Table of Contents  |  Search Technical Documentation  |  References

NAEP Analysis and Scaling → Estimation of NAEP Score Scales → Item Response Theory Parameters → Mathematics Assessment Item Response Theory Parameters → IRT Parameters for Items in the Data Analysis, Statistics, and Probability Scale, by Block and Item, Grade 4 Mathematics Combined National and State Main Assessment: 2005

NAEP Technical DocumentationIRT parameters for items in the data analysis, statistics, and probability scale, by block and item, grade 4 mathematics combined national and state main assessment: 2005

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2	dj3	dj4
M3	14	M047301	1.40	-0.88	0.00	†	†	†	†
M4	7	M046601	1.11	0.18	0.00	†	†	†	†
M5	10	M047001	1.85	1.14	0.22	†	†	†	†
M6	14	M136901	0.64	0.42	†	-0.10	0.10	†	†
	15	M137001	0.61	1.19	0.22	†	†	†	†
M7	7	M139401	0.62	0.69	0.10	†	†	†	†
M8	6	M072301	0.57	-1.31	0.10	†	†	†	†
	13	M040001	0.96	-0.14	0.00	†	†	†	†
M9	3	M043201	0.53	-1.57	0.00	†	†	†	†
	10	M043101	1.12	-0.02	0.22	†	†	†	†
	20	M091401	0.40	1.37	†	-2.34	2.73	0.05	-0.45
M10	4	M137501	1.35	-0.78	0.00	†	†	†	†
	5	M137601	0.96	0.27	0.34	†	†	†	†
M11	4	M096001	0.76	0.53	0.00	†	†	†	†
	6	M096301	0.99	-1.24	0.13	†	†	†	†
	16	M097401	1.07	-0.10	†	1.41	-1.41	†	†
M12	10	M100601	0.81	-1.98	0.15	†	†	†	†
	11	M100701	0.29	0.77	0.19	†	†	†	†
† Not applicable; c parameters are not estimated for generalized partial credit 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 Mathematics Assessment.

Printer-friendly Version