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NAEP Analysis and Scaling → Estimation of NAEP Score Scales → Item Response Theory Parameters → Science Assessment Item Response Theory Parameters → IRT Parameters for Items in the Life Science Scale, by Block and Item, Grade 12 Science National Main Assessment: 2005

NAEP Technical DocumentationIRT parameters for items in the life science scale, by block and item, grade 12 science national main assessment: 2005

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2	dj3
† 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, aj represents the discriminatory power of the item, bj represents a location parameter related to item difficulty, cj represents the guessing parameter, and dji 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, dji 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), 2005 Science Assessment.
S3	6	K049504	1.22	0.35	0.00	†	†	†
	7	K049505	1.07	-0.88	0.00	†	†	†
	8	K049506	0.72	2.27	†	1.04	-1.04	†
S4	8	K092401	1.42	2.38	0.11	†	†	†
	9	K091301	1.58	0.69	0.20	†	†	†
	10	K091701	1.09	0.56	0.22	†	†	†
	11	K090801	1.08	1.01	0.34	†	†	†
	16	K090901	1.78	1.42	0.14	†	†	†
S7	3	K105201	2.92	1.83	0.21	†	†	†
	14	K104401	0.49	0.94	0.18	†	†	†
	15	K104501	0.40	1.91	†	-0.26	0.26	†
S8	1	K041301	1.10	-2.39	0.21	†	†	†
	2	K041302	0.83	-2.40	0.19	†	†	†
	3	K041303	0.73	-2.04	0.20	†	†	†
	4	K041304	0.52	-0.57	0.15	†	†	†
	5	K041305	1.36	-1.09	0.22	†	†	†
	7	K041307	0.61	0.32	0.00	†	†	†
	10	K0414CL	0.85	1.11	†	1.80	-0.77	-1.03
	11	K041404	0.48	-0.95	0.00	†	†	†
	12	K041405	0.86	0.36	0.20	†	†	†
	13	K041406	0.63	1.50	0.00	†	†	†
S10	5	K100401	0.18	-0.31	0.24	†	†	†
	6	K100501	0.94	0.68	0.21	†	†	†
	7	K100601	0.78	0.39	0.19	†	†	†
	16	K092501	1.22	2.48	0.17	†	†	†
S11	8	K047501	0.32	1.50	0.28	†	†	†
	10	K047701	0.94	1.99	0.14	†	†	†
	11	K047801	1.02	0.42	0.22	†	†	†
	13	K048001	0.95	0.24	†	1.57	-1.57	†
S12	3	K048401	0.59	-0.12	0.23	†	†	†
	8	K048901	0.60	-0.80	†	-0.08	0.08	†
S13	3	K058801	1.71	0.27	0.23	†	†	†
	7	K059401	0.73	-1.37	0.23	†	†	†
	8	K059601	0.98	0.81	0.25	†	†	†
S14	4	K052901	0.68	-0.81	†	0.34	-0.34	†
	5	K052902	0.91	-1.57	0.20	†	†	†
	11	K053601	0.54	1.06	†	2.45	-2.45	†
	12	K053701	0.50	2.04	†	0.52	-0.52	†
	13	K053901	0.76	2.30	†	0.71	-0.71	†
S15	1	K075001	1.16	1.74	0.17	†	†	†
	2	K075101	0.30	0.01	0.26	†	†	†
	4	K075301	1.11	0.43	0.27	†	†	†
	5	K075401	0.92	1.42	†	0.41	-0.41	†
	6	K075501	1.03	1.25	†	0.15	-0.15	†
	7	K075601	0.72	-1.37	0.00	†	†	†
	8	K075701	0.64	1.17	†	1.02	-1.02	†
	9	K075801	0.86	1.45	†	-0.52	0.52	†
	10	K075901	0.89	1.55	†	-0.29	0.29	†
S16	9	K092701	0.56	1.12	†	0.78	-0.78	†
	14	K049301	0.68	2.03	0.00	†	†	†
	15	K053801	0.58	0.57	†	-0.61	0.61	†
	16	K106201	0.60	0.47	0.25	†	†	†
S17	6	K100201	0.77	0.99	†	0.61	-0.61	†
	7	K100301	0.38	2.38	†	-1.16	1.16	†
S18	3	K090301	0.30	-0.46	†	1.42	-1.42	†
	5	K059201	0.71	0.82	†	0.71	0.16	-0.87
	11	K049201	0.37	-0.47	0.23	†	†	†

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