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NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Assessment IRT Parameters → Science Assessment IRT Parameters → IRT Parameters for the Life Science Scale, by Block and Item, Grade 12 Science National Main Assessment (Accommodations Permitted [R3]): 2000

NAEP Technical DocumentationIRT parameters for the life science scale, by block and item, grade 12 science national main assessment (accommodations permitted [R3]): 2000

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2	dj3
S3	6	K049504	1.17	0.31	0.00	†	†	†
	7	K049505	0.87	-0.90	0.00	†	†	†
	8	K049506	0.59	2.71	0.00	0.94	-0.94	†
S7	3	K105201	1.60	2.25	0.22	†	†	†
	12	K106201	0.67	0.15	0.23	†	†	†
	17	K104401	0.71	1.14	0.27	†	†	†
	18	K104501	0.29	2.35	0.00	-0.49	0.49	†
S8	1	K041301	0.83	-2.65	0.18	†	†	†
	2	K041302	0.90	-2.43	0.15	†	†	†
	3	K041303	0.67	-2.06	0.18	†	†	†
	4	K041304	0.38	-0.58	0.16	†	†	†
	5	K041305	1.15	-1.24	0.21	†	†	†
	7	K041307	0.52	0.28	0.00	†	†	†
	11	K041404	0.44	-1.31	0.00	†	†	†
	12	K041405	0.60	0.04	0.12	†	†	†
	13	K041406	0.43	2.00	0.00	†	†	†
	10	K0414CL	0.72	1.17	0.00	2.18	-1.04	-1.14
S10	5	K100401	0.12	-1.15	0.27	†	†	†
	6	K100501	0.74	0.89	0.23	†	†	†
	7	K100601	0.74	0.48	0.20	†	†	†
	12	K092701	0.38	1.12	0.00	0.78	-0.78	†
	17	K092501	1.38	2.24	0.20	†	†	†
	19	K090301	0.33	-0.18	0.00	1.06	-1.06	†
S11	1	K051301	1.29	0.32	0.34	†	†	†
	8	K052001	0.75	2.28	0.23	†	†	†
	9	K052101	0.85	0.41	0.20	†	†	†
	10	K052201	1.38	1.58	0.28	†	†	†
	14	K052501	0.66	-0.17	0.00	0.91	-0.91	†
	15	K052502	0.33	-1.06	0.00	1.01	-1.01	†
	16	K052503	0.28	-3.34	0.00	0.88	-0.88	†
S12	8	K047501	0.36	1.52	0.32	†	†	†
	10	K047701	1.18	1.53	0.12	†	†	†
	11	K047801	0.77	0.48	0.20	†	†	†
	13	K048001	0.94	0.14	0.00	1.67	-1.67	†
	14	K048101	0.44	1.67	0.00	1.21	-1.21	†
	15	K048102	0.41	7.04	0.00	3.60	-3.60	†
	16	K048103	0.48	-0.07	0.00	†	†	†
S13	3	K048401	0.53	-0.21	0.19	†	†	†
	8	K048901	0.56	-0.76	0.00	0.20	-0.20	†
	11	K049201	0.29	-0.29	0.25	†	†	†
	12	K049301	0.36	3.33	0.00	†	†	†
S14	4	K052901	0.59	-0.72	0.00	0.46	-0.46	†
	5	K052902	0.78	-1.60	0.22	†	†	†
	13	K053601	0.47	1.17	0.00	2.59	-2.59	†
	14	K053701	0.45	2.49	0.00	0.61	-0.61	†
	15	K053801	0.55	0.69	0.00	-1.11	1.11	†
	16	K053901	0.74	2.05	0.00	0.55	-0.55	†
S15	1	K054001	0.54	1.98	0.00	2.44	0.80	-3.24
	2	K054002	0.77	1.72	0.00	1.06	-1.06	†
	3	K054003	1.80	2.06	0.00	-0.18	0.18	†
	4	K054004	0.84	1.96	0.00	†	†	†
	5	K054005	0.48	2.19	0.00	1.08	-1.08	†
	6	K054006	0.55	2.70	0.00	†	†	†
	7	K054007	0.68	1.40	0.00	0.34	-0.34	†
	8	K054008	0.61	0.37	0.00	†	†	†
S20	8	K092401	2.30	1.79	0.11	†	†	†
	9	K091301	1.63	0.70	0.26	†	†	†
	10	K091701	1.14	0.62	0.24	†	†	†
	11	K090801	1.20	1.12	0.32	†	†	†
	12	K100201	0.74	0.96	0.00	0.75	-0.75	†
	13	K100301	0.26	3.02	0.00	-2.22	2.22	†
	20	K090901	1.85	1.38	0.14	†	†	†
S21	3	K058801	1.60	0.28	0.18	†	†	†
	7	K059201	0.69	0.99	0.00	1.03	0.10	-1.14
	9	K059401	0.70	-1.29	0.19	†	†	†
	11	K059601	0.98	0.86	0.25	†	†	†
† Not applicable; the number of item parameters estimated depends upon the IRT model used for scaling. 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 or the generalized partial credit model. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2000 Science Assessment.

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