NAEP Analysis and Scaling - IRT Parameters, Age 13 Mathematics Long-Term Trend Assessment, by Item and Block: 2008

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NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Assessment IRT Parameters → Mathematics Long-Term Trend Assessment IRT Parameters → IRT Parameters, Age 13 Mathematics Long-Term Trend Assessment, by Item and Block: 2008

NAEP Technical DocumentationIRT parameters, age 13 mathematics long-term trend assessment, by item and block: 2008
Block	Item	NAEP ID	a_j	b_j	c_j
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), 2008 Mathematics Long-Term Trend Assessment.
M1	1	N299801	1.23	0.45	0.33
	2	N299901	0.52	-2.34	0.10
	3	N300001	1.21	-1.57	0.21
	4	N300101	0.42	-2.79	0.17
	5	N300201	1.24	-0.44	†
	6	N300301	1.56	-0.18	0.21
	7	N300401	0.91	0.21	†
	8	N292301	0.72	-0.93	0.31
	9	N292401	0.29	-2.87	†
	10	N292501	0.94	-0.41	0.28
	11	N292601	0.75	-1.25	0.19
	12	N300501	0.94	0.32	†
	13	N300601	0.44	-1.76	0.29
	14	N300701	1.22	-0.39	0.13
	15	N300801	1.15	-0.38	0.19
	16	N300901	1.69	-0.04	0.18
	17	N301001	0.75	1.06	0.17
	18	N301101	0.64	-0.71	0.29
	19	N301201	0.97	-0.79	0.25
	20	N301301	0.92	0.57	0.18
	21	N301401	0.71	-0.53	0.09
	22	N301501	0.80	-2.10	†
	23	N301601	0.97	0.48	0.31
M2	1	N301701	0.94	-1.38	0.25
	2	N301801	0.39	-4.76	†
	3	N301901	0.55	-1.17	0.07
	4	N302001	1.04	0.06	0.13
	5	N302101	0.81	-0.89	0.23
	6	N302201	0.80	-0.91	0.21
	7	N302301	0.54	-3.32	0.25
	8	N294601	0.66	-2.36	0.12
	9	N294701	0.39	-3.63	0.14
	10	N294801	0.72	0.16	0.13
	11	N294901	0.76	-0.91	0.34
	12	N302401	1.25	-0.48	†
	13	N302501	0.88	0.47	0.07
	14	N302601	0.90	0.38	†
	15	N302701	1.03	-0.63	0.14
	16	N302801	0.91	-0.12	0.35
	17	N302901	0.76	-1.79	†
	19	N303101	0.78	-0.30	0.24
	20	N303201	0.97	0.08	†
	21	N303301	0.98	-0.97	0.12
	22	N303401	0.96	-0.27	0.15
	23	N303501	0.35	-0.70	0.40
M3	1	N324101	0.44	-2.04	0.10
	2	N324201	0.70	-1.27	0.17
	3	N324301	0.94	0.14	†
	4	N324401	1.25	-0.09	0.21
	5	N322401	0.54	-1.53	†
	6	N322501	1.33	0.09	0.21
	7	N322601	0.47	-3.06	0.15
	8	N322602	0.89	-0.46	0.08
	9	N324501	0.67	0.33	0.16
	10	N324601	1.60	0.26	0.19
	11	N324701	1.26	0.02	0.20
	12	N324801	1.29	-0.19	0.12
	13	N324901	1.30	-0.94	0.18
	14	N325001	0.62	-0.92	†
	15	N325101	0.74	-0.89	0.23
	16	N325201	0.60	-0.39	0.25
	17	N325301	0.71	-1.65	†
	18	N325401	1.07	0.11	0.23
	19	N325501	1.57	0.57	0.12
	20	N325601	0.58	-1.30	†
	21	N325701	1.61	0.85	†
	22	N325801	1.03	-0.53	0.12
	24	N326001	0.61	-0.75	†
	25	N326101	0.86	-0.30	0.24
	26	N326201	1.12	-0.68	0.09
	27	N326301	0.99	-0.07	0.23
	28	N326401	0.36	-2.24	†
M4	1	N310501	0.65	-3.57	0.14
	2	N316601	0.52	-3.73	†
	3	N316602	0.47	-4.25	†
	4	N316603	0.60	-2.59	†
	5	N312701	0.66	-4.04	0.22
	6	N312702	0.64	-4.06	0.22
	7	N310801	0.35	-4.19	0.12
	8	N310802	0.86	-1.25	0.14
	9	N310803	0.45	-3.08	0.08
	10	N316701	0.76	-2.00	†
	11	N310901	0.65	-1.64	0.28
	12	N316801	0.77	-1.30	0.26
	13	N316901	0.60	-1.62	0.24
	14	N316902	1.08	1.11	0.06
	15	N317001	0.54	-0.14	0.41
	16	N317101	0.94	-0.23	†
	17	N317102	0.91	-0.24	†
	18	N317103	1.14	0.23	†
	19	N312001	1.08	-0.77	0.23
	20	N317201	1.04	-0.67	0.18
	21	N317301	1.26	0.24	0.25
	22	N317401	0.83	0.22	0.21
	23	N317501	0.98	-0.11	0.07
	24	N317601	1.84	0.12	0.23
	25	N317701	1.27	-0.17	0.21
	26	N317801	1.32	0.22	0.16
	27	N317901	0.82	-0.63	0.29
	28	N318001	0.71	-0.98	0.18
	30	N318201	0.57	-0.02	0.12
	31	N318301	0.39	0.91	0.24
	32	N318401	0.77	1.18	0.11
	33	N314001	1.45	0.50	0.33
	34	N318501	1.11	0.48	0.19
	35	N318601	1.68	0.54	0.21
	36	N318701	1.14	0.54	0.12
	37	N318801	0.81	1.14	†
M5	1	N296201	0.87	-1.49	0.21
	2	N296301	0.53	-2.26	0.10
	3	N296401	0.95	0.27	†
	4	N296501	1.41	-0.18	0.08
	5	N287801	0.62	-3.49	0.17
	6	N287901	0.45	-4.04	0.25
	7	N288001	0.68	-1.56	0.20
	8	N288101	0.31	-3.03	†
	9	N288201	1.04	-0.94	0.31
	10	N296601	0.58	-0.43	0.30
	11	N296701	0.76	0.56	†
	12	N296801	1.29	0.99	0.43
	13	N296901	1.04	-0.99	†
	14	N297001	1.55	0.36	†
	15	N297101	1.34	0.31	0.17
	16	N297201	1.55	0.22	0.25
	17	N297301	1.99	0.75	0.15
	18	N297401	2.16	1.08	0.15
	19	N297501	1.12	0.57	0.27
	20	N297601	1.95	0.55	0.48
	21	N297701	1.29	0.34	0.10
	22	N297801	1.77	1.04	0.17
	23	N297901	1.84	1.21	0.20
M6	1	N298001	1.52	-0.16	0.08
	2	N298101	0.81	-0.53	0.21
	3	N298201	0.94	0.09	†
	4	N298301	1.35	-0.31	0.67
	5	N289901	0.39	-4.93	†
	6	N290001	0.81	-2.32	0.25
	7	N290101	0.65	-1.14	†
	8	N290201	0.73	-2.47	0.10
	9	N290301	1.93	-0.36	0.13
	10	N298401	1.07	-0.10	0.30
	11	N298501	0.73	-0.71	0.23
	12	N298601	0.87	-0.57	†
	13	N298701	1.14	0.19	0.23
	14	N298801	1.32	0.54	0.22
	15	N298901	2.16	1.07	0.25
	16	N299001	0.73	-0.70	†
	17	N299101	0.77	-2.77	0.15
	18	N299201	1.11	0.45	0.09
	19	N299301	1.83	-0.02	0.10
	21	N299501	1.69	0.89	0.21
	22	N299601	1.06	0.25	0.33
	23	N299701	1.15	-0.18	0.36

Last updated 22 April 2010 (GF)

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