00
	29	N260101	1.22	-0.33	0.25
	30	N269001	1.00	-0.34	0.13
	31	N286301	1.20	0.25	0.20
	32	N254602	0.86	1.21	0.18
	33	N261001	0.82	0.45	0.25
	34	N286501	0.89	0.43	0.15
	35	N278904	0.78	1.17	0.24
	36	N255701	1.00	0.58	0.16
	37	N283101	1.67	0.93	0.17
M2	1	N277401	0.49	-3.92	0.18
	2	N277901	0.67	-3.06	0.00
	3	N277902	0.63	-3.20	0.00
	4	N277903	0.64	-2.42	0.00
	5	N263401	0.74	-2.85	0.29
	6	N263402	0.73	-2.10	0.30
	7	N250701	0.37	-4.56	0.14
	8	N250702	0.90	-1.21	0.10
	9	N250703	0.61	-2.60	0.11
	10	N256101	0.81	-1.87	0.00
	11	N262201	0.62	-1.41	0.36
	12	N250201	0.68	-1.50	0.28
	13	N270301	0.56	-1.58	0.24
	14	N270302	1.13	1.49	0.08
	15	N253701	0.74	0.44	0.52
	16	N286601	0.94	-0.21	0.00
	17	N286602	0.97	-0.32	0.00
	18	N286603	1.27	0.41	0.00
	19	N269101	0.92	-0.79	0.17
	20	N285701	0.95	-0.06	0.33
	21	N282201	1.18	0.39	0.28
	22	N278902	1.04	0.81	0.30
	23	N263501	0.90	-0.02	0.07
	24	N258802	1.43	0.19	0.21
	25	N278901	1.24	-0.04	0.25
	26	N264701	1.15	0.29	0.23
	27	N261501	0.76	-0.55	0.30
	28	N261801	0.67	-0.22	0.19
	29	N261301	0.46	0.87	0.10
	31	N261201	0.76	2.52	0.28
	32	N281401	0.75	2.21	0.17
	33	N252001	1.09	0.62	0.27
	34	N258803	0.92	0.82	0.25
	35	N278903	1.78	0.60	0.22
	36	N286502	1.06	0.69	0.11
	37	N269201	0.78	1.02	0.00
M21	1	N299801	1.31	0.81	0.35
	2	N299901	0.61	-1.94	0.14
	3	N300001	1.14	-1.64	0.21
	4	N300101	0.44	-2.62	0.19
	5	N300201	1.21	-0.45	0.00
	6	N300301	1.80	#	0.27
	7	N300401	1.04	0.38	0.00
	8	N292301	0.82	-0.72	0.31
	9	N292401	0.26	-3.16	0.00
	10	N292501	0.79	-0.34	0.21
	11	N292601	0.68	-1.15	0.21
	12	N300501	1.00	0.42	0.00
	13	N300601	0.47	-1.44	0.33
	14	N300701	1.18	-0.50	0.16
	15	N300801	1.13	-0.28	0.20
	16	N300901	1.49	0.04	0.21
	17	N301001	0.85	1.16	0.21
	18	N301101	0.59	-0.83	0.26
	19	N301201	0.88	-0.83	0.23
	20	N301301	1.05	0.72	0.21
	21	N301401	0.75	-0.54	0.12
	22	N301501	0.90	-1.78	0.00
	23	N301601	0.84	0.39	0.33
M22	1	N301701	0.86	-1.31	0.21
	2	N301801	0.39	-4.38	0.00
	3	N301901	0.64	-0.84	0.11
	4	N302001	1.16	0.49	0.26
	5	N302101	0.82	-0.59	0.27
	6	N302201	0.80	-0.62	0.26
	7	N302301	0.53	-3.12	0.25
	8	N294601	0.67	-2.33	0.13
	9	N294701	0.49	-2.66	0.16
	10	N294801	0.71	0.46	0.15
	11	N294901	0.88	-0.67	0.24
	12	N302401	1.15	-0.43	0.00
	13	N302501	0.73	0.57	0.10
	14	N302601	1.11	0.43	0.00
	15	N302701	1.23	-0.41	0.25
	16	N302801	0.88	0.14	0.38
	17	N302901	0.76	-1.79	0.00
	19	N303101	0.83	-0.55	0.15
	20	N303201	0.95	0.32	0.00
	21	N303301	0.91	-0.91	0.13
	22	N303401	0.97	-0.15	0.18
	23	N303501	0.30	-1.04	0.31

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