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NAEP Analysis and Scaling → Estimation of Population and Student Group Distributions → Examining the Population-Structure Models Used in NAEP → Proportion of Variance of the Group-Defining Contrasts Accounted for by the Principal Components Used in NAEP Student Group Distribution Models → Proportion of Variance of the Group-Defining Contrasts Accounted for by the Principal Components Used in the Population-Structure Model, Grade 12 Reading National Main Assessment: 2002

NAEP Technical DocumentationProportion of variance of the group-defining contrasts accounted for by the principal components used in the population-structure model, grade 12 reading national main assessment: 2002

Type of contrast	Number of contrasts	Mean	Minimum	Maximum	Number of contrasts by proportion of variance explained
					0.00 - 0.70	0.70 - 0.80	0.80 - 0.90	0.90 - 0.95	0.95 - 1.00
SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2002 Reading Assessment.
All contrasts	877	0.90	0.68	0.99	1	29	401	279	167
Student questionnaire	239	0.89	0.68	0.98	1	12	113	78	35
Major reporting variables	48	0.91	0.81	0.98	0	0	21	8	19
Interactions between reporting variables	238	0.90	0.72	0.99	0	17	95	77	49
School questionnaire	352	0.91	0.80	0.99	0	0	172	116	64

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