NAEP Analysis and Scaling - IRT Parameters for the Gathering of Interactions of Peoples, Cultures, and Ideas Scale, by Block and Item, Grade 4 U.S. History National Main Assessment (Accommodations Not Permitted [R2]): 2001

Table of Contents | Search Technical Documentation | References

NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Assessment IRT Parameters → U.S. History Assessment IRT Parameters → IRT Parameters for the Gathering of Interactions of Peoples, Cultures, and Ideas Scale, by Block and Item, Grade 4 U.S. History National Main Assessment (Accommodations Not Permitted [R2]): 2001

NAEP Technical DocumentationIRT parameters for the gathering of interactions of peoples, cultures, and ideas scale, by block and item, grade 4 U.S. history national main assessment (accommodations not permitted [R2]): 2001
Block	Item	NAEP ID	a_j	b_j	c_j	d_j1	d_j2	d_j3	d_j4	d_j5
H3	2	H028301	1.09	2.68	0.20	†	†	†	†	†
	3	H028302	1.03	-0.29	0.31	†	†	†	†	†
	4	H028401	0.44	1.01	0.31	†	†	†	†	†
	12	H029001	2.14	1.10	0.18	†	†	†	†	†
	13	H029002	0.55	0.34	0.00	0.78	-0.78	†	†	†
H4	1	H054101	1.32	1.39	0.20	†	†	†	†	†
H4	9	H054901	0.61	0.52	0.00	0.29	-0.29	†	†	†
H5	1	H055701	1.29	0.93	0.30	†	†	†	†	†
	2	H055801	0.83	0.92	0.21	†	†	†	†	†
	3	H055901	0.64	-0.08	0.00	0.61	-0.61	†	†	†
	5	H056101	1.10	0.82	0.00	-0.16	0.16	†	†	†
	8	H056401	0.59	-0.84	0.00	0.77	-0.77	†	†	†
	10	H056601	0.96	0.37	0.00	1.00	-1.00	†	†	†
	13	H056901	0.72	0.43	0.19	†	†	†	†	†
	14	H057001	1.12	0.46	0.30	†	†	†	†	†
H6	2	H031701	0.48	1.12	0.00	-0.75	2.30	-1.55	†	†
	5	H031901	0.93	1.84	0.29	†	†	†	†	†
	6	H031902	1.63	0.73	0.27	†	†	†	†	†
H7	1	H057201	0.67	0.71	0.27	†	†	†	†	†
	2	H057301	1.03	0.01	0.23	†	†	†	†	†
	6	H057701	0.56	-0.21	0.00	1.12	-1.12	†	†	†
	7	H057801	0.51	1.89	0.00	0.36	-0.36	†	†	†
	8	H057901	0.82	0.62	0.28	†	†	†	†	†
H8	2	H034201	0.96	1.37	0.32	†	†	†	†	†
	3	H034301	1.32	1.39	0.31	†	†	†	†	†
	6	H034601	0.86	0.92	0.31	†	†	†	†	†
† Not applicable; the number of item parameters estimated depends upon the IRT model used for scaling. 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, and d_ji 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), 2001 U.S. History Assessment.

Last updated 14 July 2008 (KL)

Printer-friendly Version