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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 Not Permitted [R2]): 2000

NAEP Technical DocumentationIRT parameters for the life science scale, by block and item, grade 12 science national main assessment (accommodations not permitted [R2]): 2000

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2	dj3
S3	6	K049504	1.16	0.44	0.00	†	†	†
	7	K049505	0.84	-0.90	0.00	†	†	†
	8	K049506	0.59	2.74	0.00	0.91	-0.91	†
S7	3	K105201	1.45	2.43	0.22	†	†	†
	12	K106201	0.74	0.30	0.27	†	†	†
	17	K104401	0.88	1.28	0.33	†	†	†
	18	K104501	0.29	2.40	0.00	-0.52	0.52	†
S8	1	K041301	0.75	-2.85	0.22	†	†	†
	2	K041302	0.85	-2.54	0.20	†	†	†
	3	K041303	0.63	-2.14	0.19	†	†	†
	4	K041304	0.39	-0.61	0.14	†	†	†
	5	K041305	1.18	-1.25	0.23	†	†	†
	7	K041307	0.51	0.26	0.00	†	†	†
	11	K041404	0.39	-1.43	0.00	†	†	†
	12	K041405	0.60	0.12	0.16	†	†	†
	13	K041406	0.44	2.01	0.00	†	†	†
	10	K0414CL	0.72	1.16	0.00	2.17	-1.07	-1.10
S10	5	K100401	0.12	-0.76	0.29	†	†	†
	6	K100501	0.80	0.97	0.25	†	†	†
	7	K100601	0.69	0.50	0.22	†	†	†
	12	K092701	0.40	1.11	0.00	0.78	-0.78	†
	17	K092501	1.40	2.23	0.20	†	†	†
	19	K090301	0.33	-0.16	0.00	1.03	-1.03	†
S11	1	K051301	1.15	0.26	0.32	†	†	†
	8	K052001	0.72	2.29	0.23	†	†	†
	9	K052101	0.80	0.43	0.20	†	†	†
	10	K052201	1.25	1.66	0.28	†	†	†
	14	K052501	0.62	-0.18	0.00	0.94	-0.94	†
	15	K052502	0.28	-1.24	0.00	1.10	-1.10	†
	16	K052503	0.25	-3.83	0.00	1.01	-1.01	†
S12	8	K047501	0.81	1.46	0.42	†	†	†
	10	K047701	1.11	1.57	0.13	†	†	†
	11	K047801	0.78	0.52	0.21	†	†	†
	13	K048001	0.93	0.13	0.00	1.67	-1.67	†
	14	K048101	0.47	1.56	0.00	1.13	-1.13	†
	15	K048102	0.43	6.72	0.00	3.48	-3.48	†
	16	K048103	0.49	-0.08	0.00	†	†	†
S13	3	K048401	0.55	-0.14	0.22	†	†	†
	8	K048901	0.55	-0.80	0.00	0.21	-0.21	†
	11	K049201	0.34	-0.22	0.28	†	†	†
	12	K049301	0.39	3.11	0.00	†	†	†
S14	4	K052901	0.62	-0.68	0.00	0.43	-0.43	†
	5	K052902	0.81	-1.49	0.24	†	†	†
	13	K053601	0.51	1.07	0.00	2.40	-2.40	†
	14	K053701	0.44	2.58	0.00	0.66	-0.66	†
	15	K053801	0.51	0.69	0.00	-1.18	1.18	†
	16	K053901	0.70	2.12	0.00	0.62	-0.62	†
S15	1	K054001	0.53	2.14	0.00	2.55	0.93	-3.48
	2	K054002	0.74	1.78	0.00	1.08	-1.08	†
	3	K054003	1.94	2.10	0.00	-0.13	0.13	†
	4	K054004	0.80	2.08	0.00	†	†	†
	5	K054005	0.44	2.33	0.00	1.14	-1.14	†
	6	K054006	0.59	2.58	0.00	†	†	†
	7	K054007	0.66	1.44	0.00	0.37	-0.37	†
	8	K054008	0.54	0.37	0.00	†	†	†
S20	8	K092401	2.43	1.76	0.11	†	†	†
	9	K091301	1.61	0.76	0.27	†	†	†
	10	K091701	1.14	0.66	0.25	†	†	†
	11	K090801	1.38	1.22	0.36	†	†	†
	12	K100201	0.74	0.97	0.00	0.74	-0.74	†
	13	K100301	0.27	2.94	0.00	-2.04	2.04	†
	20	K090901	1.85	1.39	0.14	†	†	†
S21	3	K058801	1.68	0.32	0.20	†	†	†
	7	K059201	0.71	0.96	0.00	1.00	0.09	-1.09
	9	K059401	0.74	-1.20	0.23	†	†	†
	11	K059601	1.23	0.92	0.29	†	†	†
† 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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