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

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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 Assessment: 2004

NAEP Technical DocumentationIRT parameters, by block and item, age 13 mathematics long-term trend assessment: 2004
Block	Item	NAEP ID	a_j	b_j	c_j
# Rounds to zero. 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. 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	N299801	1.32	0.54	0.36
	2	N299901	0.54	-2.25	0.12
	3	N300001	1.13	-1.68	0.18
	4	N300101	0.48	-2.40	0.18
	5	N300201	1.23	-0.48	0.00
	6	N300301	1.42	-0.19	0.21
	7	N300401	0.91	0.25	0.00
	8	N292301	0.62	-1.21	0.23
	9	N292401	0.27	-3.08	0.00
	10	N292501	0.91	-0.45	0.24
	11	N292601	0.75	-1.19	0.19
	12	N300501	0.95	0.44	0.00
	13	N300601	0.47	-1.54	0.28
	14	N300701	1.23	-0.35	0.14
	15	N300801	1.16	-0.30	0.21
	16	N300901	1.66	0.00	0.19
	17	N301001	0.75	1.08	0.19
	18	N301101	0.63	-0.84	0.25
	19	N301201	0.89	-0.91	0.19
	20	N301301	1.02	0.63	0.21
	21	N301401	0.69	-0.52	0.10
	22	N301501	0.80	-1.99	0.00
	23	N301601	0.98	0.49	0.32
M22	1	N301701	0.98	-1.27	0.27
	2	N301801	0.40	-4.48	0.00
	3	N301901	0.55	-1.11	0.10
	4	N302001	1.15	0.10	0.16
	5	N302101	0.79	-0.86	0.23
	6	N302201	0.82	-0.88	0.23
	7	N302301	0.49	-3.68	0.24
	8	N294601	0.68	-2.34	0.13
	9	N294701	0.49	-3.15	0.15
	10	N294801	0.72	0.14	0.13
	11	N294901	0.77	-0.89	0.31
	12	N302401	1.23	-0.49	0.00
	13	N302501	0.83	0.48	0.07
	14	N302601	0.88	0.40	0.00
	15	N302701	1.09	-0.63	0.15
	16	N302801	0.94	-0.10	0.32
	17	N302901	0.84	-1.63	0.00
	19	N303101	0.78	-0.22	0.25
	20	N303201	1.01	0.31	0.00
	21	N303301	1.00	-0.88	0.15
	22	N303401	0.97	-0.28	0.16
	23	N303501	0.31	-1.29	0.30
M23	1	N314201	1.16	-2.10	0.22
	2	N314301	0.98	-1.73	0.31
	3	N310701	0.37	-5.75	0.00
	4	N310702	0.30	-5.82	0.00
	5	N310703	0.25	-3.47	0.00
	6	N313101	0.76	-2.33	0.00
	7	N313102	0.65	-1.29	0.00
	8	N313103	0.60	-1.70	0.00
	9	N314401	1.02	-0.84	0.45
	10	N314501	1.00	-1.02	0.15
	11	N313501	0.43	-3.09	0.13
	12	N313502	0.97	-1.06	0.12
	13	N313503	0.85	-2.26	0.15
	14	N314601	0.77	-1.11	0.24
	15	N314701	0.97	-0.14	0.39
	16	N314801	0.89	-0.27	0.35
	17	N314901	0.66	-0.93	0.27
	18	N315001	1.24	0.01	0.10
	19	N311701	0.41	-0.89	0.35
	20	N311702	1.12	2.09	0.21
	21	N315101	1.40	-0.60	0.00
	22	N315201	0.91	-2.29	0.26
	23	N315301	1.44	-0.17	0.16
	24	N315401	1.54	0.55	0.34
	25	N315501	0.72	-0.67	0.00
	26	N315601	1.04	1.00	0.18
	27	N312201	1.05	0.03	0.41
	28	N315701	0.90	0.36	0.00
	29	N315801	1.08	-0.38	0.13
	30	N314101	0.94	-0.38	0.10
	31	N315901	1.12	0.15	0.18
	32	N316001	1.04	1.23	0.18
	33	N316101	0.82	-0.21	0.24
	34	N316201	0.93	0.20	0.09
	35	N316301	0.81	0.78	0.13
	36	N316401	1.47	0.57	0.15
	37	N316501	1.40	0.84	0.15
M24	1	N310501	0.70	-3.38	0.14
	2	N316601	0.54	-3.48	0.00
	3	N316602	0.45	-4.27	0.00
	4	N316603	0.62	-2.50	0.00
	5	N312701	0.71	-3.82	0.24
	6	N312702	0.68	-3.88	0.23
	7	N310801	0.39	-3.93	0.11
	8	N310802	0.81	-1.39	0.10
	9	N310803	0.49	-2.91	0.10
	10	N316701	0.80	-1.89	0.00
	11	N310901	0.66	-1.64	0.24
	12	N316801	0.76	-1.34	0.25
	13	N316901	0.53	-1.84	0.16
	14	N316902	1.12	1.21	0.07
	15	N317001	0.57	0.07	0.45
	16	N317101	0.95	-0.17	0.00
	17	N317102	0.93	-0.13	0.00
	18	N317103	1.16	0.26	0.00
	19	N312001	1.08	-0.70	0.20
	20	N317201	1.02	-0.74	0.14
	21	N317301	1.36	0.26	0.26
	22	N317401	0.97	0.36	0.24
	23	N317501	0.98	-0.12	0.08
	24	N317601	1.91	0.17	0.25
	25	N317701	1.34	-0.10	0.20
	26	N317801	1.36	0.27	0.16
	27	N317901	0.72	-0.87	0.23
	28	N318001	0.74	-0.89	0.21
	30	N318201	0.59	0.05	0.10
	31	N318301	0.40	1.07	0.25
	32	N318401	0.71	1.24	0.12
	33	N314001	1.46	0.55	0.36
	34	N318501	1.16	0.59	0.18
	35	N318601	1.78	0.60	0.19
	36	N318701	1.18	0.62	0.14
	37	N318801	0.80	1.12	0.00
MX51	1	N296201	0.89	-1.39	0.22
	2	N296301	0.52	-2.18	0.11
	3	N296401	0.93	0.40	0.00
	4	N296501	1.44	-0.09	0.08
	5	N287801	0.68	-3.15	0.17
	6	N287901	0.48	-3.76	0.26
	7	N288001	0.68	-1.47	0.20
	8	N288101	0.31	-3.08	0.00
	9	N288201	0.96	-1.02	0.25
	10	N296601	0.55	-0.49	0.27
	11	N296701	0.73	0.75	0.00
	12	N296801	1.37	0.93	0.43
	13	N296901	1.03	-0.94	0.00
	14	N297001	1.46	0.57	0.00
	15	N297101	1.44	0.37	0.18
	16	N297201	1.52	0.25	0.24
	17	N297301	1.88	0.82	0.16
	18	N297401	1.98	1.16	0.15
	19	N297501	1.06	0.55	0.26
	20	N297601	1.79	0.50	0.48
	21	N297701	1.24	0.37	0.11
	22	N297801	1.78	1.09	0.18
	23	N297901	1.60	1.25	0.20
MX52	1	N298001	1.61	-0.12	0.09
	2	N298101	0.84	-0.56	0.21
	3	N298201	0.99	0.24	0.00
	4	N298301	0.83	-1.11	0.49
	5	N289901	0.39	-4.97	0.00
	6	N290001	0.89	-2.18	0.24
	7	N290101	0.61	-1.27	0.00
	8	N290201	0.72	-2.56	0.12
	9	N290301	1.96	-0.33	0.15
	10	N298401	1.12	#	0.33
	11	N298501	0.77	-0.64	0.22
	12	N298601	0.80	-0.42	0.00
	13	N298701	1.09	0.31	0.25
	14	N298801	1.67	0.82	0.21
	15	N298901	1.95	1.16	0.23
	16	N299001	0.76	-0.80	0.00
	17	N299101	0.86	-2.39	0.15
	18	N299201	1.20	0.51	0.08
	19	N299301	1.73	-0.04	0.10
	21	N299501	1.83	0.94	0.23
	22	N299601	1.11	0.31	0.34
	23	N299701	1.12	-0.20	0.35

Last updated 27 July 2009 (JL)

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