Table of Contents  |  Search Technical Documentation  |  References

NAEP Analysis and Scaling → Estimation of Population and Student Group Distributions → Examining the Population-Structure Models Used in NAEP → Proportion of Scale Score Variance Accounted for by the Population-Structure Models → Proportion of Scale Score Variance Accounted for by the Population-Structure Model and Grade, Mathematics National Main Assessment (Accommodations not Permitted ): 2000

NAEP Technical DocumentationProportion of scale score variance accounted for by the population-structure model and grade, mathematics national main assessment (accommodations not permitted [R2]): 2000

Grade	Number of initial group-defining contrasts2	Number of principal components2	Proportion1 of scale score variance
			Number sense properties and operations	Measurement	Geometry and spatial sense	Data analysis statistics and probability	Algebra and functions
4	1,038	381	0.66	0.69	0.67	0.73	0.64
8	1,121	421	0.65	0.67	0.62	0.69	0.68
12	1,135	369	0.71	0.75	0.76	0.71	0.78
1 Proportion is (Total Variance – Residual Variance)/Total Variance. 2 Excluding the constant term. 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