Table of Contents  |  Search Technical Documentation  |  References

NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Assessment IRT Parameters → Mathematics Assessment IRT Parameters → IRT Parameters for the Algebra and Functions Scale, by Block and Item, Grade 4 Mathematics State Assessment (Accommodations Not Permitted [R2]): 2000

NAEP Technical DocumentationIRT parameters algebra and functions scale, by block and item, grade 4 mathematics state assessment (accommodations not permitted [R2]): 2000

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2	dj3	dj4
M3	8	M039701	0.91	1.04	0.16	†	†	†	†
M4	10	M018301	1.39	0.84	0.12	†	†	†	†
	14	M018701	1.48	1.93	0.17	†	†	†	†
M5	3	M066201	1.19	0.09	0.21	†	†	†	†
	4A	M066301	0.41	-0.30	0.00	-2.19	2.19	†	†
	6A	M066501	0.71	0.68	0.00	-0.36	0.36	†	†
	7A	M066601	0.69	0.75	0.00	0.24	-0.24	†	†
M6	1A	M019701	0.55	-0.46	0.00	†	†	†	†
	8A	M020401	0.57	0.05	0.00	†	†	†	†
M7	2	M067701	0.93	-0.13	0.20	†	†	†	†
	4A	M067901	0.53	0.94	0.00	-1.93	1.93	†	†
M8	4A	M010331	1.14	0.33	0.39	†	†	†	†
M9	6	M091001	0.66	-0.50	0.14	†	†	†	†
	7A	M091101	0.40	0.03	0.00	-0.23	0.23	†	†
M12	5A	M086801	0.66	-0.41	0.20	†	†	†	†
	9A	M087201	1.33	1.93	0.25	†	†	†	†
M13	12A	M043501	0.31	1.16	0.00	0.74	0.07	-0.08	†
M14	4A	M072201	0.39	-0.57	0.00	-8.13	8.13	†	†
	5A	M072202	0.88	0.67	0.00	-0.17	0.17	†	†
	10A	M072701	0.34	1.81	0.00	0.27	0.02	-0.29	†
M15	3	M074401	0.85	0.82	0.28	†	†	†	†
† 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 Mathematics Assessment.

Printer-friendly Version